Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background.
Identifieur interne : 002B85 ( PubMed/Corpus ); précédent : 002B84; suivant : 002B86Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background.
Auteurs : S R Taylor ; C M F. Mingarelli ; J R Gair ; A. Sesana ; G. Theureau ; S. Babak ; C G Bassa ; P. Brem ; M. Burgay ; R N Caballero ; D J Champion ; I. Cognard ; G. Desvignes ; L. Guillemot ; J W T. Hessels ; G H Janssen ; R. Karuppusamy ; M. Kramer ; A. Lassus ; P. Lazarus ; L. Lentati ; K. Liu ; S. Osłowski ; D. Perrodin ; A. Petiteau ; A. Possenti ; M B Purver ; P A Rosado ; S A Sanidas ; R. Smits ; B. Stappers ; C. Tiburzi ; R. Van Haasteren ; A. Vecchio ; J P W. VerbiestSource :
- Physical review letters [ 1079-7114 ] ; 2015.
Abstract
The paucity of observed supermassive black hole binaries (SMBHBs) may imply that the gravitational wave background (GWB) from this population is anisotropic, rendering existing analyses suboptimal. We present the first constraints on the angular distribution of a nanohertz stochastic GWB from circular, inspiral-driven SMBHBs using the 2015 European Pulsar Timing Array data. Our analysis of the GWB in the ~2-90 nHz band shows consistency with isotropy, with the strain amplitude in l>0 spherical harmonic multipoles ≲40% of the monopole value. We expect that these more general techniques will become standard tools to probe the angular distribution of source populations.
DOI: 10.1103/PhysRevLett.115.041101
PubMed: 26252674
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background.</title><author><name sortKey="Taylor, S R" sort="Taylor, S R" uniqKey="Taylor S" first="S R" last="Taylor">S R Taylor</name><affiliation><nlm:affiliation>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Mingarelli, C M F" sort="Mingarelli, C M F" uniqKey="Mingarelli C" first="C M F" last="Mingarelli">C M F. Mingarelli</name><affiliation><nlm:affiliation>TAPIR (Theoretical Astrophysics), California Institute of Technology, MC 350-17, Pasadena, California 91125, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Gair, J R" sort="Gair, J R" uniqKey="Gair J" first="J R" last="Gair">J R Gair</name><affiliation><nlm:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Sesana, A" sort="Sesana, A" uniqKey="Sesana A" first="A" last="Sesana">A. Sesana</name><affiliation><nlm:affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Theureau, G" sort="Theureau, G" uniqKey="Theureau G" first="G" last="Theureau">G. Theureau</name><affiliation><nlm:affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</nlm:affiliation></affiliation></author><author><name sortKey="Babak, S" sort="Babak, S" uniqKey="Babak S" first="S" last="Babak">S. Babak</name><affiliation><nlm:affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Bassa, C G" sort="Bassa, C G" uniqKey="Bassa C" first="C G" last="Bassa">C G Bassa</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Brem, P" sort="Brem, P" uniqKey="Brem P" first="P" last="Brem">P. Brem</name><affiliation><nlm:affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Burgay, M" sort="Burgay, M" uniqKey="Burgay M" first="M" last="Burgay">M. Burgay</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Caballero, R N" sort="Caballero, R N" uniqKey="Caballero R" first="R N" last="Caballero">R N Caballero</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Champion, D J" sort="Champion, D J" uniqKey="Champion D" first="D J" last="Champion">D J Champion</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Cognard, I" sort="Cognard, I" uniqKey="Cognard I" first="I" last="Cognard">I. Cognard</name><affiliation><nlm:affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</nlm:affiliation></affiliation></author><author><name sortKey="Desvignes, G" sort="Desvignes, G" uniqKey="Desvignes G" first="G" last="Desvignes">G. Desvignes</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Guillemot, L" sort="Guillemot, L" uniqKey="Guillemot L" first="L" last="Guillemot">L. Guillemot</name><affiliation><nlm:affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</nlm:affiliation></affiliation></author><author><name sortKey="Hessels, J W T" sort="Hessels, J W T" uniqKey="Hessels J" first="J W T" last="Hessels">J W T. Hessels</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Janssen, G H" sort="Janssen, G H" uniqKey="Janssen G" first="G H" last="Janssen">G H Janssen</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Karuppusamy, R" sort="Karuppusamy, R" uniqKey="Karuppusamy R" first="R" last="Karuppusamy">R. Karuppusamy</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Kramer, M" sort="Kramer, M" uniqKey="Kramer M" first="M" last="Kramer">M. Kramer</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Lassus, A" sort="Lassus, A" uniqKey="Lassus A" first="A" last="Lassus">A. Lassus</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Lazarus, P" sort="Lazarus, P" uniqKey="Lazarus P" first="P" last="Lazarus">P. Lazarus</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Lentati, L" sort="Lentati, L" uniqKey="Lentati L" first="L" last="Lentati">L. Lentati</name><affiliation><nlm:affiliation>Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Liu, K" sort="Liu, K" uniqKey="Liu K" first="K" last="Liu">K. Liu</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Oslowski, S" sort="Oslowski, S" uniqKey="Oslowski S" first="S" last="Osłowski">S. Osłowski</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Perrodin, D" sort="Perrodin, D" uniqKey="Perrodin D" first="D" last="Perrodin">D. Perrodin</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Petiteau, A" sort="Petiteau, A" uniqKey="Petiteau A" first="A" last="Petiteau">A. Petiteau</name><affiliation><nlm:affiliation>Université Paris-Diderot-Paris7, APC-UFR de Physique, Batiment Condorcet, 10 rue Alice Domont et Léonie Duquet, 75205 Paris Cedex 13, France.</nlm:affiliation></affiliation></author><author><name sortKey="Possenti, A" sort="Possenti, A" uniqKey="Possenti A" first="A" last="Possenti">A. Possenti</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Purver, M B" sort="Purver, M B" uniqKey="Purver M" first="M B" last="Purver">M B Purver</name><affiliation><nlm:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Rosado, P A" sort="Rosado, P A" uniqKey="Rosado P" first="P A" last="Rosado">P A Rosado</name><affiliation><nlm:affiliation>Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn VIC 3122, Australia.</nlm:affiliation></affiliation></author><author><name sortKey="Sanidas, S A" sort="Sanidas, S A" uniqKey="Sanidas S" first="S A" last="Sanidas">S A Sanidas</name><affiliation><nlm:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Smits, R" sort="Smits, R" uniqKey="Smits R" first="R" last="Smits">R. Smits</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Stappers, B" sort="Stappers, B" uniqKey="Stappers B" first="B" last="Stappers">B. Stappers</name><affiliation><nlm:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Tiburzi, C" sort="Tiburzi, C" uniqKey="Tiburzi C" first="C" last="Tiburzi">C. Tiburzi</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Van Haasteren, R" sort="Van Haasteren, R" uniqKey="Van Haasteren R" first="R" last="Van Haasteren">R. Van Haasteren</name><affiliation><nlm:affiliation>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Vecchio, A" sort="Vecchio, A" uniqKey="Vecchio A" first="A" last="Vecchio">A. Vecchio</name><affiliation><nlm:affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Verbiest, J P W" sort="Verbiest, J P W" uniqKey="Verbiest J" first="J P W" last="Verbiest">J P W. Verbiest</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2015">2015</date><idno type="RBID">pubmed:26252674</idno><idno type="pmid">26252674</idno><idno type="doi">10.1103/PhysRevLett.115.041101</idno><idno type="wicri:Area/PubMed/Corpus">002B85</idno><idno type="wicri:explorRef" wicri:stream="PubMed" wicri:step="Corpus" wicri:corpus="PubMed">002B85</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background.</title><author><name sortKey="Taylor, S R" sort="Taylor, S R" uniqKey="Taylor S" first="S R" last="Taylor">S R Taylor</name><affiliation><nlm:affiliation>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Mingarelli, C M F" sort="Mingarelli, C M F" uniqKey="Mingarelli C" first="C M F" last="Mingarelli">C M F. Mingarelli</name><affiliation><nlm:affiliation>TAPIR (Theoretical Astrophysics), California Institute of Technology, MC 350-17, Pasadena, California 91125, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Gair, J R" sort="Gair, J R" uniqKey="Gair J" first="J R" last="Gair">J R Gair</name><affiliation><nlm:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Sesana, A" sort="Sesana, A" uniqKey="Sesana A" first="A" last="Sesana">A. Sesana</name><affiliation><nlm:affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Theureau, G" sort="Theureau, G" uniqKey="Theureau G" first="G" last="Theureau">G. Theureau</name><affiliation><nlm:affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</nlm:affiliation></affiliation></author><author><name sortKey="Babak, S" sort="Babak, S" uniqKey="Babak S" first="S" last="Babak">S. Babak</name><affiliation><nlm:affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Bassa, C G" sort="Bassa, C G" uniqKey="Bassa C" first="C G" last="Bassa">C G Bassa</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Brem, P" sort="Brem, P" uniqKey="Brem P" first="P" last="Brem">P. Brem</name><affiliation><nlm:affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Burgay, M" sort="Burgay, M" uniqKey="Burgay M" first="M" last="Burgay">M. Burgay</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Caballero, R N" sort="Caballero, R N" uniqKey="Caballero R" first="R N" last="Caballero">R N Caballero</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Champion, D J" sort="Champion, D J" uniqKey="Champion D" first="D J" last="Champion">D J Champion</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Cognard, I" sort="Cognard, I" uniqKey="Cognard I" first="I" last="Cognard">I. Cognard</name><affiliation><nlm:affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</nlm:affiliation></affiliation></author><author><name sortKey="Desvignes, G" sort="Desvignes, G" uniqKey="Desvignes G" first="G" last="Desvignes">G. Desvignes</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Guillemot, L" sort="Guillemot, L" uniqKey="Guillemot L" first="L" last="Guillemot">L. Guillemot</name><affiliation><nlm:affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</nlm:affiliation></affiliation></author><author><name sortKey="Hessels, J W T" sort="Hessels, J W T" uniqKey="Hessels J" first="J W T" last="Hessels">J W T. Hessels</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Janssen, G H" sort="Janssen, G H" uniqKey="Janssen G" first="G H" last="Janssen">G H Janssen</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Karuppusamy, R" sort="Karuppusamy, R" uniqKey="Karuppusamy R" first="R" last="Karuppusamy">R. Karuppusamy</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Kramer, M" sort="Kramer, M" uniqKey="Kramer M" first="M" last="Kramer">M. Kramer</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Lassus, A" sort="Lassus, A" uniqKey="Lassus A" first="A" last="Lassus">A. Lassus</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Lazarus, P" sort="Lazarus, P" uniqKey="Lazarus P" first="P" last="Lazarus">P. Lazarus</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Lentati, L" sort="Lentati, L" uniqKey="Lentati L" first="L" last="Lentati">L. Lentati</name><affiliation><nlm:affiliation>Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Liu, K" sort="Liu, K" uniqKey="Liu K" first="K" last="Liu">K. Liu</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Oslowski, S" sort="Oslowski, S" uniqKey="Oslowski S" first="S" last="Osłowski">S. Osłowski</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author><author><name sortKey="Perrodin, D" sort="Perrodin, D" uniqKey="Perrodin D" first="D" last="Perrodin">D. Perrodin</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Petiteau, A" sort="Petiteau, A" uniqKey="Petiteau A" first="A" last="Petiteau">A. Petiteau</name><affiliation><nlm:affiliation>Université Paris-Diderot-Paris7, APC-UFR de Physique, Batiment Condorcet, 10 rue Alice Domont et Léonie Duquet, 75205 Paris Cedex 13, France.</nlm:affiliation></affiliation></author><author><name sortKey="Possenti, A" sort="Possenti, A" uniqKey="Possenti A" first="A" last="Possenti">A. Possenti</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Purver, M B" sort="Purver, M B" uniqKey="Purver M" first="M B" last="Purver">M B Purver</name><affiliation><nlm:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Rosado, P A" sort="Rosado, P A" uniqKey="Rosado P" first="P A" last="Rosado">P A Rosado</name><affiliation><nlm:affiliation>Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn VIC 3122, Australia.</nlm:affiliation></affiliation></author><author><name sortKey="Sanidas, S A" sort="Sanidas, S A" uniqKey="Sanidas S" first="S A" last="Sanidas">S A Sanidas</name><affiliation><nlm:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Smits, R" sort="Smits, R" uniqKey="Smits R" first="R" last="Smits">R. Smits</name><affiliation><nlm:affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</nlm:affiliation></affiliation></author><author><name sortKey="Stappers, B" sort="Stappers, B" uniqKey="Stappers B" first="B" last="Stappers">B. Stappers</name><affiliation><nlm:affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Tiburzi, C" sort="Tiburzi, C" uniqKey="Tiburzi C" first="C" last="Tiburzi">C. Tiburzi</name><affiliation><nlm:affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</nlm:affiliation></affiliation></author><author><name sortKey="Van Haasteren, R" sort="Van Haasteren, R" uniqKey="Van Haasteren R" first="R" last="Van Haasteren">R. Van Haasteren</name><affiliation><nlm:affiliation>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.</nlm:affiliation></affiliation></author><author><name sortKey="Vecchio, A" sort="Vecchio, A" uniqKey="Vecchio A" first="A" last="Vecchio">A. Vecchio</name><affiliation><nlm:affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</nlm:affiliation></affiliation></author><author><name sortKey="Verbiest, J P W" sort="Verbiest, J P W" uniqKey="Verbiest J" first="J P W" last="Verbiest">J P W. Verbiest</name><affiliation><nlm:affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</nlm:affiliation></affiliation></author></analytic><series><title level="j">Physical review letters</title><idno type="eISSN">1079-7114</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The paucity of observed supermassive black hole binaries (SMBHBs) may imply that the gravitational wave background (GWB) from this population is anisotropic, rendering existing analyses suboptimal. We present the first constraints on the angular distribution of a nanohertz stochastic GWB from circular, inspiral-driven SMBHBs using the 2015 European Pulsar Timing Array data. Our analysis of the GWB in the ~2-90 nHz band shows consistency with isotropy, with the strain amplitude in l>0 spherical harmonic multipoles ≲40% of the monopole value. We expect that these more general techniques will become standard tools to probe the angular distribution of source populations.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">26252674</PMID><DateCreated><Year>2015</Year><Month>08</Month><Day>08</Day></DateCreated><DateCompleted><Year>2015</Year><Month>10</Month><Day>20</Day></DateCompleted><DateRevised><Year>2015</Year><Month>08</Month><Day>08</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1079-7114</ISSN><JournalIssue CitedMedium="Internet"><Volume>115</Volume><Issue>4</Issue><PubDate><Year>2015</Year><Month>Jul</Month><Day>24</Day></PubDate></JournalIssue><Title>Physical review letters</Title><ISOAbbreviation>Phys. Rev. Lett.</ISOAbbreviation></Journal><ArticleTitle>Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background.</ArticleTitle><Pagination><MedlinePgn>041101</MedlinePgn></Pagination><Abstract><AbstractText>The paucity of observed supermassive black hole binaries (SMBHBs) may imply that the gravitational wave background (GWB) from this population is anisotropic, rendering existing analyses suboptimal. We present the first constraints on the angular distribution of a nanohertz stochastic GWB from circular, inspiral-driven SMBHBs using the 2015 European Pulsar Timing Array data. Our analysis of the GWB in the ~2-90 nHz band shows consistency with isotropy, with the strain amplitude in l>0 spherical harmonic multipoles ≲40% of the monopole value. We expect that these more general techniques will become standard tools to probe the angular distribution of source populations.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Taylor</LastName><ForeName>S R</ForeName><Initials>SR</Initials><AffiliationInfo><Affiliation>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Mingarelli</LastName><ForeName>C M F</ForeName><Initials>CM</Initials><AffiliationInfo><Affiliation>TAPIR (Theoretical Astrophysics), California Institute of Technology, MC 350-17, Pasadena, California 91125, USA.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Gair</LastName><ForeName>J R</ForeName><Initials>JR</Initials><AffiliationInfo><Affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Sesana</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Theureau</LastName><ForeName>G</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Station de radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, F-18330 Nançay, France.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Laboratoire Univers et Théories LUTh, Observatoire de Paris, CNRS/INSU, Université Paris Diderot, 5 place Jules Janssen, 92190 Meudon, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Babak</LastName><ForeName>S</ForeName><Initials>S</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Bassa</LastName><ForeName>C G</ForeName><Initials>CG</Initials><AffiliationInfo><Affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Brem</LastName><ForeName>P</ForeName><Initials>P</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Gravitationsphysik, Albert Einstein Institut, Am Mühlenberg 1, 14476 Golm, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Burgay</LastName><ForeName>M</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Caballero</LastName><ForeName>R N</ForeName><Initials>RN</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Champion</LastName><ForeName>D J</ForeName><Initials>DJ</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Cognard</LastName><ForeName>I</ForeName><Initials>I</Initials><AffiliationInfo><Affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Station de radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, F-18330 Nançay, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Desvignes</LastName><ForeName>G</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Guillemot</LastName><ForeName>L</ForeName><Initials>L</Initials><AffiliationInfo><Affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Station de radioastronomie de Nançay, Observatoire de Paris, CNRS/INSU, F-18330 Nançay, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hessels</LastName><ForeName>J W T</ForeName><Initials>JW</Initials><AffiliationInfo><Affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Janssen</LastName><ForeName>G H</ForeName><Initials>GH</Initials><AffiliationInfo><Affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Karuppusamy</LastName><ForeName>R</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Kramer</LastName><ForeName>M</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lassus</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Laboratoire de Physique et Chimie de l'Environnement et de l'Espace LPC2E CNRS-Université d'Orléans, F-45071 Orléans, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lazarus</LastName><ForeName>P</ForeName><Initials>P</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Lentati</LastName><ForeName>L</ForeName><Initials>L</Initials><AffiliationInfo><Affiliation>Astrophysics Group, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Liu</LastName><ForeName>K</ForeName><Initials>K</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Osłowski</LastName><ForeName>S</ForeName><Initials>S</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Perrodin</LastName><ForeName>D</ForeName><Initials>D</Initials><AffiliationInfo><Affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Petiteau</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>Université Paris-Diderot-Paris7, APC-UFR de Physique, Batiment Condorcet, 10 rue Alice Domont et Léonie Duquet, 75205 Paris Cedex 13, France.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Possenti</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Purver</LastName><ForeName>M B</ForeName><Initials>MB</Initials><AffiliationInfo><Affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Rosado</LastName><ForeName>P A</ForeName><Initials>PA</Initials><AffiliationInfo><Affiliation>Centre for Astrophysics and Supercomputing, Swinburne University of Technology, P.O. Box 218, Hawthorn VIC 3122, Australia.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Max Planck Institute for Gravitational Physics, Albert Einstein Institute, Callinstraße 38, 30167 Hanover, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Sanidas</LastName><ForeName>S A</ForeName><Initials>SA</Initials><AffiliationInfo><Affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Anton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Smits</LastName><ForeName>R</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>ASTRON, the Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo, Netherlands.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Stappers</LastName><ForeName>B</ForeName><Initials>B</Initials><AffiliationInfo><Affiliation>Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Tiburzi</LastName><ForeName>C</ForeName><Initials>C</Initials><AffiliationInfo><Affiliation>INAF-Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047 Selargius, CA, Italy.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Dipartimento di Fisica-Universitá di Cagliari, Cittadella Universitaria, I-09042 Monserrato, CA, Italy.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>van Haasteren</LastName><ForeName>R</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Vecchio</LastName><ForeName>A</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Verbiest</LastName><ForeName>J P W</ForeName><Initials>JP</Initials><AffiliationInfo><Affiliation>Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany.</Affiliation></AffiliationInfo><AffiliationInfo><Affiliation>Fakultät für Physik, Universität Bielefeld, Postfach 100131, 33501 Bielefeld, Germany.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><CollectiveName>EPTA Collaboration</CollectiveName></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2015</Year><Month>07</Month><Day>22</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Phys Rev Lett</MedlineTA><NlmUniqueID>0401141</NlmUniqueID><ISSNLinking>0031-9007</ISSNLinking></MedlineJournalInfo></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2015</Year><Month>05</Month><Day>21</Day></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2015</Year><Month>8</Month><Day>8</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="pubmed"><Year>2015</Year><Month>8</Month><Day>8</Day><Hour>6</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2015</Year><Month>8</Month><Day>8</Day><Hour>6</Hour><Minute>1</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">26252674</ArticleId><ArticleId IdType="doi">10.1103/PhysRevLett.115.041101</ArticleId></ArticleIdList></PubmedData></pubmed></record>Pour manipuler ce document sous Unix (Dilib)
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