The 2dF Galaxy Redshift Survey: the power spectrum and the matter content of the Universe
Identifieur interne : 000950 ( Main/Curation ); précédent : 000949; suivant : 000951The 2dF Galaxy Redshift Survey: the power spectrum and the matter content of the Universe
Auteurs : Will J. Percival [Royaume-Uni] ; Carlton M. Baugh ; Joss Bland-Hawthorn [Australie] ; Terry Bridges [Australie] ; Russell Cannon [Australie] ; Shaun Cole ; Matthew Colless [Australie] ; Chris Collins ; Warrick Couch [Australie] ; Gavin Dalton ; Roberto De Propris [Australie] ; Simon P. Driver ; George Efstathiou ; Richard S. Ellis [États-Unis] ; Carlos S. Frenk ; Karl Glazebrook [États-Unis] ; Carole Jackson [Australie] ; Ofer Lahav ; Ian Lewis [Australie] ; Stuart Lumsden ; Steve Maddox ; Stephen Moody ; Peder Norberg ; John A. Peacock ; Bruce A. Peterson [Australie] ; Will Sutherland ; Keith Taylor [Australie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2001-11-11.
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Abstract
The 2dF Galaxy Redshift Survey has now measured in excess of 160-000 galaxy redshifts. This paper presents the power spectrum of the galaxy distribution, calculated using a direct Fourier transform based technique. We argue that, within the k-space region , the shape of this spectrum should be close to that of the linear density perturbations convolved with the window function of the survey. This window function and its convolving effect on the power spectrum estimate are analysed in detail. By convolving model spectra, we are able to fit the power-spectrum data and provide a measure of the matter content of the Universe. Our results show that models containing baryon oscillations are mildly preferred over featureless power spectra. Analysis of the data yields 68 per cent confidence limits on the total matter density times the Hubble parameter , and the baryon fraction , assuming scale-invariant primordial fluctuations.
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DOI: 10.1046/j.1365-8711.2001.04827.x
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Carlton M. Baugh<affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead, L14 1LD</mods:affiliation><wicri:noCountry code="subField">1LD</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH</mods:affiliation><wicri:noCountry code="subField">3RH</wicri:noCountry></affiliation><affiliation><mods:affiliation>School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY6 9SS</mods:affiliation><wicri:noCountry code="subField">9SS</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT</mods:affiliation><wicri:noCountry code="subField">9JT</wicri:noCountry></affiliation><affiliation><mods:affiliation>School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD</mods:affiliation><wicri:noCountry code="subField">2RD</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation>Le document en format XML
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Ellis</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy, Caltech, Pasadena, CA 91125, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, Caltech, Pasadena, CA 91125</wicri:regionArea></affiliation></author><author><name sortKey="Frenk, Carlos S" sort="Frenk, Carlos S" uniqKey="Frenk C" first="Carlos S." last="Frenk">Carlos S. Frenk</name><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Glazebrook, Karl" sort="Glazebrook, Karl" uniqKey="Glazebrook K" first="Karl" last="Glazebrook">Karl Glazebrook</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686</wicri:regionArea></affiliation></author><author><name sortKey="Jackson, Carole" sort="Jackson, Carole" uniqKey="Jackson C" first="Carole" last="Jackson">Carole Jackson</name><affiliation wicri:level="1"><mods:affiliation>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea></affiliation></author><author><name sortKey="Lahav, Ofer" sort="Lahav, Ofer" uniqKey="Lahav O" first="Ofer" last="Lahav">Ofer Lahav</name><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Lewis, Ian" sort="Lewis, Ian" uniqKey="Lewis I" first="Ian" last="Lewis">Ian Lewis</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author><author><name sortKey="Lumsden, Stuart" sort="Lumsden, Stuart" uniqKey="Lumsden S" first="Stuart" last="Lumsden">Stuart Lumsden</name><affiliation><mods:affiliation>Department of Physics, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT</mods:affiliation><wicri:noCountry code="subField">9JT</wicri:noCountry></affiliation></author><author><name sortKey="Maddox, Steve" sort="Maddox, Steve" uniqKey="Maddox S" first="Steve" last="Maddox">Steve Maddox</name><affiliation><mods:affiliation>School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD</mods:affiliation><wicri:noCountry code="subField">2RD</wicri:noCountry></affiliation></author><author><name sortKey="Moody, Stephen" sort="Moody, Stephen" uniqKey="Moody S" first="Stephen" last="Moody">Stephen Moody</name><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Norberg, Peder" sort="Norberg, Peder" uniqKey="Norberg P" first="Peder" last="Norberg">Peder Norberg</name><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Peacock, John A" sort="Peacock, John A" uniqKey="Peacock J" first="John A." last="Peacock">John A. Peacock</name><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation></author><author><name sortKey="Peterson, Bruce A" sort="Peterson, Bruce A" uniqKey="Peterson B" first="Bruce A." last="Peterson">Bruce A. Peterson</name><affiliation wicri:level="1"><mods:affiliation>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea></affiliation></author><author><name sortKey="Sutherland, Will" sort="Sutherland, Will" uniqKey="Sutherland W" first="Will" last="Sutherland">Will Sutherland</name><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation></author><author><name sortKey="Taylor, Keith" sort="Taylor, Keith" uniqKey="Taylor K" first="Keith" last="Taylor">Keith Taylor</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:D322953CA1436006D1F85A0DEBC8A038B7B7A8A4</idno><date when="2001" year="2001">2001</date><idno type="doi">10.1046/j.1365-8711.2001.04827.x</idno><idno type="url">https://api.istex.fr/document/D322953CA1436006D1F85A0DEBC8A038B7B7A8A4/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">000950</idno><idno type="wicri:Area/Main/Curation">000950</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">The 2dF Galaxy Redshift Survey: the power spectrum and the matter content of the Universe</title><author><name sortKey="Percival, Will J" sort="Percival, Will J" uniqKey="Percival W" first="Will J." last="Percival">Will J. Percival</name><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: wjp@roe.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation></author><author><name sortKey="Baugh, Carlton M" sort="Baugh, Carlton M" uniqKey="Baugh C" first="Carlton M." last="Baugh">Carlton M. Baugh</name><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Bland Hawthorn, Joss" sort="Bland Hawthorn, Joss" uniqKey="Bland Hawthorn J" first="Joss" last="Bland-Hawthorn">Joss Bland-Hawthorn</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author><author><name sortKey="Bridges, Terry" sort="Bridges, Terry" uniqKey="Bridges T" first="Terry" last="Bridges">Terry Bridges</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author><author><name sortKey="Cannon, Russell" sort="Cannon, Russell" uniqKey="Cannon R" first="Russell" last="Cannon">Russell Cannon</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author><author><name sortKey="Cole, Shaun" sort="Cole, Shaun" uniqKey="Cole S" first="Shaun" last="Cole">Shaun Cole</name><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Colless, Matthew" sort="Colless, Matthew" uniqKey="Colless M" first="Matthew" last="Colless">Matthew Colless</name><affiliation wicri:level="1"><mods:affiliation>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea></affiliation></author><author><name sortKey="Collins, Chris" sort="Collins, Chris" uniqKey="Collins C" first="Chris" last="Collins">Chris Collins</name><affiliation><mods:affiliation>Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead, L14 1LD</mods:affiliation><wicri:noCountry code="subField">1LD</wicri:noCountry></affiliation></author><author><name sortKey="Couch, Warrick" sort="Couch, Warrick" uniqKey="Couch W" first="Warrick" last="Couch">Warrick Couch</name><affiliation wicri:level="1"><mods:affiliation>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052</wicri:regionArea></affiliation></author><author><name sortKey="Dalton, Gavin" sort="Dalton, Gavin" uniqKey="Dalton G" first="Gavin" last="Dalton">Gavin Dalton</name><affiliation><mods:affiliation>Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH</mods:affiliation><wicri:noCountry code="subField">3RH</wicri:noCountry></affiliation></author><author><name sortKey="De Propris, Roberto" sort="De Propris, Roberto" uniqKey="De Propris R" first="Roberto" last="De Propris">Roberto De Propris</name><affiliation wicri:level="1"><mods:affiliation>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Astrophysics, University of New South Wales, Sydney, NSW 2052</wicri:regionArea></affiliation></author><author><name sortKey="Driver, Simon P" sort="Driver, Simon P" uniqKey="Driver S" first="Simon P." last="Driver">Simon P. Driver</name><affiliation><mods:affiliation>School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY6 9SS</mods:affiliation><wicri:noCountry code="subField">9SS</wicri:noCountry></affiliation></author><author><name sortKey="Efstathiou, George" sort="Efstathiou, George" uniqKey="Efstathiou G" first="George" last="Efstathiou">George Efstathiou</name><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Ellis, Richard S" sort="Ellis, Richard S" uniqKey="Ellis R" first="Richard S." last="Ellis">Richard S. Ellis</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy, Caltech, Pasadena, CA 91125, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, Caltech, Pasadena, CA 91125</wicri:regionArea></affiliation></author><author><name sortKey="Frenk, Carlos S" sort="Frenk, Carlos S" uniqKey="Frenk C" first="Carlos S." last="Frenk">Carlos S. Frenk</name><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Glazebrook, Karl" sort="Glazebrook, Karl" uniqKey="Glazebrook K" first="Karl" last="Glazebrook">Karl Glazebrook</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics & Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686</wicri:regionArea></affiliation></author><author><name sortKey="Jackson, Carole" sort="Jackson, Carole" uniqKey="Jackson C" first="Carole" last="Jackson">Carole Jackson</name><affiliation wicri:level="1"><mods:affiliation>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea></affiliation></author><author><name sortKey="Lahav, Ofer" sort="Lahav, Ofer" uniqKey="Lahav O" first="Ofer" last="Lahav">Ofer Lahav</name><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Lewis, Ian" sort="Lewis, Ian" uniqKey="Lewis I" first="Ian" last="Lewis">Ian Lewis</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author><author><name sortKey="Lumsden, Stuart" sort="Lumsden, Stuart" uniqKey="Lumsden S" first="Stuart" last="Lumsden">Stuart Lumsden</name><affiliation><mods:affiliation>Department of Physics, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT</mods:affiliation><wicri:noCountry code="subField">9JT</wicri:noCountry></affiliation></author><author><name sortKey="Maddox, Steve" sort="Maddox, Steve" uniqKey="Maddox S" first="Steve" last="Maddox">Steve Maddox</name><affiliation><mods:affiliation>School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD</mods:affiliation><wicri:noCountry code="subField">2RD</wicri:noCountry></affiliation></author><author><name sortKey="Moody, Stephen" sort="Moody, Stephen" uniqKey="Moody S" first="Stephen" last="Moody">Stephen Moody</name><affiliation><mods:affiliation>Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA</mods:affiliation><wicri:noCountry code="subField">0HA</wicri:noCountry></affiliation></author><author><name sortKey="Norberg, Peder" sort="Norberg, Peder" uniqKey="Norberg P" first="Peder" last="Norberg">Peder Norberg</name><affiliation><mods:affiliation>Department of Physics, University of Durham, South Road, Durham DH1 3LE</mods:affiliation><wicri:noCountry code="subField">3LE</wicri:noCountry></affiliation></author><author><name sortKey="Peacock, John A" sort="Peacock, John A" uniqKey="Peacock J" first="John A." last="Peacock">John A. Peacock</name><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation></author><author><name sortKey="Peterson, Bruce A" sort="Peterson, Bruce A" uniqKey="Peterson B" first="Bruce A." last="Peterson">Bruce A. Peterson</name><affiliation wicri:level="1"><mods:affiliation>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Research School of Astronomy & Astrophysics, The Australian National University, Weston Creek, ACT 2611</wicri:regionArea></affiliation></author><author><name sortKey="Sutherland, Will" sort="Sutherland, Will" uniqKey="Sutherland W" first="Will" last="Sutherland">Will Sutherland</name><affiliation><mods:affiliation>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ</mods:affiliation><wicri:noCountry code="subField">3HJ</wicri:noCountry></affiliation></author><author><name sortKey="Taylor, Keith" sort="Taylor, Keith" uniqKey="Taylor K" first="Keith" last="Taylor">Keith Taylor</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, P. O. Box 296, Epping, NSW 2121</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2001-11-11">2001-11-11</date><biblScope unit="volume">327</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="1297">1297</biblScope><biblScope unit="page" to="1306">1306</biblScope></imprint><idno type="ISSN">0035-8711</idno></series><idno type="istex">D322953CA1436006D1F85A0DEBC8A038B7B7A8A4</idno><idno type="DOI">10.1046/j.1365-8711.2001.04827.x</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>cosmological parameters</term><term>large-scale structure of Universe</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">The 2dF Galaxy Redshift Survey has now measured in excess of 160-000 galaxy redshifts. This paper presents the power spectrum of the galaxy distribution, calculated using a direct Fourier transform based technique. We argue that, within the k-space region , the shape of this spectrum should be close to that of the linear density perturbations convolved with the window function of the survey. This window function and its convolving effect on the power spectrum estimate are analysed in detail. By convolving model spectra, we are able to fit the power-spectrum data and provide a measure of the matter content of the Universe. Our results show that models containing baryon oscillations are mildly preferred over featureless power spectra. Analysis of the data yields 68 per cent confidence limits on the total matter density times the Hubble parameter , and the baryon fraction , assuming scale-invariant primordial fluctuations.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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