The dependence of Type Ia Supernovae luminosities on their host galaxies
Identifieur interne : 002784 ( Istex/Curation ); précédent : 002783; suivant : 002785The dependence of Type Ia Supernovae luminosities on their host galaxies
Auteurs : M. Sullivan [Royaume-Uni] ; A. Conley [États-Unis] ; D. A. Howell [États-Unis] ; J. D. Neill [États-Unis] ; P. Astier [France] ; C. Balland [France] ; S. Basa [France] ; R. G. Carlberg [Canada] ; D. Fouchez [France] ; J. Guy [France] ; D. Hardin [France] ; I. M. Hook [Royaume-Uni, Italie] ; R. Pain [France] ; N. Palanque-Delabrouille [France] ; K. M. Perrett [Canada] ; C. J. Pritchet [Canada] ; N. Regnault [France] ; J. Rich [France] ; V. Ruhlmann-Kleider [France] ; S. Baumont [France] ; E. Hsiao [États-Unis] ; T. Kronborg [France] ; C. Lidman [Australie] ; S. Perlmutter [États-Unis] ; E. S. Walker [Royaume-Uni, Italie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2010-08-01.
Abstract
Precision cosmology with Type Ia supernovae (SNe Ia) makes use of the fact that SN Ia luminosities depend on their light-curve shapes and colours. Using Supernova Legacy Survey (SNLS) and other data, we show that there is an additional dependence on the global characteristics of their host galaxies: events of the same light-curve shape and colour are, on average, 0.08 mag (≃4.0σ) brighter in massive host galaxies (presumably metal-rich) and galaxies with low specific star formation rates (sSFR). These trends do not depend on any assumed cosmological model, and are independent of the SN light-curve width: both fast and slow-declining events show the same trends. SNe Ia in galaxies with a low sSFR also have a smaller slope (‘β’) between their luminosities and colours with ∼2.7σ significance, and a smaller scatter on SN Ia Hubble diagrams (at 95 per cent confidence), though the significance of these effects is dependent on the reddest SNe. SN Ia colours are similar between low-mass and high-mass hosts, leading us to interpret their luminosity differences as an intrinsic property of the SNe and not of some external factor such as dust. If the host stellar mass is interpreted as a metallicity indicator using galaxy mass–metallicity relations, the luminosity trends are in qualitative agreement with theoretical predictions. We show that the average stellar mass, and therefore the average metallicity, of our SN Ia host galaxies decreases with redshift. The SN Ia luminosity differences consequently introduce a systematic error in cosmological analyses, comparable to the current statistical uncertainties on parameters such as w, the equation of state of dark energy. We show that the use of two SN Ia absolute magnitudes, one for events in high-mass (metal-rich) galaxies and the other for events in low-mass (metal-poor) galaxies, adequately corrects for the differences. Cosmological fits incorporating these terms give a significant reduction in χ2 (3.8σ–4.5σ); linear corrections based on host parameters do not perform as well. We conclude that all future SN Ia cosmological analyses should use a correction of this (or similar) form to control demographic shifts in the underlying galaxy population.
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DOI: 10.1111/j.1365-2966.2010.16731.x
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M. Sullivan<affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: sullivan@astro.ox.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation>Le document en format XML
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Hsiao</name><affiliation wicri:level="1"><mods:affiliation>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720</wicri:regionArea></affiliation></author><author><name sortKey="Kronborg, T" sort="Kronborg, T" uniqKey="Kronborg T" first="T." last="Kronborg">T. 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Perlmutter</name><affiliation wicri:level="1"><mods:affiliation>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Department of Physics, University of California, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, University of California, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300</wicri:regionArea></affiliation></author><author><name sortKey="Walker, E S" sort="Walker, E S" uniqKey="Walker E" first="E. S." last="Walker">E. S. Walker</name><affiliation wicri:level="4"><mods:affiliation>Department of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford OX1 3RH</mods:affiliation><orgName type="university">Université d'Oxford</orgName><country>Royaume-Uni</country><placeName><settlement type="city">Oxford</settlement><region type="nation">Angleterre</region><region type="région" nuts="1">Oxfordshire</region></placeName></affiliation><affiliation wicri:level="1"><mods:affiliation>Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:D5406843A707D1149672F8AFD641895AA0C8BEE0</idno><date when="2010" year="2010">2010</date><idno type="doi">10.1111/j.1365-2966.2010.16731.x</idno><idno type="url">https://api.istex.fr/document/D5406843A707D1149672F8AFD641895AA0C8BEE0/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">002784</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">002784</idno><idno type="wicri:Area/Istex/Curation">002784</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">The dependence of Type Ia Supernovae luminosities on their host galaxies</title><author><name sortKey="Sullivan, M" sort="Sullivan, M" uniqKey="Sullivan M" first="M." last="Sullivan">M. Sullivan</name><affiliation wicri:level="4"><mods:affiliation>Department of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford OX1 3RH</mods:affiliation><orgName type="university">Université d'Oxford</orgName><country>Royaume-Uni</country><placeName><settlement type="city">Oxford</settlement><region type="nation">Angleterre</region><region type="région" nuts="1">Oxfordshire</region></placeName></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: sullivan@astro.ox.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation><affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: sullivan@astro.ox.ac.uk</mods:affiliation><country wicri:rule="url">Royaume-Uni</country></affiliation></author><author><name sortKey="Conley, A" sort="Conley, A" uniqKey="Conley A" first="A." last="Conley">A. Conley</name><affiliation wicri:level="1"><mods:affiliation>Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0391, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0391</wicri:regionArea></affiliation></author><author><name sortKey="Howell, D A" sort="Howell, D A" uniqKey="Howell D" first="D. A." last="Howell">D. A. Howell</name><affiliation wicri:level="1"><mods:affiliation>Las Cumbres Observatory Global Telescope Network, 6740 Cortona Dr., Suite 102, Goleta, CA 93117, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Las Cumbres Observatory Global Telescope Network, 6740 Cortona Dr., Suite 102, Goleta, CA 93117</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Department of Physics, University of California, Santa Barbara, Broida Hall, Mail Code 9530, Santa Barbara, CA 93106-9530, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, University of California, Santa Barbara, Broida Hall, Mail Code 9530, Santa Barbara, CA 93106-9530</wicri:regionArea></affiliation></author><author><name sortKey="Neill, J D" sort="Neill, J D" uniqKey="Neill J" first="J. D." last="Neill">J. D. Neill</name><affiliation wicri:level="1"><mods:affiliation>California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125</wicri:regionArea></affiliation></author><author><name sortKey="Astier, P" sort="Astier, P" uniqKey="Astier P" first="P." last="Astier">P. Astier</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Balland, C" sort="Balland, C" uniqKey="Balland C" first="C." last="Balland">C. Balland</name><affiliation wicri:level="1"><mods:affiliation>University Paris 11, Orsay, F-91405, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>University Paris 11, Orsay, F-91405</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>LAM, Pole de l'Etoile Site de Chateau-Gombert, 38 rue Frederic Joliot-Curie, 13388 Marseille Cedex 13, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LAM, Pole de l'Etoile Site de Chateau-Gombert, 38 rue Frederic Joliot-Curie, 13388 Marseille Cedex 13</wicri:regionArea></affiliation></author><author><name sortKey="Basa, S" sort="Basa, S" uniqKey="Basa S" first="S." last="Basa">S. Basa</name><affiliation wicri:level="1"><mods:affiliation>LAM, Pole de l'Etoile Site de Chateau-Gombert, 38 rue Frederic Joliot-Curie, 13388 Marseille Cedex 13, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LAM, Pole de l'Etoile Site de Chateau-Gombert, 38 rue Frederic Joliot-Curie, 13388 Marseille Cedex 13</wicri:regionArea></affiliation></author><author><name sortKey="Carlberg, R G" sort="Carlberg, R G" uniqKey="Carlberg R" first="R. G." last="Carlberg">R. G. Carlberg</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto ON M5S 3H4, Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto ON M5S 3H4</wicri:regionArea></affiliation></author><author><name sortKey="Fouchez, D" sort="Fouchez, D" uniqKey="Fouchez D" first="D." last="Fouchez">D. Fouchez</name><affiliation wicri:level="1"><mods:affiliation>CPPM, Aix-Marseille Université, CNRS/IN2P3, 13288 Marseille Cedex 9, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CPPM, Aix-Marseille Université, CNRS/IN2P3, 13288 Marseille Cedex 9</wicri:regionArea></affiliation></author><author><name sortKey="Guy, J" sort="Guy, J" uniqKey="Guy J" first="J." last="Guy">J. Guy</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Hardin, D" sort="Hardin, D" uniqKey="Hardin D" first="D." last="Hardin">D. Hardin</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Hook, I M" sort="Hook, I M" uniqKey="Hook I" first="I. M." last="Hook">I. M. Hook</name><affiliation wicri:level="4"><mods:affiliation>Department of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford OX1 3RH</mods:affiliation><orgName type="university">Université d'Oxford</orgName><country>Royaume-Uni</country><placeName><settlement type="city">Oxford</settlement><region type="nation">Angleterre</region><region type="région" nuts="1">Oxfordshire</region></placeName></affiliation><affiliation wicri:level="1"><mods:affiliation>INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio (RM), Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>INAF - Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monteporzio (RM)</wicri:regionArea></affiliation></author><author><name sortKey="Pain, R" sort="Pain, R" uniqKey="Pain R" first="R." last="Pain">R. Pain</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Palanque Delabrouille, N" sort="Palanque Delabrouille, N" uniqKey="Palanque Delabrouille N" first="N." last="Palanque-Delabrouille">N. Palanque-Delabrouille</name><affiliation wicri:level="1"><mods:affiliation>CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex</wicri:regionArea></affiliation></author><author><name sortKey="Perrett, K M" sort="Perrett, K M" uniqKey="Perrett K" first="K. M." last="Perrett">K. M. Perrett</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto ON M5S 3H4, Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto ON M5S 3H4</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Network Information Operations, DRDC Ottawa, 3701 Carling Avenue, Ottawa, ON, K1A 0Z4, Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Network Information Operations, DRDC Ottawa, 3701 Carling Avenue, Ottawa, ON, K1A 0Z4</wicri:regionArea></affiliation></author><author><name sortKey="Pritchet, C J" sort="Pritchet, C J" uniqKey="Pritchet C" first="C. J." last="Pritchet">C. J. Pritchet</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics and Astronomy, University of Victoria, PO Box 3055 STN CSC, Victoria BC V8T 1M8, Canada</mods:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Victoria, PO Box 3055 STN CSC, Victoria BC V8T 1M8</wicri:regionArea></affiliation></author><author><name sortKey="Regnault, N" sort="Regnault, N" uniqKey="Regnault N" first="N." last="Regnault">N. Regnault</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Rich, J" sort="Rich, J" uniqKey="Rich J" first="J." last="Rich">J. Rich</name><affiliation wicri:level="1"><mods:affiliation>CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex</wicri:regionArea></affiliation></author><author><name sortKey="Ruhlmann Kleider, V" sort="Ruhlmann Kleider, V" uniqKey="Ruhlmann Kleider V" first="V." last="Ruhlmann-Kleider">V. Ruhlmann-Kleider</name><affiliation wicri:level="1"><mods:affiliation>CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>CEA/Saclay, DSM/Irfu/Spp, 91191 Gif-sur-Yvette Cedex</wicri:regionArea></affiliation></author><author><name sortKey="Baumont, S" sort="Baumont, S" uniqKey="Baumont S" first="S." last="Baumont">S. Baumont</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>LPSC, CNRS-IN2P3, 53 rue des Martyrs, 38026 Grenoble Cedex, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPSC, CNRS-IN2P3, 53 rue des Martyrs, 38026 Grenoble Cedex</wicri:regionArea></affiliation></author><author><name sortKey="Hsiao, E" sort="Hsiao, E" uniqKey="Hsiao E" first="E." last="Hsiao">E. Hsiao</name><affiliation wicri:level="1"><mods:affiliation>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720</wicri:regionArea></affiliation></author><author><name sortKey="Kronborg, T" sort="Kronborg, T" uniqKey="Kronborg T" first="T." last="Kronborg">T. Kronborg</name><affiliation wicri:level="1"><mods:affiliation>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LPNHE, Université Pierre et Marie Curie Paris 6, Université Paris Diderot Paris 7, CNRS-IN2P3, 4 place Jussieu, 75252 Paris Cedex 05</wicri:regionArea></affiliation></author><author><name sortKey="Lidman, C" sort="Lidman, C" uniqKey="Lidman C" first="C." last="Lidman">C. Lidman</name><affiliation wicri:level="1"><mods:affiliation>Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Anglo-Australian Observatory, PO Box 296, Epping, NSW 1710</wicri:regionArea></affiliation></author><author><name sortKey="Perlmutter, S" sort="Perlmutter, S" uniqKey="Perlmutter S" first="S." last="Perlmutter">S. Perlmutter</name><affiliation wicri:level="1"><mods:affiliation>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Lawrence Berkeley National Laboratory, Mail Stop 50-232, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Department of Physics, University of California, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, University of California, 366 LeConte Hall MC 7300, Berkeley, CA 94720-7300</wicri:regionArea></affiliation></author><author><name sortKey="Walker, E S" sort="Walker, E S" uniqKey="Walker E" first="E. S." last="Walker">E. S. Walker</name><affiliation wicri:level="4"><mods:affiliation>Department of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford OX1 3RH</mods:affiliation><orgName type="university">Université d'Oxford</orgName><country>Royaume-Uni</country><placeName><settlement type="city">Oxford</settlement><region type="nation">Angleterre</region><region type="région" nuts="1">Oxfordshire</region></placeName></affiliation><affiliation wicri:level="1"><mods:affiliation>Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2010-08-01">2010-08-01</date><biblScope unit="volume">406</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="782">782</biblScope><biblScope unit="page" to="802">802</biblScope></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">Precision cosmology with Type Ia supernovae (SNe Ia) makes use of the fact that SN Ia luminosities depend on their light-curve shapes and colours. Using Supernova Legacy Survey (SNLS) and other data, we show that there is an additional dependence on the global characteristics of their host galaxies: events of the same light-curve shape and colour are, on average, 0.08 mag (≃4.0σ) brighter in massive host galaxies (presumably metal-rich) and galaxies with low specific star formation rates (sSFR). These trends do not depend on any assumed cosmological model, and are independent of the SN light-curve width: both fast and slow-declining events show the same trends. SNe Ia in galaxies with a low sSFR also have a smaller slope (‘β’) between their luminosities and colours with ∼2.7σ significance, and a smaller scatter on SN Ia Hubble diagrams (at 95 per cent confidence), though the significance of these effects is dependent on the reddest SNe. SN Ia colours are similar between low-mass and high-mass hosts, leading us to interpret their luminosity differences as an intrinsic property of the SNe and not of some external factor such as dust. If the host stellar mass is interpreted as a metallicity indicator using galaxy mass–metallicity relations, the luminosity trends are in qualitative agreement with theoretical predictions. We show that the average stellar mass, and therefore the average metallicity, of our SN Ia host galaxies decreases with redshift. The SN Ia luminosity differences consequently introduce a systematic error in cosmological analyses, comparable to the current statistical uncertainties on parameters such as w, the equation of state of dark energy. We show that the use of two SN Ia absolute magnitudes, one for events in high-mass (metal-rich) galaxies and the other for events in low-mass (metal-poor) galaxies, adequately corrects for the differences. Cosmological fits incorporating these terms give a significant reduction in χ2 (3.8σ–4.5σ); linear corrections based on host parameters do not perform as well. We conclude that all future SN Ia cosmological analyses should use a correction of this (or similar) form to control demographic shifts in the underlying galaxy population.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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|texte= The dependence of Type Ia Supernovae luminosities on their host galaxies
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