The kinematic identification of a thick stellar disc in M31
Identifieur interne : 006A15 ( Main/Merge ); précédent : 006A14; suivant : 006A16The kinematic identification of a thick stellar disc in M31
Auteurs : M. L. M. Collins [États-Unis] ; S. C. Chapman [États-Unis] ; R. A. Ibata [France] ; M. J. Irwin [États-Unis] ; R. M. Rich [États-Unis] ; A. M. N. Ferguson [États-Unis] ; G. F. Lewis [Australie] ; N. Tanvir [Royaume-Uni] ; A. Koch [Royaume-Uni]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011.
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Abstract
We present the first characterization of a thick-disc component in the Andromeda galaxy (M31) using kinematic data from the DEIMOS instrument on Keck II. Using 21 fields in the south-west of the galaxy, we measure the lag of this component with respect to the thin disc, as well as the dispersion, metallicity and scalelength of the component. We find an average lag between the two components of ?Δù? = 46.0 ± 3.9 km s-1. The velocity dispersion of the thick disc is σthick= 50.8±1.9 km s-1, greater than the value of dispersion we determine for the thin disc, σthin= 35.7 ± 1.0 km s-1. The thick disc is more metal poor than the thin disc, with [Fe/H]spec=-1.0±0.1 compared with [Fe/H]spec=-0.7 ± 0.05 for the thin disc. We measure a radial scalelength of the thin and thick discs of hr = 7.3±1.0 and 8.0 ± 1.2 kpc, respectively. From this, we infer scaleheights for both discs of 1.1±0.2 and 2.8± 0.6 kpc, both of which are approximately two to three times larger than those observed in the Milky Way. We estimate a mass range for the thick-disc component of 2.4 x1010 < M*,thick < 4.1× 1010 M◦.. This value provides a useful constraint on possible formation mechanisms, as any proposed method for forming a thick disc must be able to heat (or deposit) at least this amount of material.
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Rich</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Physics and Astronomy, University of California</s1><s2>Los Angeles, CA 90095-1547</s2><s3>USA</s3><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Los Angeles, CA 90095-1547</wicri:noRegion></affiliation></author><author><name sortKey="Ferguson, A M N" sort="Ferguson, A M N" uniqKey="Ferguson A" first="A. M. N." last="Ferguson">A. M. N. Ferguson</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill</s1><s2>Edinburgh EH9 3HJ</s2><s3>USA</s3><sZ>6 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Edinburgh EH9 3HJ</wicri:noRegion><orgName type="university">Université d'Édimbourg</orgName><placeName><settlement type="city">Édimbourg</settlement><region type="country">Écosse</region></placeName></affiliation></author><author><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name><affiliation wicri:level="4"><inist:fA14 i1="05"><s1>Sydney Institute for Astronomy, School of Physics, A29, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>7 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></affiliation></author><author><name sortKey="Tanvir, N" sort="Tanvir, N" uniqKey="Tanvir N" first="N." last="Tanvir">N. Tanvir</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics & Astronomy, University of Leicester, University Road</s1><s2>Leicester LE1 7RH</s2><s3>GBR</s3><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Leicester LE1 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Koch, A" sort="Koch, A" uniqKey="Koch A" first="A." last="Koch">A. Koch</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics & Astronomy, University of Leicester, University Road</s1><s2>Leicester LE1 7RH</s2><s3>GBR</s3><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Leicester LE1 7RH</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">11-0260679</idno><date when="2011">2011</date><idno type="stanalyst">PASCAL 11-0260679 INIST</idno><idno type="RBID">Pascal:11-0260679</idno><idno type="wicri:Area/PascalFrancis/Corpus">001D11</idno><idno type="wicri:Area/PascalFrancis/Curation">004232</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">001564</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">001564</idno><idno type="wicri:doubleKey">0035-8711:2011:Collins M:the:kinematic:identification</idno><idno type="wicri:Area/Main/Merge">006A15</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">The kinematic identification of a thick stellar disc in M31</title><author><name sortKey="Collins, M L M" sort="Collins, M L M" uniqKey="Collins M" first="M. L. M." last="Collins">M. L. M. Collins</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1><s2>Cambridge CB3 0HA</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion><orgName type="university">Université de Cambridge</orgName><placeName><settlement type="city">Cambridge</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Angleterre de l'Est</region></placeName></affiliation></author><author><name sortKey="Chapman, S C" sort="Chapman, S C" uniqKey="Chapman S" first="S. C." last="Chapman">S. C. Chapman</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1><s2>Cambridge CB3 0HA</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion><orgName type="university">Université de Cambridge</orgName><placeName><settlement type="city">Cambridge</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Angleterre de l'Est</region></placeName></affiliation></author><author><name sortKey="Ibata, R A" sort="Ibata, R A" uniqKey="Ibata R" first="R. A." last="Ibata">R. A. Ibata</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Observatoire de Strasbourg, 11 rue de l'Université</s1><s2>67000 Strasbourg</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>67000 Strasbourg</wicri:noRegion><placeName><settlement type="city">Strasbourg</settlement><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Alsace (région administrative)</region></placeName></affiliation></author><author><name sortKey="Irwin, M J" sort="Irwin, M J" uniqKey="Irwin M" first="M. J." last="Irwin">M. J. Irwin</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1><s2>Cambridge CB3 0HA</s2><s3>USA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Cambridge CB3 0HA</wicri:noRegion><orgName type="university">Université de Cambridge</orgName><placeName><settlement type="city">Cambridge</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Angleterre de l'Est</region></placeName></affiliation></author><author><name sortKey="Rich, R M" sort="Rich, R M" uniqKey="Rich R" first="R. M." last="Rich">R. M. Rich</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Physics and Astronomy, University of California</s1><s2>Los Angeles, CA 90095-1547</s2><s3>USA</s3><sZ>5 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Los Angeles, CA 90095-1547</wicri:noRegion></affiliation></author><author><name sortKey="Ferguson, A M N" sort="Ferguson, A M N" uniqKey="Ferguson A" first="A. M. N." last="Ferguson">A. M. N. Ferguson</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill</s1><s2>Edinburgh EH9 3HJ</s2><s3>USA</s3><sZ>6 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Edinburgh EH9 3HJ</wicri:noRegion><orgName type="university">Université d'Édimbourg</orgName><placeName><settlement type="city">Édimbourg</settlement><region type="country">Écosse</region></placeName></affiliation></author><author><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name><affiliation wicri:level="4"><inist:fA14 i1="05"><s1>Sydney Institute for Astronomy, School of Physics, A29, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>7 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></affiliation></author><author><name sortKey="Tanvir, N" sort="Tanvir, N" uniqKey="Tanvir N" first="N." last="Tanvir">N. Tanvir</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics & Astronomy, University of Leicester, University Road</s1><s2>Leicester LE1 7RH</s2><s3>GBR</s3><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Leicester LE1 7RH</wicri:noRegion></affiliation></author><author><name sortKey="Koch, A" sort="Koch, A" uniqKey="Koch A" first="A." last="Koch">A. Koch</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics & Astronomy, University of Leicester, University Road</s1><s2>Leicester LE1 7RH</s2><s3>GBR</s3><sZ>8 aut.</sZ><sZ>9 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Leicester LE1 7RH</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbreviated">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbreviated">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abundance</term><term>Deimos</term><term>Formation mechanism</term><term>Galaxy evolution</term><term>Galaxy structure</term><term>Local group</term><term>Mars satellite</term><term>Metallicity</term><term>Milky Way</term><term>Spiral galaxies</term><term>Stellar dynamics</term><term>Stellar kinematics</term><term>Velocity dispersion</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Cinématique stellaire</term><term>Galaxies spirales</term><term>Deimos</term><term>Métallicité</term><term>Dispersion vitesse</term><term>Voie lactée</term><term>Mécanisme formation</term><term>Dynamique stellaire</term><term>Abondance</term><term>Evolution galaxies</term><term>Groupe local</term><term>Structure galaxies</term><term>Satellite Mars</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present the first characterization of a thick-disc component in the Andromeda galaxy (M31) using kinematic data from the DEIMOS instrument on Keck II. Using 21 fields in the south-west of the galaxy, we measure the lag of this component with respect to the thin disc, as well as the dispersion, metallicity and scalelength of the component. We find an average lag between the two components of ?Δù? = 46.0 ± 3.9 km s<sup>-1</sup>. The velocity dispersion of the thick disc is σ<sub>thick</sub>= 50.8±1.9 km s<sup>-1</sup>, greater than the value of dispersion we determine for the thin disc, σ<sub>thin</sub>= 35.7 ± 1.0 km s<sup>-1</sup>. The thick disc is more metal poor than the thin disc, with [Fe/H]<sub>spec</sub>=-1.0±0.1 compared with [Fe/H]<sub>spec</sub>=-0.7 ± 0.05 for the thin disc. We measure a radial scalelength of the thin and thick discs of h<sub>r</sub> = 7.3±1.0 and 8.0 ± 1.2 kpc, respectively. From this, we infer scaleheights for both discs of 1.1±0.2 and 2.8± 0.6 kpc, both of which are approximately two to three times larger than those observed in the Milky Way. We estimate a mass range for the thick-disc component of 2.4 x10<sup>10</sup> < M<sub>*,thick</sub> < 4.1× 10<sup>10</sup> M<sub>◦.</sub>. This value provides a useful constraint on possible formation mechanisms, as any proposed method for forming a thick disc must be able to heat (or deposit) at least this amount of material.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Alsace (région administrative)</li><li>Angleterre</li><li>Angleterre de l'Est</li><li>Grand Est</li><li>Nouvelle-Galles du Sud</li><li>Écosse</li></region><settlement><li>Cambridge</li><li>Strasbourg</li><li>Sydney</li><li>Édimbourg</li></settlement><orgName><li>Université d'Édimbourg</li><li>Université de Cambridge</li><li>Université de Sydney</li></orgName></list><tree><country name="États-Unis"><region name="Angleterre"><name sortKey="Collins, M L M" sort="Collins, M L M" uniqKey="Collins M" first="M. L. M." last="Collins">M. L. M. Collins</name></region><name sortKey="Chapman, S C" sort="Chapman, S C" uniqKey="Chapman S" first="S. C." last="Chapman">S. C. Chapman</name><name sortKey="Ferguson, A M N" sort="Ferguson, A M N" uniqKey="Ferguson A" first="A. M. N." last="Ferguson">A. M. N. Ferguson</name><name sortKey="Irwin, M J" sort="Irwin, M J" uniqKey="Irwin M" first="M. J." last="Irwin">M. J. Irwin</name><name sortKey="Rich, R M" sort="Rich, R M" uniqKey="Rich R" first="R. M." last="Rich">R. M. Rich</name></country><country name="France"><region name="Grand Est"><name sortKey="Ibata, R A" sort="Ibata, R A" uniqKey="Ibata R" first="R. A." last="Ibata">R. A. Ibata</name></region></country><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name></region></country><country name="Royaume-Uni"><noRegion><name sortKey="Tanvir, N" sort="Tanvir, N" uniqKey="Tanvir N" first="N." last="Tanvir">N. Tanvir</name></noRegion><name sortKey="Koch, A" sort="Koch, A" uniqKey="Koch A" first="A." last="Koch">A. Koch</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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