AustralieFrV1, Main, Merge, bibRecord, 006A69

Testing formation mechanisms of the Milky Way's thick disc with RAVE

Identifieur interne : 006A69 ( Main/Merge ); précédent : 006A68; suivant : 006A70

Testing formation mechanisms of the Milky Way's thick disc with RAVE

Auteurs : Michelle L. Wilson [États-Unis] ; Amina Helmi [Pays-Bas] ; Heather L. Morrison [États-Unis] ; Maarten A. Breddels [Pays-Bas] ; O. Bienayme [France] ; J. Binney [Royaume-Uni] ; J. Bland-Hawthorn [Australie] ; R. Campbell [Allemagne, Australie] ; K. C. Freeman [Australie] ; J. P. Fulbright [États-Unis] ; B. K. Gibson [Royaume-Uni] ; G. Gilmore [Royaume-Uni] ; E. K. Grebel [Allemagne] ; U. Munari [Italie] ; J. F. Navarro [Canada] ; Q. A. Parker [Australie] ; W. Reid [Australie] ; G. Seabroke [Royaume-Uni] ; A. Siebert [France] ; A. Siviero [Allemagne, Italie] ; M. Steinmetz [Allemagne] ; M. E. K. Williams [Allemagne] ; R. F. G. Wyse [États-Unis] ; T. Zwitter [Slovénie]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011.

RBID : Pascal:11-0260755

Descripteurs français

Pascal (Inist)
- Mécanisme formation, Voie lactée, Excentricité, Vitesse radiale, Formation galaxies, Accrétion stellaire, Modèle, Galaxies disques, Orbite, Voisinage solaire, Structure galaxies.

English descriptors

KwdEn :
- Disk galaxies, Eccentricity, Formation mechanism, Galaxy formation, Galaxy structure, Milky Way, Models, Orbits, Radial velocity, Solar neighborhood, Star accretion.

Abstract

We study the eccentricity distribution of a thick-disc sample of stars (defined as those with V_y>50 km s^-1 and 1 < |z|/kpc < 3) observed in the Radial Velocity Experiment (RAVE). We compare this distribution with those obtained in four simulations of galaxy formation taken from the literature as compiled by Sales et al. Each simulation emphasizes different scenarios for the origin of such stars (satellite accretion, heating of a pre-existing thin disc during a merger, radial migration, and gas-rich mergers). We find that the observed distribution peaks at low eccentricities and falls off smoothly and rather steeply to high eccentricities. This finding is fairly robust to changes in distances and to plausible assumptions about thin-disc contamination. Our results favour models where the majority of stars formed in the Galaxy itself on orbits of modest eccentricity and disfavour the pure satellite accretion case. A gas-rich merger origin where most of the stars form 'in situ' appears to be the most consistent with our data.

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Le document en format XML

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<s3>CAN</s3>
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<sZ>7 aut.</sZ>
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<country>Australie</country>
<placeName><settlement type="city">Sydney</settlement>
<region type="état">Nouvelle-Galles du Sud</region>
</placeName>
</affiliation>
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<sZ>8 aut.</sZ>
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<sZ>17 aut.</sZ>
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<country>Australie</country>
<wicri:noRegion>Macquary University</wicri:noRegion>
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<author><name sortKey="Reid, W" sort="Reid, W" uniqKey="Reid W" first="W." last="Reid">W. Reid</name>
<affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Macquary University</s1>
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<s3>AUS</s3>
<sZ>8 aut.</sZ>
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<sZ>17 aut.</sZ>
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<country>Australie</country>
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<author><name sortKey="Seabroke, G" sort="Seabroke, G" uniqKey="Seabroke G" first="G." last="Seabroke">G. Seabroke</name>
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<author><name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</name>
<affiliation wicri:level="4"><inist:fA14 i1="03"><s1>Université de Strasbourg, Observatoire Astronomique</s1>
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<sZ>5 aut.</sZ>
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<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>
<settlement type="city">Strasbourg</settlement>
</placeName>
<orgName type="university">Université de Strasbourg</orgName>
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<author><name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
<affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Astrophysikalishes Institut Potsdam, An der Sternwarte 16</s1>
<s2>14482 Potsdam</s2>
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<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
<sZ>21 aut.</sZ>
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<country>Allemagne</country>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
<wicri:noRegion>An der Sternwarte 16</wicri:noRegion>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
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<country>Italie</country>
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<author><name sortKey="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</name>
<affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Astrophysikalishes Institut Potsdam, An der Sternwarte 16</s1>
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<wicri:noRegion>14482 Potsdam</wicri:noRegion>
<wicri:noRegion>An der Sternwarte 16</wicri:noRegion>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Williams, M E K" sort="Williams, M E K" uniqKey="Williams M" first="M. E. K." last="Williams">M. E. K. Williams</name>
<affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Astrophysikalishes Institut Potsdam, An der Sternwarte 16</s1>
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<wicri:noRegion>An der Sternwarte 16</wicri:noRegion>
<wicri:noRegion>14482 Potsdam</wicri:noRegion>
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<author><name sortKey="Wyse, R F G" sort="Wyse, R F G" uniqKey="Wyse R" first="R. F. G." last="Wyse">R. F. G. Wyse</name>
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<s3>USA</s3>
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<country>États-Unis</country>
<wicri:noRegion>Baltimore, MD 21218</wicri:noRegion>
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</author>
<author><name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
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<wicri:noRegion>Faculty of Mathematics and Physics, University of Ljubljana</wicri:noRegion>
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<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>Disk galaxies</term>
<term>Eccentricity</term>
<term>Formation mechanism</term>
<term>Galaxy formation</term>
<term>Galaxy structure</term>
<term>Milky Way</term>
<term>Models</term>
<term>Orbits</term>
<term>Radial velocity</term>
<term>Solar neighborhood</term>
<term>Star accretion</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Mécanisme formation</term>
<term>Voie lactée</term>
<term>Excentricité</term>
<term>Vitesse radiale</term>
<term>Formation galaxies</term>
<term>Accrétion stellaire</term>
<term>Modèle</term>
<term>Galaxies disques</term>
<term>Orbite</term>
<term>Voisinage solaire</term>
<term>Structure galaxies</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">We study the eccentricity distribution of a thick-disc sample of stars (defined as those with V<sub>y</sub>
>50 km s<sup>-1</sup>
 and 1 < |z|/kpc < 3) observed in the Radial Velocity Experiment (RAVE). We compare this distribution with those obtained in four simulations of galaxy formation taken from the literature as compiled by Sales et al. Each simulation emphasizes different scenarios for the origin of such stars (satellite accretion, heating of a pre-existing thin disc during a merger, radial migration, and gas-rich mergers). We find that the observed distribution peaks at low eccentricities and falls off smoothly and rather steeply to high eccentricities. This finding is fairly robust to changes in distances and to plausible assumptions about thin-disc contamination. Our results favour models where the majority of stars formed in the Galaxy itself on orbits of modest eccentricity and disfavour the pure satellite accretion case. A gas-rich merger origin where most of the stars form 'in situ' appears to be the most consistent with our data.</div>
</front>
</TEI>
<affiliations><list><country><li>Allemagne</li>
<li>Australie</li>
<li>Canada</li>
<li>France</li>
<li>Italie</li>
<li>Pays-Bas</li>
<li>Royaume-Uni</li>
<li>Slovénie</li>
<li>États-Unis</li>
</country>
<region><li>Alsace (région administrative)</li>
<li>Angleterre</li>
<li>Angleterre de l'Est</li>
<li>Bade-Wurtemberg</li>
<li>District de Karlsruhe</li>
<li>Grand Est</li>
<li>Grand Londres</li>
<li>Nouvelle-Galles du Sud</li>
</region>
<settlement><li>Cambridge</li>
<li>Heidelberg</li>
<li>Londres</li>
<li>Strasbourg</li>
<li>Sydney</li>
</settlement>
<orgName><li>University College de Londres</li>
<li>Université de Cambridge</li>
<li>Université de Strasbourg</li>
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<tree><country name="États-Unis"><noRegion><name sortKey="Wilson, Michelle L" sort="Wilson, Michelle L" uniqKey="Wilson M" first="Michelle L." last="Wilson">Michelle L. Wilson</name>
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<name sortKey="Fulbright, J P" sort="Fulbright, J P" uniqKey="Fulbright J" first="J. P." last="Fulbright">J. P. Fulbright</name>
<name sortKey="Morrison, Heather L" sort="Morrison, Heather L" uniqKey="Morrison H" first="Heather L." last="Morrison">Heather L. Morrison</name>
<name sortKey="Wyse, R F G" sort="Wyse, R F G" uniqKey="Wyse R" first="R. F. G." last="Wyse">R. F. G. Wyse</name>
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</noRegion>
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<country name="France"><region name="Grand Est"><name sortKey="Bienayme, O" sort="Bienayme, O" uniqKey="Bienayme O" first="O." last="Bienayme">O. Bienayme</name>
</region>
<name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</name>
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<country name="Royaume-Uni"><noRegion><name sortKey="Binney, J" sort="Binney, J" uniqKey="Binney J" first="J." last="Binney">J. Binney</name>
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<name sortKey="Gibson, B K" sort="Gibson, B K" uniqKey="Gibson B" first="B. K." last="Gibson">B. K. Gibson</name>
<name sortKey="Gilmore, G" sort="Gilmore, G" uniqKey="Gilmore G" first="G." last="Gilmore">G. Gilmore</name>
<name sortKey="Seabroke, G" sort="Seabroke, G" uniqKey="Seabroke G" first="G." last="Seabroke">G. Seabroke</name>
</country>
<country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Bland Hawthorn, J" sort="Bland Hawthorn, J" uniqKey="Bland Hawthorn J" first="J." last="Bland-Hawthorn">J. Bland-Hawthorn</name>
</region>
<name sortKey="Campbell, R" sort="Campbell, R" uniqKey="Campbell R" first="R." last="Campbell">R. Campbell</name>
<name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name>
<name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name>
<name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name>
<name sortKey="Reid, W" sort="Reid, W" uniqKey="Reid W" first="W." last="Reid">W. Reid</name>
</country>
<country name="Allemagne"><noRegion><name sortKey="Campbell, R" sort="Campbell, R" uniqKey="Campbell R" first="R." last="Campbell">R. Campbell</name>
</noRegion>
<name sortKey="Grebel, E K" sort="Grebel, E K" uniqKey="Grebel E" first="E. K." last="Grebel">E. K. Grebel</name>
<name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
<name sortKey="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</name>
<name sortKey="Williams, M E K" sort="Williams, M E K" uniqKey="Williams M" first="M. E. K." last="Williams">M. E. K. Williams</name>
</country>
<country name="Italie"><noRegion><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name>
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<name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name>
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<country name="Canada"><noRegion><name sortKey="Navarro, J F" sort="Navarro, J F" uniqKey="Navarro J" first="J. F." last="Navarro">J. F. Navarro</name>
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<country name="Slovénie"><noRegion><name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
</noRegion>
<name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
</country>
</tree>
</affiliations>
</record>

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	Serveur d'exploration sur les relations entre la France et l'Australie
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Serveur d'exploration sur les relations entre la France et l'Australie

Testing formation mechanisms of the Milky Way's thick disc with RAVE

Testing formation mechanisms of the Milky Way's thick disc with RAVE

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