AustralieFrV1, PascalFrancis, Curation, bibRecord, 004235

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

Identifieur interne : 004235 ( PascalFrancis/Curation ); précédent : 004234; suivant : 004236

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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A11	`04`	`1`		`@1 BREDDELS (Maarten A.)`
A11	`05`	`1`		`@1 BIENAYME (O.)`
A11	`06`	`1`		`@1 BINNEY (J.)`
A11	`07`	`1`		`@1 BLAND-HAWTHORN (J.)`
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A11	`15`	`1`		`@1 NAVARRO (J. F.)`
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A11	`24`	`1`		`@1 ZWITTER (T.)`
A14	`01`			`@1 Department of Astronomy, Case Western University @2 Cleveland, OH 44106 @3 USA @Z 1 aut. @Z 3 aut.`
A14	`02`			`@1 Kapteyn Astronomical Institute, PO Box 800 Groningen @3 NLD @Z 2 aut. @Z 4 aut.`
A14	`03`			`@1 Université de Strasbourg, Observatoire Astronomique @2 67000 Strasbourg @3 FRA @Z 5 aut. @Z 19 aut.`
A14	`04`			`@1 Rudolf Peierls Centre for Theoretical Physics @2 Oxford OX1 3NP @3 GBR @Z 6 aut.`
A14	`05`			`@1 Anglo-Australian Observatory @2 Sydney @3 AUS @Z 7 aut. @Z 16 aut.`
A14	`06`			`@1 Astrophysikalishes Institut Potsdam, An der Sternwarte 16 @2 14482 Potsdam @3 DEU @Z 8 aut. @Z 20 aut. @Z 21 aut. @Z 22 aut.`
A14	`07`			`@1 Macquary University @2 Sydney, NSW 2109 @3 AUS @Z 8 aut. @Z 16 aut. @Z 17 aut.`
A14	`08`			`@1 RSAA Australian National University, Mount Stromlo Observatory, Cotter Road, Weston Creek @2 Canberra, ACT 72611 @3 AUS @Z 9 aut.`
A14	`09`			`@1 Johns Hopkins University, 3400 N Charles Street @2 Baltimore, MD 21218 @3 USA @Z 10 aut. @Z 23 aut.`
A14	`10`			`@1 Jeremiah Horrocks Institute for Astrophysics & Supercomputing, University of Central Lancashire @2 Preston PRI 2HE @3 GBR @Z 11 aut.`
A14	`11`			`@1 Institute of Astronomy, University of Cambridge, Madingley Road @2 Cambridge CB3 OHA @3 GBR @Z 12 aut.`
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A14	`13`			`@1 INAF Astronomical Observatory of Padova @2 36012 Asiago @3 ITA @Z 14 aut. @Z 20 aut.`
A14	`14`			`@1 University of Victoria, PO Box 3055, Station CSC @2 Victoria, BC V8W 3P6 @3 CAN @Z 15 aut.`
A14	`15`			`@1 Mullard Space Science Laboratory, University College London, Holmbury St Mary @2 Dorking RH5 6NT @3 GBR @Z 18 aut.`
A14	`16`			`@1 Faculty of Mathematics and Physics, University of Ljubljana @3 SVN @Z 24 aut.`
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A20				`@1 2235-2241`
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A44				`@0 0000 @1 © 2011 INIST-CNRS. All rights reserved.`
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C01	`01`		`ENG`	@0 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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C03	`03`	`3`	`FRE`	`@0 Excentricité @5 28`
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C03	`04`	`3`	`FRE`	`@0 Vitesse radiale @5 29`
C03	`04`	`3`	`ENG`	`@0 Radial velocity @5 29`
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C03	`05`	`3`	`ENG`	`@0 Galaxy formation @5 30`
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Le document en format XML

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<author><name sortKey="Bland Hawthorn, J" sort="Bland Hawthorn, J" uniqKey="Bland Hawthorn J" first="J." last="Bland-Hawthorn">J. Bland-Hawthorn</name>
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<author><name sortKey="Campbell, R" sort="Campbell, R" uniqKey="Campbell R" first="R." last="Campbell">R. Campbell</name>
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<author><name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name>
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<author><name sortKey="Fulbright, J P" sort="Fulbright, J P" uniqKey="Fulbright J" first="J. P." last="Fulbright">J. P. Fulbright</name>
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<author><name sortKey="Grebel, E K" sort="Grebel, E K" uniqKey="Grebel E" first="E. K." last="Grebel">E. K. Grebel</name>
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<author><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name>
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<author><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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<author><name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name>
<affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Anglo-Australian Observatory</s1>
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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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<author><name sortKey="Seabroke, G" sort="Seabroke, G" uniqKey="Seabroke G" first="G." last="Seabroke">G. Seabroke</name>
<affiliation wicri:level="1"><inist:fA14 i1="15"><s1>Mullard Space Science Laboratory, University College London, Holmbury St Mary</s1>
<s2>Dorking RH5 6NT</s2>
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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="1"><inist:fA14 i1="03"><s1>Université de Strasbourg, Observatoire Astronomique</s1>
<s2>67000 Strasbourg</s2>
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</author>
<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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</inist:fA14>
<country>Allemagne</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="13"><s1>INAF Astronomical Observatory of Padova</s1>
<s2>36012 Asiago</s2>
<s3>ITA</s3>
<sZ>14 aut.</sZ>
<sZ>20 aut.</sZ>
</inist:fA14>
<country>Italie</country>
</affiliation>
</author>
<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>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
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</inist:fA14>
<country>Allemagne</country>
</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>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
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<country>Allemagne</country>
</affiliation>
</author>
<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>
<affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Johns Hopkins University, 3400 N Charles Street</s1>
<s2>Baltimore, MD 21218</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
<sZ>23 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
</affiliation>
</author>
<author><name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
<affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Faculty of Mathematics and Physics, University of Ljubljana</s1>
<s3>SVN</s3>
<sZ>24 aut.</sZ>
</inist:fA14>
<country>Slovénie</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Center, of excellence SPACE-SI</s1>
<s2>Ljubljana</s2>
<s3>SVN</s3>
<sZ>24 aut.</sZ>
</inist:fA14>
<country>Slovénie</country>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">INIST</idno>
<idno type="inist">11-0260755</idno>
<date when="2011">2011</date>
<idno type="stanalyst">PASCAL 11-0260755 INIST</idno>
<idno type="RBID">Pascal:11-0260755</idno>
<idno type="wicri:Area/PascalFrancis/Corpus">001D08</idno>
<idno type="wicri:Area/PascalFrancis/Curation">004235</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Testing formation mechanisms of the Milky Way's thick disc with RAVE</title>
<author><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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<s2>Cleveland, OH 44106</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
</affiliation>
</author>
<author><name sortKey="Helmi, Amina" sort="Helmi, Amina" uniqKey="Helmi A" first="Amina" last="Helmi">Amina Helmi</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Kapteyn Astronomical Institute, PO Box 800 Groningen</s1>
<s3>NLD</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>Pays-Bas</country>
</affiliation>
</author>
<author><name sortKey="Morrison, Heather L" sort="Morrison, Heather L" uniqKey="Morrison H" first="Heather L." last="Morrison">Heather L. Morrison</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Astronomy, Case Western University</s1>
<s2>Cleveland, OH 44106</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
</affiliation>
</author>
<author><name sortKey="Breddels, Maarten A" sort="Breddels, Maarten A" uniqKey="Breddels M" first="Maarten A." last="Breddels">Maarten A. Breddels</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Kapteyn Astronomical Institute, PO Box 800 Groningen</s1>
<s3>NLD</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>Pays-Bas</country>
</affiliation>
</author>
<author><name sortKey="Bienayme, O" sort="Bienayme, O" uniqKey="Bienayme O" first="O." last="Bienayme">O. Bienayme</name>
<affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Université de Strasbourg, Observatoire Astronomique</s1>
<s2>67000 Strasbourg</s2>
<s3>FRA</s3>
<sZ>5 aut.</sZ>
<sZ>19 aut.</sZ>
</inist:fA14>
<country>France</country>
</affiliation>
</author>
<author><name sortKey="Binney, J" sort="Binney, J" uniqKey="Binney J" first="J." last="Binney">J. Binney</name>
<affiliation wicri:level="1"><inist:fA14 i1="04"><s1>Rudolf Peierls Centre for Theoretical Physics</s1>
<s2>Oxford OX1 3NP</s2>
<s3>GBR</s3>
<sZ>6 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
</affiliation>
</author>
<author><name sortKey="Bland Hawthorn, J" sort="Bland Hawthorn, J" uniqKey="Bland Hawthorn J" first="J." last="Bland-Hawthorn">J. Bland-Hawthorn</name>
<affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Anglo-Australian Observatory</s1>
<s2>Sydney</s2>
<s3>AUS</s3>
<sZ>7 aut.</sZ>
<sZ>16 aut.</sZ>
</inist:fA14>
<country>Australie</country>
</affiliation>
</author>
<author><name sortKey="Campbell, R" sort="Campbell, R" uniqKey="Campbell R" first="R." last="Campbell">R. Campbell</name>
<affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Astrophysikalishes Institut Potsdam, An der Sternwarte 16</s1>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
<sZ>21 aut.</sZ>
<sZ>22 aut.</sZ>
</inist:fA14>
<country>Allemagne</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Macquary University</s1>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>8 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
</inist:fA14>
<country>Australie</country>
</affiliation>
</author>
<author><name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name>
<affiliation wicri:level="1"><inist:fA14 i1="08"><s1>RSAA Australian National University, Mount Stromlo Observatory, Cotter Road, Weston Creek</s1>
<s2>Canberra, ACT 72611</s2>
<s3>AUS</s3>
<sZ>9 aut.</sZ>
</inist:fA14>
<country>Australie</country>
</affiliation>
</author>
<author><name sortKey="Fulbright, J P" sort="Fulbright, J P" uniqKey="Fulbright J" first="J. P." last="Fulbright">J. P. Fulbright</name>
<affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Johns Hopkins University, 3400 N Charles Street</s1>
<s2>Baltimore, MD 21218</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
<sZ>23 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
</affiliation>
</author>
<author><name sortKey="Gibson, B K" sort="Gibson, B K" uniqKey="Gibson B" first="B. K." last="Gibson">B. K. Gibson</name>
<affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Jeremiah Horrocks Institute for Astrophysics & Supercomputing, University of Central Lancashire</s1>
<s2>Preston PRI 2HE</s2>
<s3>GBR</s3>
<sZ>11 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
</affiliation>
</author>
<author><name sortKey="Gilmore, G" sort="Gilmore, G" uniqKey="Gilmore G" first="G." last="Gilmore">G. Gilmore</name>
<affiliation wicri:level="1"><inist:fA14 i1="11"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1>
<s2>Cambridge CB3 OHA</s2>
<s3>GBR</s3>
<sZ>12 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
</affiliation>
</author>
<author><name sortKey="Grebel, E K" sort="Grebel, E K" uniqKey="Grebel E" first="E. K." last="Grebel">E. K. Grebel</name>
<affiliation wicri:level="1"><inist:fA14 i1="12"><s1>Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg</s1>
<s2>69120 Heidelberg</s2>
<s3>DEU</s3>
<sZ>13 aut.</sZ>
</inist:fA14>
<country>Allemagne</country>
</affiliation>
</author>
<author><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name>
<affiliation wicri:level="1"><inist:fA14 i1="13"><s1>INAF Astronomical Observatory of Padova</s1>
<s2>36012 Asiago</s2>
<s3>ITA</s3>
<sZ>14 aut.</sZ>
<sZ>20 aut.</sZ>
</inist:fA14>
<country>Italie</country>
</affiliation>
</author>
<author><name sortKey="Navarro, J F" sort="Navarro, J F" uniqKey="Navarro J" first="J. F." last="Navarro">J. F. Navarro</name>
<affiliation wicri:level="1"><inist:fA14 i1="14"><s1>University of Victoria, PO Box 3055, Station CSC</s1>
<s2>Victoria, BC V8W 3P6</s2>
<s3>CAN</s3>
<sZ>15 aut.</sZ>
</inist:fA14>
<country>Canada</country>
</affiliation>
</author>
<author><name sortKey="Parker, Q A" sort="Parker, Q A" uniqKey="Parker Q" first="Q. A." last="Parker">Q. A. Parker</name>
<affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Anglo-Australian Observatory</s1>
<s2>Sydney</s2>
<s3>AUS</s3>
<sZ>7 aut.</sZ>
<sZ>16 aut.</sZ>
</inist:fA14>
<country>Australie</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="07"><s1>Macquary University</s1>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>8 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
</inist:fA14>
<country>Australie</country>
</affiliation>
</author>
<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>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>8 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
</inist:fA14>
<country>Australie</country>
</affiliation>
</author>
<author><name sortKey="Seabroke, G" sort="Seabroke, G" uniqKey="Seabroke G" first="G." last="Seabroke">G. Seabroke</name>
<affiliation wicri:level="1"><inist:fA14 i1="15"><s1>Mullard Space Science Laboratory, University College London, Holmbury St Mary</s1>
<s2>Dorking RH5 6NT</s2>
<s3>GBR</s3>
<sZ>18 aut.</sZ>
</inist:fA14>
<country>Royaume-Uni</country>
</affiliation>
</author>
<author><name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</name>
<affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Université de Strasbourg, Observatoire Astronomique</s1>
<s2>67000 Strasbourg</s2>
<s3>FRA</s3>
<sZ>5 aut.</sZ>
<sZ>19 aut.</sZ>
</inist:fA14>
<country>France</country>
</affiliation>
</author>
<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>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
<sZ>21 aut.</sZ>
<sZ>22 aut.</sZ>
</inist:fA14>
<country>Allemagne</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="13"><s1>INAF Astronomical Observatory of Padova</s1>
<s2>36012 Asiago</s2>
<s3>ITA</s3>
<sZ>14 aut.</sZ>
<sZ>20 aut.</sZ>
</inist:fA14>
<country>Italie</country>
</affiliation>
</author>
<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>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
<sZ>21 aut.</sZ>
<sZ>22 aut.</sZ>
</inist:fA14>
<country>Allemagne</country>
</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>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
<sZ>21 aut.</sZ>
<sZ>22 aut.</sZ>
</inist:fA14>
<country>Allemagne</country>
</affiliation>
</author>
<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>
<affiliation wicri:level="1"><inist:fA14 i1="09"><s1>Johns Hopkins University, 3400 N Charles Street</s1>
<s2>Baltimore, MD 21218</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
<sZ>23 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
</affiliation>
</author>
<author><name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
<affiliation wicri:level="1"><inist:fA14 i1="16"><s1>Faculty of Mathematics and Physics, University of Ljubljana</s1>
<s3>SVN</s3>
<sZ>24 aut.</sZ>
</inist:fA14>
<country>Slovénie</country>
</affiliation>
<affiliation wicri:level="1"><inist:fA14 i1="17"><s1>Center, of excellence SPACE-SI</s1>
<s2>Ljubljana</s2>
<s3>SVN</s3>
<sZ>24 aut.</sZ>
</inist:fA14>
<country>Slovénie</country>
</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>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>
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</fA02>
<fA03 i2="1"><s0>Mon. Not. R. Astron. Soc.</s0>
</fA03>
<fA05><s2>413</s2>
</fA05>
<fA06><s2>3</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Testing formation mechanisms of the Milky Way's thick disc with RAVE</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>WILSON (Michelle L.)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>HELMI (Amina)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>MORRISON (Heather L.)</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>BREDDELS (Maarten A.)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>BIENAYME (O.)</s1>
</fA11>
<fA11 i1="06" i2="1"><s1>BINNEY (J.)</s1>
</fA11>
<fA11 i1="07" i2="1"><s1>BLAND-HAWTHORN (J.)</s1>
</fA11>
<fA11 i1="08" i2="1"><s1>CAMPBELL (R.)</s1>
</fA11>
<fA11 i1="09" i2="1"><s1>FREEMAN (K. C.)</s1>
</fA11>
<fA11 i1="10" i2="1"><s1>FULBRIGHT (J. P.)</s1>
</fA11>
<fA11 i1="11" i2="1"><s1>GIBSON (B. K.)</s1>
</fA11>
<fA11 i1="12" i2="1"><s1>GILMORE (G.)</s1>
</fA11>
<fA11 i1="13" i2="1"><s1>GREBEL (E. K.)</s1>
</fA11>
<fA11 i1="14" i2="1"><s1>MUNARI (U.)</s1>
</fA11>
<fA11 i1="15" i2="1"><s1>NAVARRO (J. F.)</s1>
</fA11>
<fA11 i1="16" i2="1"><s1>PARKER (Q. A.)</s1>
</fA11>
<fA11 i1="17" i2="1"><s1>REID (W.)</s1>
</fA11>
<fA11 i1="18" i2="1"><s1>SEABROKE (G.)</s1>
</fA11>
<fA11 i1="19" i2="1"><s1>SIEBERT (A.)</s1>
</fA11>
<fA11 i1="20" i2="1"><s1>SIVIERO (A.)</s1>
</fA11>
<fA11 i1="21" i2="1"><s1>STEINMETZ (M.)</s1>
</fA11>
<fA11 i1="22" i2="1"><s1>WILLIAMS (M. E. K.)</s1>
</fA11>
<fA11 i1="23" i2="1"><s1>WYSE (R. F. G.)</s1>
</fA11>
<fA11 i1="24" i2="1"><s1>ZWITTER (T.)</s1>
</fA11>
<fA14 i1="01"><s1>Department of Astronomy, Case Western University</s1>
<s2>Cleveland, OH 44106</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Kapteyn Astronomical Institute, PO Box 800 Groningen</s1>
<s3>NLD</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
</fA14>
<fA14 i1="03"><s1>Université de Strasbourg, Observatoire Astronomique</s1>
<s2>67000 Strasbourg</s2>
<s3>FRA</s3>
<sZ>5 aut.</sZ>
<sZ>19 aut.</sZ>
</fA14>
<fA14 i1="04"><s1>Rudolf Peierls Centre for Theoretical Physics</s1>
<s2>Oxford OX1 3NP</s2>
<s3>GBR</s3>
<sZ>6 aut.</sZ>
</fA14>
<fA14 i1="05"><s1>Anglo-Australian Observatory</s1>
<s2>Sydney</s2>
<s3>AUS</s3>
<sZ>7 aut.</sZ>
<sZ>16 aut.</sZ>
</fA14>
<fA14 i1="06"><s1>Astrophysikalishes Institut Potsdam, An der Sternwarte 16</s1>
<s2>14482 Potsdam</s2>
<s3>DEU</s3>
<sZ>8 aut.</sZ>
<sZ>20 aut.</sZ>
<sZ>21 aut.</sZ>
<sZ>22 aut.</sZ>
</fA14>
<fA14 i1="07"><s1>Macquary University</s1>
<s2>Sydney, NSW 2109</s2>
<s3>AUS</s3>
<sZ>8 aut.</sZ>
<sZ>16 aut.</sZ>
<sZ>17 aut.</sZ>
</fA14>
<fA14 i1="08"><s1>RSAA Australian National University, Mount Stromlo Observatory, Cotter Road, Weston Creek</s1>
<s2>Canberra, ACT 72611</s2>
<s3>AUS</s3>
<sZ>9 aut.</sZ>
</fA14>
<fA14 i1="09"><s1>Johns Hopkins University, 3400 N Charles Street</s1>
<s2>Baltimore, MD 21218</s2>
<s3>USA</s3>
<sZ>10 aut.</sZ>
<sZ>23 aut.</sZ>
</fA14>
<fA14 i1="10"><s1>Jeremiah Horrocks Institute for Astrophysics & Supercomputing, University of Central Lancashire</s1>
<s2>Preston PRI 2HE</s2>
<s3>GBR</s3>
<sZ>11 aut.</sZ>
</fA14>
<fA14 i1="11"><s1>Institute of Astronomy, University of Cambridge, Madingley Road</s1>
<s2>Cambridge CB3 OHA</s2>
<s3>GBR</s3>
<sZ>12 aut.</sZ>
</fA14>
<fA14 i1="12"><s1>Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg</s1>
<s2>69120 Heidelberg</s2>
<s3>DEU</s3>
<sZ>13 aut.</sZ>
</fA14>
<fA14 i1="13"><s1>INAF Astronomical Observatory of Padova</s1>
<s2>36012 Asiago</s2>
<s3>ITA</s3>
<sZ>14 aut.</sZ>
<sZ>20 aut.</sZ>
</fA14>
<fA14 i1="14"><s1>University of Victoria, PO Box 3055, Station CSC</s1>
<s2>Victoria, BC V8W 3P6</s2>
<s3>CAN</s3>
<sZ>15 aut.</sZ>
</fA14>
<fA14 i1="15"><s1>Mullard Space Science Laboratory, University College London, Holmbury St Mary</s1>
<s2>Dorking RH5 6NT</s2>
<s3>GBR</s3>
<sZ>18 aut.</sZ>
</fA14>
<fA14 i1="16"><s1>Faculty of Mathematics and Physics, University of Ljubljana</s1>
<s3>SVN</s3>
<sZ>24 aut.</sZ>
</fA14>
<fA14 i1="17"><s1>Center, of excellence SPACE-SI</s1>
<s2>Ljubljana</s2>
<s3>SVN</s3>
<sZ>24 aut.</sZ>
</fA14>
<fA20><s1>2235-2241</s1>
</fA20>
<fA21><s1>2011</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>2067</s2>
<s5>354000192127200610</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2011 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>1/4 p.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>11-0260755</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Monthly Notices of the Royal Astronomical Society</s0>
</fA64>
<fA66 i1="01"><s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>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.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001E03</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Mécanisme formation</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Formation mechanism</s0>
<s5>26</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Mecanismo formacion</s0>
<s5>26</s5>
</fC03>
<fC03 i1="02" i2="3" l="FRE"><s0>Voie lactée</s0>
<s5>27</s5>
</fC03>
<fC03 i1="02" i2="3" l="ENG"><s0>Milky Way</s0>
<s5>27</s5>
</fC03>
<fC03 i1="03" i2="3" l="FRE"><s0>Excentricité</s0>
<s5>28</s5>
</fC03>
<fC03 i1="03" i2="3" l="ENG"><s0>Eccentricity</s0>
<s5>28</s5>
</fC03>
<fC03 i1="04" i2="3" l="FRE"><s0>Vitesse radiale</s0>
<s5>29</s5>
</fC03>
<fC03 i1="04" i2="3" l="ENG"><s0>Radial velocity</s0>
<s5>29</s5>
</fC03>
<fC03 i1="05" i2="3" l="FRE"><s0>Formation galaxies</s0>
<s5>30</s5>
</fC03>
<fC03 i1="05" i2="3" l="ENG"><s0>Galaxy formation</s0>
<s5>30</s5>
</fC03>
<fC03 i1="06" i2="3" l="FRE"><s0>Accrétion stellaire</s0>
<s5>31</s5>
</fC03>
<fC03 i1="06" i2="3" l="ENG"><s0>Star accretion</s0>
<s5>31</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Modèle</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Models</s0>
<s5>32</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Modelo</s0>
<s5>32</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Galaxies disques</s0>
<s5>33</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Disk galaxies</s0>
<s5>33</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Orbite</s0>
<s5>34</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Orbits</s0>
<s5>34</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Voisinage solaire</s0>
<s5>35</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Solar neighborhood</s0>
<s5>35</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Vecindad solar</s0>
<s5>35</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Structure galaxies</s0>
<s5>36</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Galaxy structure</s0>
<s5>36</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Estructura galaxias</s0>
<s5>36</s5>
</fC03>
<fN21><s1>178</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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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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