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Thick disk kinematics from RAVE and the solar motion

Identifieur interne : 005814 ( Main/Exploration ); précédent : 005813; suivant : 005815

Thick disk kinematics from RAVE and the solar motion

Auteurs : S. Pasetto [Royaume-Uni, Allemagne] ; E. K. Grebel [Allemagne] ; T. Zwitter [Slovénie] ; C. Chiosi [Italie] ; G. Bertelli [Italie] ; O. Bienayme [France] ; G. Seabroke [Royaume-Uni] ; J. Bland-Hawthorn [Australie] ; C. Boeche [Allemagne] ; B. K. Gibson [Royaume-Uni, Australie] ; G. Gilmore [Royaume-Uni] ; U. Munari [Italie] ; J. F. Navarro [Canada] ; Q. Parker [Australie] ; W. Reid [Australie] ; A. Silviero [Italie, Allemagne] ; M. Steinmetz [Allemagne]

Source :

RBID : Pascal:13-0057314

Descripteurs français

English descriptors

Abstract

Context. Radial velocity surveys such as the RAdial Velocity Experiment (RAVE) provide us with measurements of hundreds of thousands of nearby stars most of which belong to the Galactic thin, thick disk or halo. Ideally, to study the Galactic disks (both thin and thick) one should make use of the multi-dimensional phase-space and the whole pattern of chemical abundances of their stellar populations. Aims. In this paper, with the aid of the RAVE survey, we study the thin and thick disks of the Milky Way, focusing on the latter. We present a technique to disentangle the stellar content of the two disks based on the kinematics and other stellar parameters such as the surface gravity of the stars. Using the Padova Galaxy model, we checked the ability of our method to correctly isolate the thick disk component from the Galaxy mixture of stellar populations. Methods. We introduce selection criteria in order to clean the observed radial velocities from the Galactic differential rotation and to take into account the partial sky coverage of RAVE. We developed a numerical technique to statistically disentangle thin and thick disks from their mixture. Results. We deduce the components of the solar motion relative to the local standard of rest (LSR) in the radial and vertical direction, the rotational lag of the thick disk component relative to the LSR, and the square root of the absolute value of the velocity dispersion tensor for the thick disk alone. The analysis of the thin disk is presented in another paper. We find good agreement with previous independent parameter determinations. In our analysis we used photometrically determined distances. In the Appendix we show that similar values can be found for the thick disk alone as derived in the main sections of our paper even without the knowledge of photometric distances.


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<settlement type="city">Sydney</settlement>
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<orgName type="university">Université de Sydney</orgName>
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<name sortKey="Boeche, C" sort="Boeche, C" uniqKey="Boeche C" first="C." last="Boeche">C. Boeche</name>
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<country>Australie</country>
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<country>Australie</country>
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<country>Australie</country>
<wicri:noRegion>Macquarie research centre in Astronomy, Astrophysics and Astrophotonics, Macquarie University NSW 2109</wicri:noRegion>
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<name sortKey="Silviero, A" sort="Silviero, A" uniqKey="Silviero A" first="A." last="Silviero">A. Silviero</name>
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<country>Italie</country>
<wicri:noRegion>35122 Padova</wicri:noRegion>
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<affiliation wicri:level="1">
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<s1>Leibniz-Institut fur Astrophysik Potsdam (AIP), An der Sternwarte 16</s1>
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<sZ>16 aut.</sZ>
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<country>Allemagne</country>
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<wicri:noRegion>14482 Potsdam</wicri:noRegion>
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<name sortKey="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</name>
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<wicri:noRegion>14482 Potsdam</wicri:noRegion>
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</analytic>
<series>
<title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title>
<title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title>
<idno type="ISSN">0004-6361</idno>
<imprint>
<date when="2012">2012</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
<seriesStmt>
<title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title>
<title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title>
<idno type="ISSN">0004-6361</idno>
</seriesStmt>
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<profileDesc>
<textClass>
<keywords scheme="KwdEn" xml:lang="en">
<term>Abundance</term>
<term>Analytical method</term>
<term>Differential rotation</term>
<term>Galactic disks</term>
<term>Galaxies</term>
<term>Galaxy structure</term>
<term>Milky Way</term>
<term>Models</term>
<term>Nearby stars</term>
<term>Numerical method</term>
<term>Phase space</term>
<term>Physical parameter</term>
<term>Radial velocity</term>
<term>Selection criterion</term>
<term>Stellar content</term>
<term>Stellar dynamics</term>
<term>Stellar kinematics</term>
<term>Stellar population</term>
<term>Surface gravity</term>
<term>Velocity dispersion</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr">
<term>Cinématique stellaire</term>
<term>Vitesse radiale</term>
<term>Etoile proche</term>
<term>Disque galactique</term>
<term>Espace phase</term>
<term>Abondance</term>
<term>Population stellaire</term>
<term>Voie lactée</term>
<term>Contenu stellaire</term>
<term>Paramètre physique</term>
<term>Gravité surface</term>
<term>Galaxies</term>
<term>Modèle</term>
<term>Critère sélection</term>
<term>Rotation différentielle</term>
<term>Dispersion vitesse</term>
<term>Dynamique stellaire</term>
<term>Méthode analytique</term>
<term>Méthode numérique</term>
<term>Structure galaxies</term>
</keywords>
</textClass>
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</teiHeader>
<front>
<div type="abstract" xml:lang="en">Context. Radial velocity surveys such as the RAdial Velocity Experiment (RAVE) provide us with measurements of hundreds of thousands of nearby stars most of which belong to the Galactic thin, thick disk or halo. Ideally, to study the Galactic disks (both thin and thick) one should make use of the multi-dimensional phase-space and the whole pattern of chemical abundances of their stellar populations. Aims. In this paper, with the aid of the RAVE survey, we study the thin and thick disks of the Milky Way, focusing on the latter. We present a technique to disentangle the stellar content of the two disks based on the kinematics and other stellar parameters such as the surface gravity of the stars. Using the Padova Galaxy model, we checked the ability of our method to correctly isolate the thick disk component from the Galaxy mixture of stellar populations. Methods. We introduce selection criteria in order to clean the observed radial velocities from the Galactic differential rotation and to take into account the partial sky coverage of RAVE. We developed a numerical technique to statistically disentangle thin and thick disks from their mixture. Results. We deduce the components of the solar motion relative to the local standard of rest (LSR) in the radial and vertical direction, the rotational lag of the thick disk component relative to the LSR, and the square root of the absolute value of the velocity dispersion tensor for the thick disk alone. The analysis of the thin disk is presented in another paper. We find good agreement with previous independent parameter determinations. In our analysis we used photometrically determined distances. In the Appendix we show that similar values can be found for the thick disk alone as derived in the main sections of our paper even without the knowledge of photometric distances.</div>
</front>
</TEI>
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<list>
<country>
<li>Allemagne</li>
<li>Australie</li>
<li>Canada</li>
<li>France</li>
<li>Italie</li>
<li>Royaume-Uni</li>
<li>Slovénie</li>
</country>
<region>
<li>Alsace (région administrative)</li>
<li>Angleterre</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>Heidelberg</li>
<li>Londres</li>
<li>Strasbourg</li>
<li>Sydney</li>
</settlement>
<orgName>
<li>University College de Londres</li>
<li>Université de Sydney</li>
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<name sortKey="Pasetto, S" sort="Pasetto, S" uniqKey="Pasetto S" first="S." last="Pasetto">S. Pasetto</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="Allemagne">
<region name="Bade-Wurtemberg">
<name sortKey="Pasetto, S" sort="Pasetto, S" uniqKey="Pasetto S" first="S." last="Pasetto">S. Pasetto</name>
</region>
<name sortKey="Boeche, C" sort="Boeche, C" uniqKey="Boeche C" first="C." last="Boeche">C. Boeche</name>
<name sortKey="Grebel, E K" sort="Grebel, E K" uniqKey="Grebel E" first="E. K." last="Grebel">E. K. Grebel</name>
<name sortKey="Silviero, A" sort="Silviero, A" uniqKey="Silviero A" first="A." last="Silviero">A. Silviero</name>
<name sortKey="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</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>
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<name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
</country>
<country name="Italie">
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<name sortKey="Chiosi, C" sort="Chiosi, C" uniqKey="Chiosi C" first="C." last="Chiosi">C. Chiosi</name>
</noRegion>
<name sortKey="Bertelli, G" sort="Bertelli, G" uniqKey="Bertelli G" first="G." last="Bertelli">G. Bertelli</name>
<name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name>
<name sortKey="Silviero, A" sort="Silviero, A" uniqKey="Silviero A" first="A." last="Silviero">A. Silviero</name>
</country>
<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>
</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="Gibson, B K" sort="Gibson, B K" uniqKey="Gibson B" first="B. K." last="Gibson">B. K. Gibson</name>
<name sortKey="Parker, Q" sort="Parker, Q" uniqKey="Parker Q" first="Q." last="Parker">Q. Parker</name>
<name sortKey="Parker, Q" sort="Parker, Q" uniqKey="Parker Q" first="Q." last="Parker">Q. Parker</name>
<name sortKey="Parker, Q" sort="Parker, Q" uniqKey="Parker Q" first="Q." last="Parker">Q. Parker</name>
<name sortKey="Reid, W" sort="Reid, W" uniqKey="Reid W" first="W." last="Reid">W. Reid</name>
<name sortKey="Reid, W" sort="Reid, W" uniqKey="Reid W" first="W." last="Reid">W. Reid</name>
</country>
<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>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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