A radial velocity survey of low galactic latitude structures - : I. Kinematics of the Canis Major dwarf galaxy
Identifieur interne : 00B420 ( Main/Merge ); précédent : 00B419; suivant : 00B421A radial velocity survey of low galactic latitude structures - : I. Kinematics of the Canis Major dwarf galaxy
Auteurs : N. F. Martin [France] ; R. A. Ibata [France] ; B. C. Conn [Australie] ; G. F. Lewis [Australie] ; M. Bellazzini [Italie] ; M. J. Irwin [Royaume-Uni]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2005.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
As part of a radial velocity survey of low Galactic latitude structures that we undertook with the 2dF spectrograph on the Anglo-Australian Telescope, we present the radial velocities of more than 1500 red giant branch and red clump stars towards the centre of the Canis Major dwarf galaxy. With a mean velocity of 72 ± 7 km s-1 at a heliocentric distance of 5.5 kpc and 114 ± 2 km s-1 at 8.5 kpc, these stars present a peculiar distance - radial velocity relation that is unlike that expected from thin or thick disc stars. Moreover, they belong to a kinematically cold population with an intrinsic dispersion that may be as low as 11+3-1 km s-1. A comparison of the velocity distribution obtained in this work with previous studies shows the importance of using our new reduction pipeline and averaging the velocities obtained from different templates. The radial velocity distribution is used to select Canis Major stars in the UCAC2.0 proper motion catalogue and derive proper motions in Galactic coordinates of (μl, μb) = (-3.6 ± 0.8 mas yr-1, 1.5 ± 0.4 mas yr-1) for the dwarf galaxy, which after correcting for the reflex solar motion along this line of sight gives (μ'l, μ'b) = (-6.8 ± 0.8 mas yr-1, 0.8 ± 0.4 mas yr-1), corresponding to a prograde orbit with a tangential velocity of ∼235 km s-1 at the average distance of ∼7.2 kpc. All these kinematic constraints can be reproduced in simulations of the accretion of a dwarf on to the Galactic disc. Such a process could also be responsible for the Monoceros Ring that has recently been shown to encompass the Galactic disc. However, without constraints on the kinematics of the tidal arms emerging from the Canis Major dwarf, it is not yet possible to definitively prove a link between the two structures.
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Kinematics of the Canis Major dwarf galaxy</title><author><name sortKey="Martin, N F" sort="Martin, N F" uniqKey="Martin N" first="N. F." last="Martin">N. F. Martin</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Observatoire de Strasbourg, 11, rue de l'Université</s1><s2>67000, Strasbourg</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Grand Est</region><region type="old region">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></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="3"><inist:fA14 i1="01"><s1>Observatoire de Strasbourg, 11, rue de l'Université</s1><s2>67000, Strasbourg</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region">Grand Est</region><region type="old region">Alsace (région administrative)</region><settlement type="city">Strasbourg</settlement></placeName></affiliation></author><author><name sortKey="Conn, B C" sort="Conn, B C" uniqKey="Conn B" first="B. C." last="Conn">B. C. 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Lewis</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Institute of Astronomy, School of Physics, A29, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>4 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="Bellazzini, M" sort="Bellazzini, M" uniqKey="Bellazzini M" first="M." last="Bellazzini">M. Bellazzini</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>INAF - Osservatorio Astronomico di Bologna, Via Ranzani 1</s1><s3>ITA</s3><sZ>5 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>INAF - Osservatorio Astronomico di Bologna, Via Ranzani 1</wicri:noRegion></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="1"><inist:fA14 i1="04"><s1>Institute of Astronomy, Madingley Road</s1><s2>Cambridge CB3 0HA</s2><s3>GBR</s3><sZ>6 aut.</sZ></inist:fA14><country>Royaume-Uni</country><wicri:noRegion>Cambridge CB3 0HA</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="2005">2005</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>Accretion</term><term>Astronomical catalogues</term><term>Dwarf galaxies</term><term>Galactic disks</term><term>Galactic structure</term><term>Galaxy structure</term><term>Heliocentric distance</term><term>Kinematics</term><term>Milky Way</term><term>Orbits</term><term>Peculiar stars</term><term>Proper motion</term><term>Radial distribution</term><term>Radial velocity</term><term>Red giant stars</term><term>Velocity distribution</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Vitesse radiale</term><term>Structure galactique</term><term>Cinématique</term><term>Galaxies naines</term><term>Géante rouge</term><term>Distance héliocentrique</term><term>Etoile particulière</term><term>Distribution vitesse</term><term>Distribution radiale</term><term>Mouvement propre</term><term>Catalogue astronomique</term><term>Orbite</term><term>Accrétion</term><term>Disque galactique</term><term>Voie lactée</term><term>Structure galaxies</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">As part of a radial velocity survey of low Galactic latitude structures that we undertook with the 2dF spectrograph on the Anglo-Australian Telescope, we present the radial velocities of more than 1500 red giant branch and red clump stars towards the centre of the Canis Major dwarf galaxy. With a mean velocity of 72 ± 7 km s<sup>-1</sup> at a heliocentric distance of 5.5 kpc and 114 ± 2 km s<sup>-1</sup> at 8.5 kpc, these stars present a peculiar distance - radial velocity relation that is unlike that expected from thin or thick disc stars. Moreover, they belong to a kinematically cold population with an intrinsic dispersion that may be as low as 11<sup>+3</sup><sub>-1</sub> km s<sup>-1</sup>. A comparison of the velocity distribution obtained in this work with previous studies shows the importance of using our new reduction pipeline and averaging the velocities obtained from different templates. The radial velocity distribution is used to select Canis Major stars in the UCAC2.0 proper motion catalogue and derive proper motions in Galactic coordinates of (μ<sub>l</sub>, μ<sub>b</sub>) = (-3.6 ± 0.8 mas yr<sup>-1</sup>, 1.5 ± 0.4 mas yr<sup>-1</sup>) for the dwarf galaxy, which after correcting for the reflex solar motion along this line of sight gives (μ'<sub>l</sub>, μ'<sub>b</sub>) = (-6.8 ± 0.8 mas yr<sup>-1</sup>, 0.8 ± 0.4 mas yr<sup>-1</sup>), corresponding to a prograde orbit with a tangential velocity of ∼235 km s<sup>-1</sup> at the average distance of ∼7.2 kpc. All these kinematic constraints can be reproduced in simulations of the accretion of a dwarf on to the Galactic disc. Such a process could also be responsible for the Monoceros Ring that has recently been shown to encompass the Galactic disc. However, without constraints on the kinematics of the tidal arms emerging from the Canis Major dwarf, it is not yet possible to definitively prove a link between the two structures.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Italie</li><li>Royaume-Uni</li></country><region><li>Alsace (région administrative)</li><li>Grand Est</li><li>Nouvelle-Galles du Sud</li></region><settlement><li>Strasbourg</li><li>Sydney</li></settlement><orgName><li>Université de Sydney</li></orgName></list><tree><country name="France"><region name="Grand Est"><name sortKey="Martin, N F" sort="Martin, N F" uniqKey="Martin N" first="N. F." last="Martin">N. F. Martin</name></region><name sortKey="Ibata, R A" sort="Ibata, R A" uniqKey="Ibata R" first="R. A." last="Ibata">R. A. Ibata</name></country><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Conn, B C" sort="Conn, B C" uniqKey="Conn B" first="B. C." last="Conn">B. C. Conn</name></region><name sortKey="Lewis, G F" sort="Lewis, G F" uniqKey="Lewis G" first="G. F." last="Lewis">G. F. Lewis</name></country><country name="Italie"><noRegion><name sortKey="Bellazzini, M" sort="Bellazzini, M" uniqKey="Bellazzini M" first="M." last="Bellazzini">M. Bellazzini</name></noRegion></country><country name="Royaume-Uni"><noRegion><name sortKey="Irwin, M J" sort="Irwin, M J" uniqKey="Irwin M" first="M. J." last="Irwin">M. J. Irwin</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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