Detection of a radial velocity gradient in the extended local disc with RAVE
Identifieur interne : 000877 ( Istex/Checkpoint ); précédent : 000876; suivant : 000878Detection of a radial velocity gradient in the extended local disc with RAVE
Auteurs : A. Siebert [France] ; B. Famaey [France] ; I. Minchev [France] ; G. M. Seabroke [Royaume-Uni] ; J. Binney ; B. Burnett ; K. C. Freeman [Australie] ; M. Williams [Allemagne] ; O. Bienaymé [France] ; J. Bland-Hawthorn [Australie] ; R. Campbell [Allemagne] ; J. P. Fulbright [États-Unis] ; B. K. Gibson ; G. Gilmore [Royaume-Uni] ; E. K. Grebel [Allemagne] ; A. Helmi [Pays-Bas] ; U. Munari [Italie] ; J. F. Navarro [Canada] ; Q. A. Parker [Australie] ; W. A. Reid [Australie] ; A. Siviero [Allemagne, Italie] ; M. Steinmetz [Allemagne] ; F. Watson [Australie] ; R. F. G. Wyse [États-Unis] ; T. Zwitter [Slovénie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2011-04-11.
English descriptors
- KwdEn :
- Asymmetric drift, Binney, Bottom panels, Centre, Circular rotation, Clump candidates, Clump sample, Clump selection, Clump stars, Disc stars, Distance moduli, Error bars, External galaxies, Famaey binney, Formal sigmas, Full curves, Full sample, Galactic, Galactic centre, Galactic disc, Galactic parameters, Galactic plane, Galactic rotation, Galactocentric, Galactocentric radius, Galaxy, Hipparcos sphere, Inner galaxy, Johns hopkins university, Local divergence, Mcmillan binney, Milky, Minchev, Minchev quillen, Mnras, Monte carlo sampling, Monthly notices, Oort, Oort constants, Open circle, Other hand, Padova isochrones, Possible systematics, Proper motions, Quillen, Radial, Radial motion, Radial velocity, Radial velocity gradient, Rotation curve, Solar circle, Solar neighbourhood, Spiral arms, Stellar, Stellar kinematics, Such motions, Taylor expansion, Thin disc, Thin disc ellipsoid, Velocity gradient, Velocity maps, Velocity trends.
- Teeft :
- Asymmetric drift, Binney, Bottom panels, Centre, Circular rotation, Clump candidates, Clump sample, Clump selection, Clump stars, Disc stars, Distance moduli, Error bars, External galaxies, Famaey binney, Formal sigmas, Full curves, Full sample, Galactic, Galactic centre, Galactic disc, Galactic parameters, Galactic plane, Galactic rotation, Galactocentric, Galactocentric radius, Galaxy, Hipparcos sphere, Inner galaxy, Johns hopkins university, Local divergence, Mcmillan binney, Milky, Minchev, Minchev quillen, Mnras, Monte carlo sampling, Monthly notices, Oort, Oort constants, Open circle, Other hand, Padova isochrones, Possible systematics, Proper motions, Quillen, Radial, Radial motion, Radial velocity, Radial velocity gradient, Rotation curve, Solar circle, Solar neighbourhood, Spiral arms, Stellar, Stellar kinematics, Such motions, Taylor expansion, Thin disc, Thin disc ellipsoid, Velocity gradient, Velocity maps, Velocity trends.
Abstract
Using a sample of 213 713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2 kpc from the Sun and to |z| < 1 kpc, we report the detection of a velocity gradient of disc stars in the fourth quadrant, directed radially from the Galactic Centre. In the direction of the Galactic Centre, we apply a simple method independent of stellar proper motions and of Galactic parameters to assess the existence of this gradient in the RAVE data. This velocity gradient corresponds to |K+C| > rsim 3 km s−1 kpc−1, where K and C are the Oort constants measuring the local divergence and radial shear of the velocity field, respectively. In order to illustrate the effect, assuming a zero radial velocity of the local standard of rest we then reconstruct the two‐dimensional Galactocentric velocity maps using two different sets of proper motions and photometric distances based either on isochrone fitting or on K‐band magnitudes, and considering two sets of values for the Galactocentric radius of the Sun and local circular speed. Further observational confirmation of our finding with line‐of‐sight velocities of stars at low latitudes, together with further modelling, should help constrain the non‐axisymmetric components of the Galactic potential, including the bar, the spiral arms and possibly the ellipticity of the dark halo.
Url:
DOI: 10.1111/j.1365-2966.2010.18037.x
Affiliations:
- Allemagne, Australie, Canada, France, Italie, Pays-Bas, Royaume-Uni, Slovénie, États-Unis
- Alsace (région administrative), Angleterre, Angleterre de l'Est, Bade-Wurtemberg, District de Karlsruhe, Grand Est, Grand Londres, Groningue (province), Maryland, Nouvelle-Galles du Sud
- Cambridge, Groningue (ville), Heidelberg, Londres, Strasbourg, Sydney
- University College de Londres, Université de Cambridge, Université de Groningue, Université de Strasbourg, Université de Sydney
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Helmi</name><affiliation wicri:level="4"><country xml:lang="fr" wicri:curation="lc">Pays-Bas</country><wicri:regionArea>Kapteyn Astronomical Institut, University of Groningen, Landleven 12, 9747 AD Groningen</wicri:regionArea><orgName type="university">Université de Groningue</orgName><placeName><settlement type="city">Groningue (ville)</settlement><region>Groningue (province)</region></placeName></affiliation></author><author><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>INAF Astronomical Observatory of Padova, 36012 Asiago (VI)</wicri:regionArea><wicri:noRegion>36012 Asiago (VI)</wicri:noRegion></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"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6</wicri:regionArea><wicri:noRegion>BC V8W 3P6</wicri:noRegion></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="3"><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Physics and Astronomy, Faculty of Science, Macquarrie University, NSW 2109, Sydney</wicri:regionArea><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Reid, W A" sort="Reid, W A" uniqKey="Reid W" first="W. A." last="Reid">W. A. Reid</name><affiliation wicri:level="3"><country xml:lang="fr">Australie</country><wicri:regionArea>Department of Physics and Astronomy, Faculty of Science, Macquarrie University, NSW 2109, Sydney</wicri:regionArea><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName></affiliation></author><author><name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Astrophysikalishes Institut Potsdam, An der Sternwarte 16, D‐14482 Potsdam</wicri:regionArea><wicri:noRegion>14482 Potsdam</wicri:noRegion><wicri:noRegion>D‐14482 Potsdam</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Italie</country><wicri:regionArea>INAF Astronomical Observatory of Padova, 36012 Asiago (VI)</wicri:regionArea><wicri:noRegion>36012 Asiago (VI)</wicri:noRegion></affiliation></author><author><name sortKey="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</name><affiliation wicri:level="1"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Astrophysikalishes Institut Potsdam, An der Sternwarte 16, D‐14482 Potsdam</wicri:regionArea><wicri:noRegion>14482 Potsdam</wicri:noRegion><wicri:noRegion>D‐14482 Potsdam</wicri:noRegion></affiliation></author><author><name sortKey="Watson, F" sort="Watson, F" uniqKey="Watson F" first="F." last="Watson">F. Watson</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>Australian Astronomical Observatory, P.O. Box 296, Epping, NSW 1710</wicri:regionArea><wicri:noRegion>NSW 1710</wicri:noRegion></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="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Johns Hopkins University, Department of Physics and Astronomy, 366 Bloomberg Center, 3400 N.Charles Street, Baltimore, MD 21218</wicri:regionArea><placeName><region type="state">Maryland</region></placeName></affiliation></author><author><name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name><affiliation wicri:level="1"><country xml:lang="fr">Slovénie</country><wicri:regionArea>Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana</wicri:regionArea><wicri:noRegion> 1000 Ljubljana</wicri:noRegion></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Slovénie</country><wicri:regionArea>Center of excellence, SPACE‐SI, Aškerčeva cesta 12, 1000 Ljubljana</wicri:regionArea><wicri:noRegion> 1000 Ljubljana</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><biblScope unit="vol">412</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="2026">2026</biblScope><biblScope unit="page" to="2032">2032</biblScope><biblScope 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rotation</term><term>Galactocentric</term><term>Galactocentric radius</term><term>Galaxy</term><term>Hipparcos sphere</term><term>Inner galaxy</term><term>Johns hopkins university</term><term>Local divergence</term><term>Mcmillan binney</term><term>Milky</term><term>Minchev</term><term>Minchev quillen</term><term>Mnras</term><term>Monte carlo sampling</term><term>Monthly notices</term><term>Oort</term><term>Oort constants</term><term>Open circle</term><term>Other hand</term><term>Padova isochrones</term><term>Possible systematics</term><term>Proper motions</term><term>Quillen</term><term>Radial</term><term>Radial motion</term><term>Radial velocity</term><term>Radial velocity gradient</term><term>Rotation curve</term><term>Solar circle</term><term>Solar neighbourhood</term><term>Spiral arms</term><term>Stellar</term><term>Stellar kinematics</term><term>Such motions</term><term>Taylor expansion</term><term>Thin disc</term><term>Thin disc ellipsoid</term><term>Velocity gradient</term><term>Velocity maps</term><term>Velocity trends</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Asymmetric drift</term><term>Binney</term><term>Bottom panels</term><term>Centre</term><term>Circular rotation</term><term>Clump candidates</term><term>Clump sample</term><term>Clump selection</term><term>Clump stars</term><term>Disc stars</term><term>Distance moduli</term><term>Error bars</term><term>External galaxies</term><term>Famaey binney</term><term>Formal sigmas</term><term>Full curves</term><term>Full sample</term><term>Galactic</term><term>Galactic centre</term><term>Galactic disc</term><term>Galactic parameters</term><term>Galactic plane</term><term>Galactic rotation</term><term>Galactocentric</term><term>Galactocentric radius</term><term>Galaxy</term><term>Hipparcos sphere</term><term>Inner galaxy</term><term>Johns hopkins university</term><term>Local divergence</term><term>Mcmillan binney</term><term>Milky</term><term>Minchev</term><term>Minchev quillen</term><term>Mnras</term><term>Monte carlo sampling</term><term>Monthly notices</term><term>Oort</term><term>Oort constants</term><term>Open circle</term><term>Other hand</term><term>Padova isochrones</term><term>Possible systematics</term><term>Proper motions</term><term>Quillen</term><term>Radial</term><term>Radial motion</term><term>Radial velocity</term><term>Radial velocity gradient</term><term>Rotation curve</term><term>Solar circle</term><term>Solar neighbourhood</term><term>Spiral arms</term><term>Stellar</term><term>Stellar kinematics</term><term>Such motions</term><term>Taylor expansion</term><term>Thin disc</term><term>Thin disc ellipsoid</term><term>Velocity gradient</term><term>Velocity maps</term><term>Velocity trends</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Using a sample of 213 713 stars from the Radial Velocity Experiment (RAVE) survey, limited to a distance of 2 kpc from the Sun and to |z| < 1 kpc, we report the detection of a velocity gradient of disc stars in the fourth quadrant, directed radially from the Galactic Centre. In the direction of the Galactic Centre, we apply a simple method independent of stellar proper motions and of Galactic parameters to assess the existence of this gradient in the RAVE data. This velocity gradient corresponds to |K+C| > rsim 3 km s−1 kpc−1, where K and C are the Oort constants measuring the local divergence and radial shear of the velocity field, respectively. In order to illustrate the effect, assuming a zero radial velocity of the local standard of rest we then reconstruct the two‐dimensional Galactocentric velocity maps using two different sets of proper motions and photometric distances based either on isochrone fitting or on K‐band magnitudes, and considering two sets of values for the Galactocentric radius of the Sun and local circular speed. Further observational confirmation of our finding with line‐of‐sight velocities of stars at low latitudes, together with further modelling, should help constrain the non‐axisymmetric components of the Galactic potential, including the bar, the spiral arms and possibly the ellipticity of the dark halo.</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>Groningue (province)</li><li>Maryland</li><li>Nouvelle-Galles du Sud</li></region><settlement><li>Cambridge</li><li>Groningue (ville)</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 Groningue</li><li>Université de Strasbourg</li><li>Université de Sydney</li></orgName></list><tree><noCountry><name sortKey="Binney, J" sort="Binney, J" uniqKey="Binney J" first="J." last="Binney">J. Binney</name><name sortKey="Burnett, B" sort="Burnett, B" uniqKey="Burnett B" first="B." last="Burnett">B. Burnett</name><name sortKey="Gibson, B K" sort="Gibson, B K" uniqKey="Gibson B" first="B. K." last="Gibson">B. K. Gibson</name></noCountry><country name="France"><region name="Grand Est"><name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</name></region><name sortKey="Bienayme, O" sort="Bienayme, O" uniqKey="Bienayme O" first="O." last="Bienaymé">O. Bienaymé</name><name sortKey="Famaey, B" sort="Famaey, B" uniqKey="Famaey B" first="B." last="Famaey">B. Famaey</name><name sortKey="Minchev, I" sort="Minchev, I" uniqKey="Minchev I" first="I." last="Minchev">I. Minchev</name><name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</name></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Seabroke, G M" sort="Seabroke, G M" uniqKey="Seabroke G" first="G. M." last="Seabroke">G. M. Seabroke</name></region><name sortKey="Gilmore, G" sort="Gilmore, G" uniqKey="Gilmore G" first="G." last="Gilmore">G. Gilmore</name></country><country name="Australie"><noRegion><name sortKey="Freeman, K C" sort="Freeman, K C" uniqKey="Freeman K" first="K. C." last="Freeman">K. C. Freeman</name></noRegion><name sortKey="Bland Awthorn, J" sort="Bland Awthorn, J" uniqKey="Bland Awthorn J" first="J." last="Bland-Hawthorn">J. Bland-Hawthorn</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 A" sort="Reid, W A" uniqKey="Reid W" first="W. A." last="Reid">W. A. Reid</name><name sortKey="Watson, F" sort="Watson, F" uniqKey="Watson F" first="F." last="Watson">F. Watson</name></country><country name="Allemagne"><noRegion><name sortKey="Williams, M" sort="Williams, M" uniqKey="Williams M" first="M." last="Williams">M. Williams</name></noRegion><name sortKey="Campbell, R" sort="Campbell, R" uniqKey="Campbell R" first="R." last="Campbell">R. Campbell</name><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></country><country name="États-Unis"><region name="Maryland"><name sortKey="Fulbright, J P" sort="Fulbright, J P" uniqKey="Fulbright J" first="J. P." last="Fulbright">J. P. Fulbright</name></region><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></country><country name="Pays-Bas"><region name="Groningue (province)"><name sortKey="Helmi, A" sort="Helmi, A" uniqKey="Helmi A" first="A." last="Helmi">A. Helmi</name></region></country><country name="Italie"><noRegion><name sortKey="Munari, U" sort="Munari, U" uniqKey="Munari U" first="U." last="Munari">U. Munari</name></noRegion><name sortKey="Siviero, A" sort="Siviero, A" uniqKey="Siviero A" first="A." last="Siviero">A. Siviero</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><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>Pour manipuler ce document sous Unix (Dilib)
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