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Is the sky falling? Searching for stellar streams in the local Milky Way disc in the CORAVEL and RAVE surveys

Identifieur interne : 008792 ( Main/Exploration ); précédent : 008791; suivant : 008793

Is the sky falling? Searching for stellar streams in the local Milky Way disc in the CORAVEL and RAVE surveys

Auteurs : G. M. Seabroke [Royaume-Uni] ; G. Gilmore [Royaume-Uni] ; A. Siebert [Allemagne] ; O. Bienaymé [France] ; J. Binney [Royaume-Uni] ; J. Bland-Hawthorn [Australie] ; R. Campbell [Australie] ; K. C. Freeman [Australie] ; B. Gibson ; E. K. Grebel [Suisse, Allemagne] ; A. Helmi [Pays-Bas] ; U. Munari [Italie] ; J. F. Navarro [Canada] ; Q. A. Parker [Australie] ; A. Siviero [Italie] ; M. Steinmetz [Allemagne] ; F. G. Watson [Australie] ; R. F. G. Wyse [États-Unis] ; T. Zwitter [Slovénie] ; J. Pe Arrubia [Canada] ; M. C. Smith [Royaume-Uni] ; M. Williams [Australie]

Source :

RBID : ISTEX:BD1834875F938FCC41D7FC9E82CC19724EC3BAF6

Descripteurs français

English descriptors

Abstract

We have searched for in‐falling stellar streams on to the local Milky Way disc in the CORrelation RAdial VELocities (CORAVEL) and RAdial Velocity Experiment (RAVE) surveys. The CORAVEL survey consists of local dwarf stars (Nördstrom et al. Geneva–Copenhagen survey) and local Famaey et al. giant stars. We select RAVE stars with radial velocities that are sensitive to the Galactic vertical space velocity (Galactic latitude b < −45°). Kuiper statistics have been employed to test the symmetry of the Galactic vertical velocity distribution functions in these samples for evidence of a net vertical flow that could be associated with a (tidal?) stream of stars with vertically coherent kinematics. In contrast to the ‘Field of Streams’ found in the outer halo, we find that the local volumes of the solar neighbourhood sampled by the CORAVEL dwarfs (complete within ∼3 × 10−4 kpc3), CORAVEL giants (complete within ∼5 × 10−2 kpc3) and RAVE (5–15 per cent complete within ∼8 kpc3) are devoid of any vertically coherent streams containing hundreds of stars. This is sufficiently sensitive to allow our RAVE sample to rule out the passing of the tidal stream of the disrupting Sagittarius (Sgr) dwarf galaxy through the solar neighbourhood. This agrees with the most‐recent determinations of its orbit and dissociates it from the Helmi et al. halo stream. Our constraints on the absence of the Sgr stream near the Sun could prove a useful tool for discriminating between Galactic potential models. The lack of a net vertical flow through the solar neighbourhood in the CORAVEL giants and RAVE samples argues against the Virgo overdensity crossing the disc near the Sun. There are no vertical streams in the CORAVEL giants and RAVE samples with stellar densities ≳1.6 × 104 and 1.5 × 103 stars kpc−3, respectively, and therefore no evidence for locally enhanced dark matter.

Url:
DOI: 10.1111/j.1365-2966.2007.12513.x


Affiliations:


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<term>Angular momenta</term>
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<term>Belokurov</term>
<term>Binarity</term>
<term>Binary</term>
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<term>Kuiper</term>
<term>Kuiper symmetry test</term>
<term>Kuiper test</term>
<term>Larger volume</term>
<term>Majewski</term>
<term>Maximum differences</term>
<term>Metallicity</term>
<term>Middle plot</term>
<term>Minimum value</term>
<term>Mnras</term>
<term>Models</term>
<term>More stars</term>
<term>Neighbourhood</term>
<term>Newberg</term>
<term>Null hypothesis</term>
<term>Olsen</term>
<term>Orbits</term>
<term>Orphan stream</term>
<term>Outer halo</term>
<term>Overdensities</term>
<term>Overdensity</term>
<term>Parallax</term>
<term>Photometric</term>
<term>Photometric distances</term>
<term>Proper motions</term>
<term>Radial velocity</term>
<term>Rvlsr</term>
<term>Sdss</term>
<term>Seabroke</term>
<term>Seabroke gilmore</term>
<term>Single stars</term>
<term>Solar motion</term>
<term>Solar neighborhood</term>
<term>Solar neighbourhood</term>
<term>Solid histogram</term>
<term>Solid line</term>
<term>Space velocities</term>
<term>Spectroscopic</term>
<term>Spectroscopic binaries</term>
<term>Steinmetz</term>
<term>Stellar</term>
<term>Stellar density</term>
<term>Stellar populations</term>
<term>Stream stars</term>
<term>Strong clumping</term>
<term>Substructure</term>
<term>Sun</term>
<term>Thick disc</term>
<term>Thin disc</term>
<term>Tidal</term>
<term>Tidal stream</term>
<term>Tidal streams</term>
<term>Ulsr</term>
<term>Velocity distribution function</term>
<term>Velocity distribution functions</term>
<term>Velocity space</term>
<term>Vertical distribution</term>
<term>Vertical lines</term>
<term>Virgo overdensity</term>
<term>Wlos</term>
<term>Wlos distribution</term>
<term>Wlsr</term>
<term>Wlsr distribution</term>
<term>Wlsr symmetry</term>
<term>Wlsr wlsr</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr">
<term>Cinématique</term>
<term>Disque galactique</term>
<term>Dynamique</term>
<term>Espace vitesse</term>
<term>Etoile géante</term>
<term>Etoile naine</term>
<term>Fonction distribution vitesse</term>
<term>Formation galaxies</term>
<term>Galaxies disques</term>
<term>Galaxies naines</term>
<term>Matière sombre</term>
<term>Modèle</term>
<term>Orbite</term>
<term>Répartition verticale</term>
<term>Soleil</term>
<term>Structure galaxies</term>
<term>Vitesse radiale</term>
<term>Voisinage solaire</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en">
<term>2mass</term>
<term>Absolute magnitude</term>
<term>Angular momenta</term>
<term>Asymmetry</term>
<term>Belokurov</term>
<term>Binarity</term>
<term>Binary</term>
<term>Binney</term>
<term>Black dots</term>
<term>Bottom panel</term>
<term>Bottom plot</term>
<term>Centre</term>
<term>Chiba</term>
<term>Chiba yoshii</term>
<term>Coherent kinematics</term>
<term>Coherent streams</term>
<term>Coravel</term>
<term>Coravel dwarf</term>
<term>Coravel giants</term>
<term>Data release</term>
<term>Dehnen</term>
<term>Dehnen binney</term>
<term>Denis</term>
<term>Disc</term>
<term>Dynamical</term>
<term>Dynamical streams</term>
<term>Eld</term>
<term>Error distribution</term>
<term>Freese</term>
<term>Galactic</term>
<term>Galactic disc</term>
<term>Galactic plane</term>
<term>Galactic rotation</term>
<term>Gilmore</term>
<term>Halo</term>
<term>Helmi</term>
<term>Hipparcos</term>
<term>Histogram</term>
<term>Homann</term>
<term>Inner halo</term>
<term>Input catalogue</term>
<term>Journal compilation</term>
<term>Juric</term>
<term>Kinematic</term>
<term>Kinematics</term>
<term>Kpc3</term>
<term>Kuiper</term>
<term>Kuiper symmetry test</term>
<term>Kuiper test</term>
<term>Larger volume</term>
<term>Majewski</term>
<term>Maximum differences</term>
<term>Metallicity</term>
<term>Middle plot</term>
<term>Minimum value</term>
<term>Mnras</term>
<term>More stars</term>
<term>Neighbourhood</term>
<term>Newberg</term>
<term>Null hypothesis</term>
<term>Olsen</term>
<term>Orphan stream</term>
<term>Outer halo</term>
<term>Overdensities</term>
<term>Overdensity</term>
<term>Parallax</term>
<term>Photometric</term>
<term>Photometric distances</term>
<term>Proper motions</term>
<term>Rvlsr</term>
<term>Sdss</term>
<term>Seabroke</term>
<term>Seabroke gilmore</term>
<term>Single stars</term>
<term>Solar motion</term>
<term>Solar neighbourhood</term>
<term>Solid histogram</term>
<term>Solid line</term>
<term>Space velocities</term>
<term>Spectroscopic</term>
<term>Spectroscopic binaries</term>
<term>Steinmetz</term>
<term>Stellar</term>
<term>Stellar density</term>
<term>Stellar populations</term>
<term>Stream stars</term>
<term>Strong clumping</term>
<term>Substructure</term>
<term>Thick disc</term>
<term>Thin disc</term>
<term>Tidal</term>
<term>Tidal stream</term>
<term>Tidal streams</term>
<term>Ulsr</term>
<term>Velocity distribution functions</term>
<term>Vertical lines</term>
<term>Virgo overdensity</term>
<term>Wlos</term>
<term>Wlos distribution</term>
<term>Wlsr</term>
<term>Wlsr distribution</term>
<term>Wlsr symmetry</term>
<term>Wlsr wlsr</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">We have searched for in‐falling stellar streams on to the local Milky Way disc in the CORrelation RAdial VELocities (CORAVEL) and RAdial Velocity Experiment (RAVE) surveys. The CORAVEL survey consists of local dwarf stars (Nördstrom et al. Geneva–Copenhagen survey) and local Famaey et al. giant stars. We select RAVE stars with radial velocities that are sensitive to the Galactic vertical space velocity (Galactic latitude b < −45°). Kuiper statistics have been employed to test the symmetry of the Galactic vertical velocity distribution functions in these samples for evidence of a net vertical flow that could be associated with a (tidal?) stream of stars with vertically coherent kinematics. In contrast to the ‘Field of Streams’ found in the outer halo, we find that the local volumes of the solar neighbourhood sampled by the CORAVEL dwarfs (complete within ∼3 × 10−4 kpc3), CORAVEL giants (complete within ∼5 × 10−2 kpc3) and RAVE (5–15 per cent complete within ∼8 kpc3) are devoid of any vertically coherent streams containing hundreds of stars. This is sufficiently sensitive to allow our RAVE sample to rule out the passing of the tidal stream of the disrupting Sagittarius (Sgr) dwarf galaxy through the solar neighbourhood. This agrees with the most‐recent determinations of its orbit and dissociates it from the Helmi et al. halo stream. Our constraints on the absence of the Sgr stream near the Sun could prove a useful tool for discriminating between Galactic potential models. The lack of a net vertical flow through the solar neighbourhood in the CORAVEL giants and RAVE samples argues against the Virgo overdensity crossing the disc near the Sun. There are no vertical streams in the CORAVEL giants and RAVE samples with stellar densities ≳1.6 × 104 and 1.5 × 103 stars kpc−3, respectively, and therefore no evidence for locally enhanced dark matter.</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>Suisse</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>Canton de Bâle-Ville</li>
<li>District de Karlsruhe</li>
<li>Grand Est</li>
<li>Groningue (province)</li>
<li>Maryland</li>
<li>Oxfordshire</li>
</region>
<settlement>
<li>Bâle</li>
<li>Cambridge</li>
<li>Groningue (ville)</li>
<li>Heidelberg</li>
<li>Oxford</li>
<li>Strasbourg</li>
</settlement>
<orgName>
<li>Université d'Oxford</li>
<li>Université de Bâle</li>
<li>Université de Cambridge</li>
<li>Université de Groningue</li>
</orgName>
</list>
<tree>
<noCountry>
<name sortKey="Gibson, B" sort="Gibson, B" uniqKey="Gibson B" first="B." last="Gibson">B. Gibson</name>
</noCountry>
<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="Binney, J" sort="Binney, J" uniqKey="Binney J" first="J." last="Binney">J. Binney</name>
<name sortKey="Gilmore, G" sort="Gilmore, G" uniqKey="Gilmore G" first="G." last="Gilmore">G. Gilmore</name>
<name sortKey="Seabroke, G M" sort="Seabroke, G M" uniqKey="Seabroke G" first="G. M." last="Seabroke">G. M. Seabroke</name>
<name sortKey="Smith, M C" sort="Smith, M C" uniqKey="Smith M" first="M. C." last="Smith">M. C. Smith</name>
</country>
<country name="Allemagne">
<noRegion>
<name sortKey="Siebert, A" sort="Siebert, A" uniqKey="Siebert A" first="A." last="Siebert">A. Siebert</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="Steinmetz, M" sort="Steinmetz, M" uniqKey="Steinmetz M" first="M." last="Steinmetz">M. Steinmetz</name>
</country>
<country name="France">
<region name="Grand Est">
<name sortKey="Bienayme, O" sort="Bienayme, O" uniqKey="Bienayme O" first="O." last="Bienaymé">O. Bienaymé</name>
</region>
</country>
<country name="Australie">
<noRegion>
<name sortKey="Bland Awthorn, J" sort="Bland Awthorn, J" uniqKey="Bland Awthorn J" first="J." last="Bland-Hawthorn">J. Bland-Hawthorn</name>
</noRegion>
<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="Watson, F G" sort="Watson, F G" uniqKey="Watson F" first="F. G." last="Watson">F. G. Watson</name>
<name sortKey="Williams, M" sort="Williams, M" uniqKey="Williams M" first="M." last="Williams">M. Williams</name>
</country>
<country name="Suisse">
<region name="Canton de Bâle-Ville">
<name sortKey="Grebel, E K" sort="Grebel, E K" uniqKey="Grebel E" first="E. K." last="Grebel">E. K. Grebel</name>
</region>
</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>
<name sortKey="Pe Arrubia, J" sort="Pe Arrubia, J" uniqKey="Pe Arrubia J" first="J." last="Pe Arrubia">J. Pe Arrubia</name>
</country>
<country name="États-Unis">
<region name="Maryland">
<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>
</region>
</country>
<country name="Slovénie">
<noRegion>
<name sortKey="Zwitter, T" sort="Zwitter, T" uniqKey="Zwitter T" first="T." last="Zwitter">T. Zwitter</name>
</noRegion>
</country>
</tree>
</affiliations>
</record>

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