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The kinematic footprints of five stellar streams in Andromeda's halo

Identifieur interne : 002E34 ( PascalFrancis/Curation ); précédent : 002E33; suivant : 002E35

The kinematic footprints of five stellar streams in Andromeda's halo

Auteurs : S. C. Chapman [Royaume-Uni, Canada] ; R. Ibata [France] ; M. Irwin [Royaume-Uni] ; A. Koch [États-Unis] ; B. Letarte [États-Unis] ; N. Martin [Allemagne] ; M. Collins [Royaume-Uni] ; G. F. Lewis [Australie] ; A. Mcconnachie [Canada] ; J. Penarrubia [Canada] ; R. M. Rich [États-Unis] ; D. Trethewey [Royaume-Uni] ; A. Ferguson [Royaume-Uni] ; A. Huxor [Royaume-Uni] ; N. Tanvir [Royaume-Uni]

Source :

RBID : Pascal:08-0513603

Descripteurs français

English descriptors

Abstract

We present a spectroscopic analysis of five stellar streams ('A', 'B', 'Cr', 'Cp' and 'D') as well as the extended star cluster, EC4, which lies within Stream 'C', all discovered in the halo of M31 from our Canada-France-Hawaii Telescope/MegaCam survey. These spectroscopic results were initially serendipitous, making use of our existing observations from the DEep Imaging Multi-Object Spectrograph mounted on the Keck II telescope, and thereby emphasizing the ubiquity of tidal streams that account for ∼70 per cent of the M31 halo stars in the targeted fields. Subsequent spectroscopy was then procured in Stream 'C' and Stream 'D' to trace the velocity gradient along the streams. Nine metal-rich ([Fe/H] ∼ -0.7) stars at vhel = -349.5 km s-1v,corr ∼ 5.1 ± 2.5km s-1 are proposed as a serendipitous detection of Stream'Cr', with follow-up kinematic identification at a further point along the stream. Seven metal-poor ([Fe/H] ∼-1.3) stars confined to a narrow, 15 km s-1 velocity bin centred at uhel = -285.6, σv,corr = 4.3+1.7-1.4 km s-1 represent a kinematic detection of Stream 'Cp', again with follow-up kinematic identification further along the stream. For the cluster EC4, candidate member stars with average [Fe/H] ∼-1.4, are found at vhel = -282 suggesting it could be related to Stream 'Cp'. No similarly obvious cold kinematic candidate is found for Stream 'D', although candidates are proposed in both of two spectroscopic pointings along the stream (both at ∼ -400 km s-1). Spectroscopy near the edge of Stream 'B' suggests a likely kinematic detection at vhel ∼ -330, σv,corr ∼ 6.9 km s-1, while a candidate kinematic detection of Stream 'A' is found (plausibly associated to M33 rather than M31) with vhel ∼ -170, σv,corr = 12.5 km s-1. The low dispersion of the streams in kinematics, physical thickness and metallicity makes it hard to reconcile with a scenario whereby these stream structures as an ensemble are related to the giant southern stream. We conclude that the M31 stellar halo is largely made up of multiple kinematically cold streams.
pA  
A01 01  1    @0 0035-8711
A02 01      @0 MNRAA4
A03   1    @0 Mon. Not. R. Astron. Soc.
A05       @2 390
A06       @2 4
A08 01  1  ENG  @1 The kinematic footprints of five stellar streams in Andromeda's halo
A11 01  1    @1 CHAPMAN (S. C.)
A11 02  1    @1 IBATA (R.)
A11 03  1    @1 IRWIN (M.)
A11 04  1    @1 KOCH (A.)
A11 05  1    @1 LETARTE (B.)
A11 06  1    @1 MARTIN (N.)
A11 07  1    @1 COLLINS (M.)
A11 08  1    @1 LEWIS (G. F.)
A11 09  1    @1 MCCONNACHIE (A.)
A11 10  1    @1 PENARRUBIA (J.)
A11 11  1    @1 RICH (R. M.)
A11 12  1    @1 TRETHEWEY (D.)
A11 13  1    @1 FERGUSON (A.)
A11 14  1    @1 HUXOR (A.)
A11 15  1    @1 TANVIR (N.)
A14 01      @1 Institute of Astronomy, Madingley Road @2 Cambridge CB3 OHA @3 GBR @Z 1 aut. @Z 3 aut. @Z 7 aut. @Z 12 aut.
A14 02      @1 Department of Physics and Astronomy, University of Victoria @2 Victoria, BC V8P 1A1 @3 CAN @Z 1 aut. @Z 9 aut. @Z 10 aut.
A14 03      @1 Observatoire de Strasbourg, 11, rue de l'Université @2 67000 Strasbourg @3 FRA @Z 2 aut.
A14 04      @1 Department of Physics and Astronomy, University of California @2 Los Angles, LA California @3 USA @Z 4 aut. @Z 11 aut.
A14 05      @1 California Institute of Technology @2 Pasadena, CA 91125 @3 USA @Z 5 aut.
A14 06      @1 Max-Planck-Institut für Astronomie, Königstuhl 17 @2 69117 Heidelberg @3 DEU @Z 6 aut.
A14 07      @1 Institute of Astronomy, School of Physics, A29, University of Sydney @2 NSW 2006 @3 AUS @Z 8 aut.
A14 08      @1 Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill @2 Edinburgh EH9 3HJ @3 GBR @Z 13 aut. @Z 14 aut.
A14 09      @1 Department of Physics and Astronomy, University of Leicester @2 Leicester LEI 7RH @3 GBR @Z 15 aut.
A20       @1 1437-1452
A21       @1 2008
A23 01      @0 ENG
A43 01      @1 INIST @2 2067 @5 354000185940450130
A44       @0 0000 @1 © 2008 INIST-CNRS. All rights reserved.
A45       @0 3/4 p.
A47 01  1    @0 08-0513603
A60       @1 P
A61       @0 A
A64 01  1    @0 Monthly Notices of the Royal Astronomical Society
A66 01      @0 GBR
C01 01    ENG  @0 We present a spectroscopic analysis of five stellar streams ('A', 'B', 'Cr', 'Cp' and 'D') as well as the extended star cluster, EC4, which lies within Stream 'C', all discovered in the halo of M31 from our Canada-France-Hawaii Telescope/MegaCam survey. These spectroscopic results were initially serendipitous, making use of our existing observations from the DEep Imaging Multi-Object Spectrograph mounted on the Keck II telescope, and thereby emphasizing the ubiquity of tidal streams that account for ∼70 per cent of the M31 halo stars in the targeted fields. Subsequent spectroscopy was then procured in Stream 'C' and Stream 'D' to trace the velocity gradient along the streams. Nine metal-rich ([Fe/H] ∼ -0.7) stars at vhel = -349.5 km s-1v,corr ∼ 5.1 ± 2.5km s-1 are proposed as a serendipitous detection of Stream'Cr', with follow-up kinematic identification at a further point along the stream. Seven metal-poor ([Fe/H] ∼-1.3) stars confined to a narrow, 15 km s-1 velocity bin centred at uhel = -285.6, σv,corr = 4.3+1.7-1.4 km s-1 represent a kinematic detection of Stream 'Cp', again with follow-up kinematic identification further along the stream. For the cluster EC4, candidate member stars with average [Fe/H] ∼-1.4, are found at vhel = -282 suggesting it could be related to Stream 'Cp'. No similarly obvious cold kinematic candidate is found for Stream 'D', although candidates are proposed in both of two spectroscopic pointings along the stream (both at ∼ -400 km s-1). Spectroscopy near the edge of Stream 'B' suggests a likely kinematic detection at vhel ∼ -330, σv,corr ∼ 6.9 km s-1, while a candidate kinematic detection of Stream 'A' is found (plausibly associated to M33 rather than M31) with vhel ∼ -170, σv,corr = 12.5 km s-1. The low dispersion of the streams in kinematics, physical thickness and metallicity makes it hard to reconcile with a scenario whereby these stream structures as an ensemble are related to the giant southern stream. We conclude that the M31 stellar halo is largely made up of multiple kinematically cold streams.
C02 01  3    @0 001E03
C03 01  X  FRE  @0 Cinématique stellaire @5 26
C03 01  X  ENG  @0 Stellar kinematics @5 26
C03 01  X  SPA  @0 Cinematica estelar @5 26
C03 02  3  FRE  @0 Amas stellaire @5 27
C03 02  3  ENG  @0 Star clusters @5 27
C03 03  3  FRE  @0 Spectrométrie @5 28
C03 03  3  ENG  @0 Spectroscopy @5 28
C03 04  X  FRE  @0 Etoile membre @5 29
C03 04  X  ENG  @0 Member star @5 29
C03 04  X  SPA  @0 Estrella miembro @5 29
C03 05  X  FRE  @0 Métallicité @5 30
C03 05  X  ENG  @0 Metallicity @5 30
C03 05  X  SPA  @0 Metalicidad @5 30
C03 06  X  FRE  @0 Halo galaxies @5 31
C03 06  X  ENG  @0 Galaxy halo @5 31
C03 06  X  SPA  @0 Halo galaxia @5 31
C03 07  3  FRE  @0 Galaxies @5 32
C03 07  3  ENG  @0 Galaxies @5 32
N21       @1 336
N44 01      @1 OTO
N82       @1 OTO

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Pascal:08-0513603

Le document en format XML

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<s1>Department of Physics and Astronomy, University of Leicester</s1>
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<title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title>
<title level="j" type="abbreviated">Mon. Not. R. Astron. Soc.</title>
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<title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title>
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<term>Galaxies</term>
<term>Galaxy halo</term>
<term>Member star</term>
<term>Metallicity</term>
<term>Spectroscopy</term>
<term>Star clusters</term>
<term>Stellar kinematics</term>
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<term>Cinématique stellaire</term>
<term>Amas stellaire</term>
<term>Spectrométrie</term>
<term>Etoile membre</term>
<term>Métallicité</term>
<term>Halo galaxies</term>
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<div type="abstract" xml:lang="en">We present a spectroscopic analysis of five stellar streams ('A', 'B', 'Cr', 'Cp' and 'D') as well as the extended star cluster, EC4, which lies within Stream 'C', all discovered in the halo of M31 from our Canada-France-Hawaii Telescope/MegaCam survey. These spectroscopic results were initially serendipitous, making use of our existing observations from the DEep Imaging Multi-Object Spectrograph mounted on the Keck II telescope, and thereby emphasizing the ubiquity of tidal streams that account for ∼70 per cent of the M31 halo stars in the targeted fields. Subsequent spectroscopy was then procured in Stream 'C' and Stream 'D' to trace the velocity gradient along the streams. Nine metal-rich ([Fe/H] ∼ -0.7) stars at v
<sub>hel</sub>
= -349.5 km s
<sup>-1</sup>
<sub>v,corr</sub>
∼ 5.1 ± 2.5km s
<sup>-1</sup>
are proposed as a serendipitous detection of Stream'Cr', with follow-up kinematic identification at a further point along the stream. Seven metal-poor ([Fe/H] ∼-1.3) stars confined to a narrow, 15 km s
<sup>-1</sup>
velocity bin centred at u
<sub>hel</sub>
= -285.6, σ
<sub>v,corr</sub>
= 4.3
<sup>+1.7</sup>
<sub>-1.4</sub>
km s
<sup>-1</sup>
represent a kinematic detection of Stream 'Cp', again with follow-up kinematic identification further along the stream. For the cluster EC4, candidate member stars with average [Fe/H] ∼-1.4, are found at v
<sub>hel</sub>
= -282 suggesting it could be related to Stream 'Cp'. No similarly obvious cold kinematic candidate is found for Stream 'D', although candidates are proposed in both of two spectroscopic pointings along the stream (both at ∼ -400 km s
<sup>-1</sup>
). Spectroscopy near the edge of Stream 'B' suggests a likely kinematic detection at v
<sub>hel</sub>
∼ -330, σ
<sub>v,corr</sub>
∼ 6.9 km s
<sup>-1</sup>
, while a candidate kinematic detection of Stream 'A' is found (plausibly associated to M33 rather than M31) with v
<sub>hel</sub>
∼ -170, σ
<sub>v,corr</sub>
= 12.5 km s
<sup>-1</sup>
. The low dispersion of the streams in kinematics, physical thickness and metallicity makes it hard to reconcile with a scenario whereby these stream structures as an ensemble are related to the giant southern stream. We conclude that the M31 stellar halo is largely made up of multiple kinematically cold streams.</div>
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<s0>We present a spectroscopic analysis of five stellar streams ('A', 'B', 'Cr', 'Cp' and 'D') as well as the extended star cluster, EC4, which lies within Stream 'C', all discovered in the halo of M31 from our Canada-France-Hawaii Telescope/MegaCam survey. These spectroscopic results were initially serendipitous, making use of our existing observations from the DEep Imaging Multi-Object Spectrograph mounted on the Keck II telescope, and thereby emphasizing the ubiquity of tidal streams that account for ∼70 per cent of the M31 halo stars in the targeted fields. Subsequent spectroscopy was then procured in Stream 'C' and Stream 'D' to trace the velocity gradient along the streams. Nine metal-rich ([Fe/H] ∼ -0.7) stars at v
<sub>hel</sub>
= -349.5 km s
<sup>-1</sup>
<sub>v,corr</sub>
∼ 5.1 ± 2.5km s
<sup>-1</sup>
are proposed as a serendipitous detection of Stream'Cr', with follow-up kinematic identification at a further point along the stream. Seven metal-poor ([Fe/H] ∼-1.3) stars confined to a narrow, 15 km s
<sup>-1</sup>
velocity bin centred at u
<sub>hel</sub>
= -285.6, σ
<sub>v,corr</sub>
= 4.3
<sup>+1.7</sup>
<sub>-1.4</sub>
km s
<sup>-1</sup>
represent a kinematic detection of Stream 'Cp', again with follow-up kinematic identification further along the stream. For the cluster EC4, candidate member stars with average [Fe/H] ∼-1.4, are found at v
<sub>hel</sub>
= -282 suggesting it could be related to Stream 'Cp'. No similarly obvious cold kinematic candidate is found for Stream 'D', although candidates are proposed in both of two spectroscopic pointings along the stream (both at ∼ -400 km s
<sup>-1</sup>
). Spectroscopy near the edge of Stream 'B' suggests a likely kinematic detection at v
<sub>hel</sub>
∼ -330, σ
<sub>v,corr</sub>
∼ 6.9 km s
<sup>-1</sup>
, while a candidate kinematic detection of Stream 'A' is found (plausibly associated to M33 rather than M31) with v
<sub>hel</sub>
∼ -170, σ
<sub>v,corr</sub>
= 12.5 km s
<sup>-1</sup>
. The low dispersion of the streams in kinematics, physical thickness and metallicity makes it hard to reconcile with a scenario whereby these stream structures as an ensemble are related to the giant southern stream. We conclude that the M31 stellar halo is largely made up of multiple kinematically cold streams.</s0>
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