A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31

S. C. Chapman; R. Ibata; G. F. Lewis; A. M. N. Ferguson; M. Irwin; A. McConnachie; N. Tanvir

doi:10.1086/508599

A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31

S. C. Chapman, R. Ibata, G. F. Lewis, A. M. N. Ferguson, M. Irwin, A. McConnachie, N. Tanvir

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

We present evidence for a metal-poor, [Fe/H]~-1.4, σ=0.2 dex, stellar halo component detectable at radii from 10 to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample underlies the recently discovered extended rotating component and has no detected metallicity gradient. This discovery uses a large sample of 9861 radial velocities of red giant branch (RGB) stars obtained with the Keck II Telescope and DEIMOS spectrograph, with 827 stars with robust radial velocity measurements isolated kinematically to lie in the halo component primarily by windowing out the extended rotating component, which dominates the photometric profile of Andromeda out to

Original language	English
Pages (from-to)	255-266
Journal	Astrophysical Journal
Volume	653
Issue number	1
DOIs	https://doi.org/10.1086/508599
Publication status	Published - 1 Dec 2006

Keywords / Materials (for Non-textual outputs)

Galaxies: Evolution
galaxies: individual (Andromeda)
Galaxies: Spiral
Galaxies: Local Group

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10.1086/508599

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title = "A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31",

abstract = "We present evidence for a metal-poor, [Fe/H]~-1.4, σ=0.2 dex, stellar halo component detectable at radii from 10 to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample underlies the recently discovered extended rotating component and has no detected metallicity gradient. This discovery uses a large sample of 9861 radial velocities of red giant branch (RGB) stars obtained with the Keck II Telescope and DEIMOS spectrograph, with 827 stars with robust radial velocity measurements isolated kinematically to lie in the halo component primarily by windowing out the extended rotating component, which dominates the photometric profile of Andromeda out to ",

keywords = "Galaxies: Evolution, galaxies: individual (Andromeda), Galaxies: Spiral, Galaxies: Local Group",

author = "Chapman, {S. C.} and R. Ibata and Lewis, {G. F.} and Ferguson, {A. M. N.} and M. Irwin and A. McConnachie and N. Tanvir",

year = "2006",

month = dec,

day = "1",

doi = "10.1086/508599",

language = "English",

volume = "653",

pages = "255--266",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31

AU - Chapman, S. C.

AU - Ibata, R.

AU - Lewis, G. F.

AU - Ferguson, A. M. N.

AU - Irwin, M.

AU - McConnachie, A.

AU - Tanvir, N.

PY - 2006/12/1

Y1 - 2006/12/1

N2 - We present evidence for a metal-poor, [Fe/H]~-1.4, σ=0.2 dex, stellar halo component detectable at radii from 10 to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample underlies the recently discovered extended rotating component and has no detected metallicity gradient. This discovery uses a large sample of 9861 radial velocities of red giant branch (RGB) stars obtained with the Keck II Telescope and DEIMOS spectrograph, with 827 stars with robust radial velocity measurements isolated kinematically to lie in the halo component primarily by windowing out the extended rotating component, which dominates the photometric profile of Andromeda out to

AB - We present evidence for a metal-poor, [Fe/H]~-1.4, σ=0.2 dex, stellar halo component detectable at radii from 10 to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample underlies the recently discovered extended rotating component and has no detected metallicity gradient. This discovery uses a large sample of 9861 radial velocities of red giant branch (RGB) stars obtained with the Keck II Telescope and DEIMOS spectrograph, with 827 stars with robust radial velocity measurements isolated kinematically to lie in the halo component primarily by windowing out the extended rotating component, which dominates the photometric profile of Andromeda out to

KW - Galaxies: Evolution

KW - galaxies: individual (Andromeda)

KW - Galaxies: Spiral

KW - Galaxies: Local Group

U2 - 10.1086/508599

DO - 10.1086/508599

M3 - Article

SN - 0004-637X

VL - 653

SP - 255

EP - 266

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31

Abstract / Description of output

Keywords / Materials (for Non-textual outputs)

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