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Stellar Kinematics of the Isolated Dwarf Irregular WLM

Published online by Cambridge University Press:  11 July 2011

M. Koleva ,
Ph. Prugniel ,
I. Vauglin ,
R. Leaman ,
K. Venn ,
A. Cole ,
R. Ibata ,
A. McConnachie ,
A. Brooks  and
M. Irwin
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R. Leaman
Affiliation:
Univ. of Victoria
K. Venn
Affiliation:
Univ. of Victoria
A. Cole
Affiliation:
Univ. of Tasmania
R. Ibata
Affiliation:
Observatoire de Strasbourg
A. McConnachie
Affiliation:
HIA-NRC
A. Brooks
Affiliation:
CIT
M. Irwin
Affiliation:
Institute of Astronomy
E. Skillman
Affiliation:
Univ. of Minnesota
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Abstract

Chemical abundances and radial velocities for ∼210 stars in WLM, ∼130 new stars from DEIMOS spectroscopy, and 80 stars from Leaman et al. (2009) are presented. This sample shows that this isolated dwarf has chemically, dynamically, and spatially distinct stellar populations similar to the nearby dwarf spheroidals. The kinematics of the stars appear to be decoupled from the HI gas, which shows a higher rotational velocity profile. This thicker stellar configuration for a distant, isolated dwarf irregular may have implications for timescales of tidal transformation scenarios of infalling galaxies in the Local Group.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 48: CRAL-2010 A Universe of Dwarf Galaxies , 2011 , pp. 59 - 60
Copyright
© EAS, EDP Sciences, 2011

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References

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