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The Color-Dependent Frequency of XUV Disks In Low-Mass E/S0s

Published online by Cambridge University Press:  11 July 2011

M. Koleva ,
Ph. Prugniel ,
I. Vauglin ,
A.J. Moffett ,
S.J. Kannappan ,
A.J. Baker  and
S. Laine
A.J. Moffett
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina, USA
S.J. Kannappan
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina, USA
A.J. Baker
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina, USA
S. Laine
Affiliation:
Spitzer Science Center, California Institute of Technology, USA
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Abstract

We identify a high frequency of Type 1 XUV disks, reflecting recent outer-disk star formation, in a sample of 31 E/S0s with stellar masses primarily below M∗ ~ 4 × 1010 M⊙. Our ~40% identification rate is roughly twice the 20% fraction reported for late-type galaxies. Intriguingly, in the dwarf mass regime (below M∗ ~ 5 × 109 M⊙) where gas fractions increase, Type 1 XUV disks occur in ~70% of red-sequence E/S0s but only ~20% of blue-sequence E/S0s, a population recently linked to active disk rebuilding, especially in the dwarf regime. Our statistics are preliminary, but could indicate that Type 1 XUV disks in dwarf E/S0s are primarily related to weak/inefficient outer-disk star formation rather than to star formation capable of driving substantial disk growth.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 48: CRAL-2010 A Universe of Dwarf Galaxies , 2011 , pp. 419 - 421
Copyright
© EAS, EDP Sciences, 2011

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References

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