Hostname: page-component-848d4c4894-8kt4b Total loading time: 0 Render date: 2024-06-16T18:24:15.829Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  11 July 2011

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
Get access

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 × 1010M. Our ~40% identification rate is roughly twice the 20% fraction reported for late-type galaxies. Intriguingly, in the dwarf mass regime (below M ~ 5 × 109M) 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
Copyright
© EAS, EDP Sciences, 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Gil de Paz, A., et al., 2005, ApJ, 627, L29CrossRef
Jansen, R.A., Fabricant, D., Franx, M., & Caldwell, N., 2000a, ApJS, 126, 331CrossRef
Kannappan, S.J., Guie, J.M., & Baker, A.J., 2009, AJ, 138, 579 (KGB)CrossRef
Moffett, A.J., Kannappan, S.J., Laine, S., et al., 2010, in ASP Conf. Ser., 423, 346
Thilker, D., et al., 2007, ApJS, 173, 538 (T07)
Thilker, D., et al., 2007, ApJS, 173, 538 (T07)