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Ultraviolet Emission from Star-formation in Selected Gas-rich Early-type Galaxies

Published online by Cambridge University Press:  05 March 2015

Lerothodi L. Leeuw
Lerothodi L. Leeuw*
Affiliation:
College of Graduate Studies, UNISA, P. O. Box 392, UNISA Pretoria, 0003, South Africa SETI Institute, 189 Bernardo Avenue, Suite 100, Mountain View, CA 94043, USA email: lerothodi@alum.mit.edu
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Abstract

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We present GALEX ultraviolet (UV) emission results of star-formation in a small sample of nearby, gas-rich early-type galaxies. The first observational evidence of star-formation in this sample was presented by Leeuw et al.2008, using 350 μm continuum data. The measured far-infrared (far-IR) excess of these galaxies showed that the most likely and dominant heating source of the observed 350 μm continuum emission from dust is star-formation, that could have been triggered by an accretion or merger event. Consistent with starbursts that are less than 1 Gyr (e.g., Kaviraj 2010), the GALEX near-UV (NUV) minus SDSS r-band emission of the galaxies is < 5.5. The UV results corroborate those of mid-IR to radio data for the sample.

Keywords

galaxies: elliptical and lenticularcDgalaxies: evolutiongalaxies: ISMinfrared: generalsubmillimeterultraviolet: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 126
Copyright
Copyright © International Astronomical Union 2015 

References

Kaviraj, S. 2010, MNRAS, 408, 170CrossRefGoogle Scholar
Leeuw, L. L., Davidson, J., Dowell, C. D., & Matthews, H. E. 2008, ApJ, 677, 249CrossRefGoogle Scholar
Leeuw, L. L., Bregman, J., Davidson, J., Temi, P., & Im, S. S. 2011, in: Carignan, C., Combes, F. & Freeman, K. C. (eds.), Tracing the Ancestry of Galaxies (on the land of our ancestors), Proceedings of the International Astronomical Union, IAU Symposium, Volume 277, p. 30Google Scholar