Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342503r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #425.03; Bulletin of the American Astronomical Society, Vol. 41, p.252
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We use the SBC channel of ACS on board HST to image a sample of 24 quiescent early-type galaxies with GALEX UV photometry and SDSS spectroscopy. These galaxies were selected based on the detection of a far ultraviolet excess, but no optical signs of ongoing star formation (no H-alpha in the SDSS spectrum), and early-type morphology. F125LP (1500A rest) imaging reveals complex structure, including some cases of spiral morphology, in the UV emission of 18 of 24 of these galaxies. We propose that many early type galaxies that present far-UV emission may actually be undergoing low level star formation events, and that the traditional explanation of far-UV emission, hot HB stars, is actually responsible for the UV flux in only a minority of cases. We consider the implications for the growth in mass of early-type galaxies and the evolution of the red sequence.
Rich Robert Michael
Salim Samir
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