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B. D. Siana, H. I. Teplitz, R. Chary, J. W. Colbert (Spitzer Science Center), T. M. Brown, D. F. de Mello, H. C. Ferguson (Space Telescope Science Institute), C. Conselice (California Institute of Technology), J. P. Gardner (Goddard Space Flight Center), F. Menanteau (Johns Hopkins University), M. E. Dickinson (National Optical Astronomy Observatory)
We present far-UV (1500Å) imaging of the Ultra Deep Field (UDF) taken with the Solar Blind Channel of the Advanced Camera for Surveys (ACS/SBC) on HST. Combined with data from a previous campaign covering the Hubble Deep Field North (HDF-N), we detect more than 200 galaxies over 12 arcmin2 with Far-UV mags to m(AB)=29. The derived number counts extend nearly four magnitudes fainter than the GALEX ultra-deep fields. We use Spitzer infrared photometry from the GOODS Legacy survey to examine the F(IR)/F(UV) vs. \beta relation. We find that this relation, although derived with a local sample, holds for starburst galaxies at moderate redshift between 0.3-0.9. We detect about half of all morphologically selected ellipticals with z<0.8, indicating significant ongoing star-formation at z<1 in this population. Furthermore, our detection rate of ellipticals is correlated with their dispersion in optical color across the galaxy with nearly all of the "blue core" ellipticals (\delta(V-I)>0.05) detected in the far-UV.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.