IAU01574
Presentation type requested: EITHER
THE SPACE DENSITY OF FIELD GALAXIES IN THE ACS-GTO IMAGES.
Nicholas J Cross
Johns Hopkins University
The Advanced Camera for Surveys (ACS) is the latest instrument on the Hubble Space Telescope and has 10 times the survey power of WFPC2. We use data from Gaurenteed Time Observations (GTO) to measure the space density of galaxies at z=0.75 as a function of Absolute Magnitude and Surface Brightness to eliminate surface brightness dependences. We integrate this function in the surface brightness direction to give the z=0 B band luminosity function and compare to local surveys such as the 2dFGRS and SDSS and compare with models of luminosity evolution. We quantify the morphological mixture and the merger rate at z=0.75 to measure the evolution of galaxy numbers.
Benitez Narciso , Gronwall Caryl , Blakeslee John P, Menanteau Felipe , Bouwens Rychard , The ACS Science Team
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