GEMS Imaging of Red Sequence Galaxies at z~0.7: Dusty or Old?

Abstract

We have used the 30'x30' Hubble Space Telescope image mosaic from the Galaxy Evolution from Morphology and SEDs (GEMS) project in conjunction with the COMBO-17 deep photometric redshift survey to define a sample of nearly 1500 galaxies with 0.65 < z < 0.75. With this sample, we can study the distribution of rest-frame V-band morphologies more than 6 Gyr ago, without differential bandpass shifting and surface brightness dimming across this narrow redshift slice. Focusing on red-sequence galaxies at z ~ 0.7, we find that 85% of their combined rest-frame V-band luminosity density comes from visually-classified E/S0/Sa galaxies (at V-band magnitudes brighter than -19.5). Similar results are obtained if automated classifiers are used. This fraction is identical to that found at the present day, and is biased by less than 10% by large scale structure and the morphology-density relation. Under the assumption that peculiar and edge-on disk galaxies are red by virtue of their dust content, we find that less than 13% of the total rest-frame V-band luminosity of the z ~ 0.7 red galaxy population is from dusty galaxies.

arXiv commentApJL, in press. For a version of this paper with a full-resolution figure visit http://www.mpia-hd.mpg.de/homes/bell/res.html The GEMS collaboration website is http://www.mpia-hd.mpg.de/GEMS/gems.htm Added discussion of the implications of our results for hierarchical and monolithic formation scenarios for early-type galaxies

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