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

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Eric F. Bell1, Daniel H. McIntosh2, Marco Barden1, Christian Wolf3, John A. R. Caldwell4, Hans-Walter Rix1, Steven V. W. Beckwith4, Andrea Borch1, Boris Häussler1, Knud Jahnke5, Shardha Jogee4, Klaus Meisenheimer1, Chien Peng6, Sebastian F. Sanchez5, Rachel S. Somerville4 and Lutz Wisotzki5

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We have used the 30' × 30' Hubble Space Telescope image mosaic from the Galaxy Evolution from Morphology and Spectral energy distributions (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 down to MV - 5 log h lesssim -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.


Subject headings

galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: general; galaxies: stellar content


Dates

Issue 1 (2004 January 1)

Received 2003 August 15, accepted for publication 2003 November 14

Published 2003 December 9



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