The Ages of Very Red Spheroids and Bulges and Associated Disks at Redshifts z ~ 0.8

Details The Ages of Very Red Spheroids and Bulges and Associated Disks at Redshifts z ~ 0.8 The Ages of Very Red Spheroids and Bulges and Associated Disks at Redshifts z ~ 0.8

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9204k&link_type=abstract

HST Proposal ID #9204

Mathematics

Logic

Hst Proposal Id #9204 Cosmology

Scientific paper

The ages of spheroids remain an important mystery amenable to direct attack with HST color images. Hierarchical galaxy formation models predict that bulges are redder than associated disks and that field spheroids should be younger {bluer} and have larger age scatter than their older, more coeval, cluster cousins. Using Keck and HST data, van Dokkum et al. have measured the galaxy half-light colors for 30 cluster E/S0's at z 0.8 and find very red colors with small scatter. For 26 field galaxies at z 0.7 - 1, we have measured separate colors for bulges and disks and find that the disks are indeed all bluer than the bulges. To our surprise, the field bulges are as red or redder than the cluster galaxies. These results are major steps forward, but unfortunately, the high-redshift field bulges are so red that the exposures were too shallow in the bluer band {2800s in V} to yield positive measures of color scatter for direct comparison to cluster results. Moreover, our surprise may be explained if the color of cluster bulges are redder than their galaxy's half-light color {which may be contaminated by bluer disks}. We aim to remedy both problems with this archive proposal and thereby answer the cosmologically important question: What are the relative color {age} distributions of spheroids, bulges, and disks among high redshift z 0.8 galaxies in both field and cluster environments?

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