Color Gradients in Elliptical Galaxies at z = 0.5: , An Indicator of Galaxy Formation Processes

Details Color Gradients in Elliptical Galaxies at z = 0.5: , An Indicator of Galaxy Formation Processes Color Gradients in Elliptical Galaxies at z = 0.5: , An Indicator of Galaxy Formation Processes

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8766p&link_type=abstract

HST Proposal ID #8766

Physics

Hst Proposal Id #8766 Cosmology

Scientific paper

We propose to make a direct comparison of the frequency and size of color gradients in cluster elliptical galaxies at z 0 and z 0.5 to constrain the relative roles of merging and monolithic collapse on the galaxy formation process. Color gradients are ubiquitous in elliptical galaxies in the local universe, and are the origin of 20-50 Local studies of color {and line-strength} gradients could be explained by metallicity and/or age gradients in the underlying stellar populations, but offer few clues as to how they could have formed. HST observations at z 0.5, however, can provide direct insight into the origin{s} of these population gradients: the gradients steepen with redshift if dissipationless merging dominates; flatten if dissipative, gas-rich merging dominates; or remain roughly constant if monolithic collapse {at early epochs} created the population gradients. In order to test these predictions, we will utilize both ground-based and HST data: ground-based observations in {U-V} at z 0 are a nearly exact match in color and physical resolution to HST archival observations in {555-814} of three clusters at z 0.5. Color gradients are shown to be easily measured with HST at z 0.5, but they have yet to be studied in a systematic manner. Funding is requested here primarily to support a Harvard undergraduate to reduce, analyze, and publish the results of the study.

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