Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8564b&link_type=abstract
HST Proposal ID #8564
Computer Science
Hst Proposal Id #8564 Galaxies
Scientific paper
We propose far-ultraviolet observations of CL1358+62, a rich, well-studied cluster of galaxies at z =0.33. These observations will provide the first completely unambiguous measurement of far-UV emission in quiescent ellipticals at moderate redshift. Theoretically, the strength of far-UV emission {relative to flux at longer wavelengths} is the most rapidly evolving feature in elliptical galaxies. Models suggest that this ``UV upturn'' can change by a factor of 25 over a few Gyr, and it is expected to fade rapidly with increasing redshift. Surprisingly, the Faint Object Camera {FOC} found strong far-UV emission in four elliptical galaxies at z=0.375, suggesting no evolution in this diagnostic between our own epoch and one 4 Gyr earlier. However, the FOC measurement was particularly susceptible to systematic errors, and it was limited to a small number of galaxies in just one cluster. In contrast to the FOC results, recent Space Telescope Imaging Spectrograph {STIS} observations at z=0.55 obtained very weak detections of ellipticals at higher redshift, as expected for ellipticals much younger than those in our own epoch. Observations with the STIS far-UV camera are not subject to the uncertainties of the FOC measurements, because the STIS camera is blind to flux at longer wavelengths. Our observations of CL1358+62 will unambiguously test the apparent lack of evolution in the UV upturn over the past 4 Gyr.
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