Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6667f&link_type=abstract
HST Proposal ID #6667
Physics
Hst Proposal Id #6667 Cosmology
Scientific paper
The far-UV spectra of nearby giant elliptical galaxies are characterized by a ``UV rising branch," which varies greatly in strength from galaxy to galaxy. Studies with IUE, HUT, and HST suggest that the UV flux arises from the advanced phases of evolution in low-mass stars in these systems. While there are several different models to explain the presence such stars in elliptical galaxies, a common feature of the models is that the number of hot stars is a sensitive function of the main-sequence turnoff mass. Because of this, the models in general predict rapid evolution of the far-UV upturn with lookback time. We propose to observe a sample of galaxies in the cluster Abell 370 {z=0.37} with the FOC using the F130LP and F370LP filters. The difference between the two images will effectively provide the flux that would be measured through a broad, very high throughput far-UV filter. Tests on simulated data indicate that these observations will provide a sensitive measure of the strength of the UV rising branch, and decisive upper limits if the galaxies are not detected.
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