Tracking the UV Upturn to z=0.55

Details Tracking the UV Upturn to z=0.55 Tracking the UV Upturn to z=0.55

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8020b&link_type=abstract

HST Proposal ID #8020

Statistics

Hst Proposal Id #8020 Clusters Of Galaxies

Scientific paper

We plan to observe the rich galaxy cluster Cl0016+16 {z=0.55} with the STIS FUVMAMA. The high concentration of elliptical galaxies in this cluster, when combined with its large distance, allows the observation of 10 ellipticals in the relatively small STIS field-of-view. The use of the F25QTZ filter reduces the background to incredibly low levels, and thus the observation is simply limited by UV-photon counting statistics. Furthermore, the lack of red leak in this bandpass will preclude the most important source of systematic errors in previous attempts at such measurments. The UV upturn is a sensitive indicator of age in a population, and our observation will provide an important benchmark in the mapping of this phenomenon at other redshifts and also for further measurements in this cluster. Four of the ellipticals are so bright that even non-detection places very strong constraints on the evolution of the UV upturn: non-detection would imply a UV upturn strength weaker t han 4.5 mag at this epoch, as measured by the 1550-V color. One bright Sd {z=0.65} also appears in the field; its presence should provide secondary science and serve as a bright UV fiducial among the much fainter ellipticals.

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