Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8193h&link_type=abstract
HST Proposal ID #8193
Mathematics
Logic
Hst Proposal Id #8193 Agn Hosts And Environment
Scientific paper
The underlying causes of the rapid cosmological evolution of the quasar population are a mystery around which are woven many different strands of contemporary cosmology. Progress on this problem would have important implications for understanding the early heating of the IGM, the formation and early evolution of galaxies, and of course the quasar phenomenon itself. We have begun a program with HST to image the host galaxies of a carefully-selected sample of five high- z {z 2 to 3} radio-quiet quasars in order to compare the photometric and structural properties of the host galaxies to those of the field population of normal star-forming galaxies at similar redshifts {the `Lyman break' galaxies}. We have already obtained deep H-band NICMOS {rest-frame visible} images of this sample, and find that the host galaxies are similar to the Lyman break galaxies in terms of their compact sizes and moderate luminosities. In the present proposal we request time to obtain WFPC2 images in order to extend this comparison into the crucial rest-UV spectral window, where the young stellar population can be most directly probed. This information is essential to begin to understand the long- hypothesized relationship between quasars and galaxy-building in the early universe. We emphasize that if the quasar host galaxies have UV sizes and luminosities similar to typical Lyman break galaxies, we will be able to detect them.
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