Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7864h&link_type=abstract
HST Proposal ID #7864
Mathematics
Logic
Hst Proposal Id #7864 Agn And Quasars
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. The time is now ripe for a major attack on this problem with the HST. First, the addition of NICMOS allows us for the first time to make a rigorous differential comparison at the same rest wavelength between the host galaxies of high-z {z 2} and low-z quasars. We have also carefully selected a sample of high-z radio-quiet quasars that have the same absolute magnitudes as the low-z quasar sample imaged with HST by Bahcall and collaborators. We will therefore be comparing apples to apples. More generally, our deep NICMOS images will be able to detect host galaxies having sizes and {rest-frame} optical luminosities of typical present-day {L_*} galaxies. Second, the recent discovery of a field population of high-z star-forming galaxies gives us an important benchmark to which we can compare the properties of high-z quasar hosts. NICMOS images of our sample of quasars will allow us to detect host galaxies having the sizes and luminosities of these high-z field galaxies. Our team has a combination of experience in the use of HST to study quasar hosts and a deep involvement in the characterization of NICMOS.
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