Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9218s&link_type=abstract
HST Proposal ID #9218
Computer Science
Hst Proposal Id #9218 Agn/Quasars
Scientific paper
We request funding to study two epochs of 20 WFPC2 images of the Groth Survey Strip {GSS}. Our primary scientific goal is to detect variable low-luminosity AGN which often reside in much brighter host galaxies. The high resolution capabilities of HST are critical to isolate and measure variability of nuclei too faint to be detected from the ground. Using 3-pixel aperture photometry, we expect to detect variability for nuclei comprising as little as 5 V_606=22.5 and 15 This technique has already proven successful on HDF-N images separated by 2 years. Our proposal is being submitted in conjunction with a GO proposal to reobserve all 28 fields of the GSS resulting in complete 2 epoch coverage for the entire survey region and 3 epochs of data for 20 of these fields. We expect to find between 30 to 85 Seyfert-like AGN in this region of the GSS as well as 7 regular QSOs. This sample of intrinisically faint AGN will, for the first time, yield the faint end of the AGN luminosity function at moderate redshifts. Of equal importance is the study of the morphology, nature, and evolution of AGN host galaxies. We already have 600 GSS galaxy spectra from the Keck telescope and plan to use future observing time to specifically target the variable objects selected in this study to obtain redshifts and spectroscopic confirmations for the brighter AGNs.
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