A Morphological and Multicolor Survey for Ultrafaint QSOs/AGNs

Details A Morphological and Multicolor Survey for Ultrafaint QSOs/AGNs A Morphological and Multicolor Survey for Ultrafaint QSOs/AGNs

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7976a&link_type=abstract

HST Proposal ID #7976

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #7976 Extragalactic Astrophysics

Scientific paper

Measuring the populous faint end of the luminosity function is crucial for constraining the global evolution of QSOs/AGNs; and yet such objects are frustratingly dim, with m 24 at modest to high redshift. Although multicolor surveys have been undertaken for ultrafaint QSOs using groundbased CCD searches alone, due to seeing limitations such samples suffer strong morphological contamination by faint compact galaxies. Fortunately the HST archive includes a large and reasonably homogeneous collection of deep red WFPC2 images in high galactic latitude fields, and the 0.1'' spatial resolution of these images permits an exquisite opportunity for the morphological selection of a sample of ultrafaint objects with stellar PSFs {e.g., stars and QSOs}, as well as galaxies with stellar-PSF cores {e.g., Seyferts and low-z QSOs}. We have taken complementary deep groundbased UV/blue CCD images in 45 such archival red WFPC2 fields, including the ``Groth-Westphal Strip". We propose an archival analysis program that combines the multicolor photometric information {red WFPC2, and our UV/blue groundbased data}, with the extraordinary spatial resolution of the HST images, to obtain a morphological and multicolor survey for ultrafaint QSOs/AGNs to m 24. A quick look at a portion of these data confirms the viability of our approach, and yields a lower surface density of ultrafaint QSO candidates than found in groundbased surveys, although definitive results require more sophisticated reductions/analyses.

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