A Morphological and Multicolor HST Survey for Ultrafaint Quasars, Sampling A Broad Redshift Range

Details A Morphological and Multicolor HST Survey for Ultrafaint Quasars, Sampling A Broad Redshift Range A Morphological and Multicolor HST Survey for Ultrafaint Quasars, Sampling A Broad Redshift Range

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8743a&link_type=abstract

HST Proposal ID #8743

Mathematics

Logic

Hst Proposal Id #8743 Agn/Quasars

Scientific paper

Quasars representative of the populous faint end of the luminosity function are frustratingly dim with m>24 at modest to high redshift; moreover groundbased surveys for such faint QSOs suffer severe morphological contamination by compact galaxies. In an initial survey begun several years ago, we demonstrated the power of combining multicolor photometry with the 0.1'' spatial resolution of HST to yield a morphological and multicolor survey for quasars to B <=sssim 24. Although limited to z<=sssim 2.1 and based on only 10 QSO candidates, our initial HST counts both confirmed the severe {>85 surveys, while simultaneously showing remarkable agreement {albeit with large errors} with predictions of popular model luminosity functions. These tantalizing initial results presage the full potential of an HST-based survey possible now; in the interim many additional WFPC2 fields, observed with more optimal filter sets, have become available in the archive. Our proposed program will: {1} increase by 3-8* the sample-size of reliable ultrafaint quasar candidates; {2} broaden the redshift sensitivity to encompass even the highest-z QSOs; {3} increase the depth surveyed consistently by 3 magnitudes, extending the logN-logS curve from B 24.5 to B 27.5. This new HST quasar survey will yield strong constraints on model luminosity functions, even pending confirming spectroscopy.

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