The Sloan Digital Sky Survey View of the Palomar-Green Bright Quasar Survey
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Open Access
- 1 September 2005
- journal article
- research article
- Published by American Astronomical Society in The Astronomical Journal
- Vol. 130 (3) , 873-895
- https://doi.org/10.1086/432466
Abstract
We investigate the extent to which the Palomar-Green (PG) Bright Quasar Survey (BQS) is complete and representative of the general quasar population by comparing it with imaging and spectroscopy from the Sloan Digital Sky Survey (SDSS). A comparison of SDSS and PG photometry of both stars and quasars reveals the need to apply a color and magnitude recalibration to the PG data. Using the SDSS photometric catalog, we define the PG's parent sample of objects that are not main-sequence stars and simulate the selection of objects from this parent sample using the PG photometric criteria and errors. This simulation shows that the effective U - B cut in the PG survey is U - B < -0.71, implying a color-related incompleteness. As the color distribution of bright quasars peaks near U - B = -0.7 and the 2 σ error in U - B is comparable to the full width of the color distribution of quasars, the color incompleteness of the BQS is approximately 50% and essentially random with respect to U - B color for z < 0.5. There is, however, a bias against bright quasars at 0.5 < z < 1, which is induced by the color-redshift relation of quasars (although quasars at z > 0.5 are inherently rare in bright surveys in any case). We find no evidence for any other systematic incompleteness when comparing the distributions in color, redshift, and FIRST radio properties of the BQS and a BQS-like subsample of the SDSS quasar sample. However, the application of a bright magnitude limit biases the BQS toward the inclusion of objects that are blue in g - i, in particular compared to the full range of g - i colors found among the i-band limited SDSS quasars, and even at i-band magnitudes comparable to those of the BQS objects.Keywords
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This publication has 65 references indexed in Scilit:
- The Third Data Release of the Sloan Digital Sky SurveyThe Astronomical Journal, 2005
- The Second Data Release of the Sloan Digital Sky SurveyThe Astronomical Journal, 2004
- The 2dF QSO Redshift Survey - XII. The spectroscopic catalogue and luminosity functionMonthly Notices of the Royal Astronomical Society, 2004
- The First Data Release of the Sloan Digital Sky SurveyThe Astronomical Journal, 2003
- An Efficient Targeting Strategy for Multiobject Spectrograph Surveys: the Sloan Digital Sky Survey “Tiling” AlgorithmThe Astronomical Journal, 2003
- Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio‐loud and Radio‐quiet QSOsThe Astrophysical Journal, 2002
- The shape of the blue/UV continuum of B3-VLA radio quasars: dependence on redshift, blue/UV luminosity and radio powerMonthly Notices of the Royal Astronomical Society, 1999
- The NRAO VLA Sky SurveyThe Astronomical Journal, 1998
- The FIRST Survey: Faint Images of the Radio Sky at Twenty CentimetersThe Astrophysical Journal, 1995
- The emission-line properties of low-redshift quasi-stellar objectsThe Astrophysical Journal Supplement Series, 1992