The 2dF-SDSS LRG and QSO (2SLAQ) survey: the z < 2.1 quasar luminosity function from 5645 quasars to g=21.85

Richards, G. T., Croom, S. M., Anderson, S. F., Bland-Hawthorn, J., Boyle, B. J., De Propris, R., Drinkwater, M. J., Fan, X. H., Gunn, J. E., Ivezic, Z., Jester, S., Loveday, J., Meiksin, A., Miller, L., Myers, A., Nichol, R. C., Outram, P. J., Pimbblet, K. A., Roseboom, I. G., Ross, N., Schneider, D. P., Shanks, T., Sharp, R. G., Stoughton, C., Strauss, M. A., Szalay, A. S., Vanden Berk, D. E. and York, D. G. (2005) The 2dF-SDSS LRG and QSO (2SLAQ) survey: the z < 2.1 quasar luminosity function from 5645 quasars to g=21.85. Royal Astronomical Society. Monthly Notices, 360 3: 839-852. doi:10.1111/j.1365-2966.2005.09096.x

Author Richards, G. T.
Croom, S. M.
Anderson, S. F.
Bland-Hawthorn, J.
Boyle, B. J.
De Propris, R.
Drinkwater, M. J.
Fan, X. H.
Gunn, J. E.
Ivezic, Z.
Jester, S.
Loveday, J.
Meiksin, A.
Miller, L.
Myers, A.
Nichol, R. C.
Outram, P. J.
Pimbblet, K. A.
Roseboom, I. G.
Ross, N.
Schneider, D. P.
Shanks, T.
Sharp, R. G.
Stoughton, C.
Strauss, M. A.
Szalay, A. S.
Vanden Berk, D. E.
York, D. G.
Title The 2dF-SDSS LRG and QSO (2SLAQ) survey: the z < 2.1 quasar luminosity function from 5645 quasars to g=21.85
Journal name Royal Astronomical Society. Monthly Notices   Check publisher's open access policy
ISSN 0035-8711
Publication date 2005
Sub-type Article (original research)
DOI 10.1111/j.1365-2966.2005.09096.x
Open Access Status DOI
Volume 360
Issue 3
Start page 839
End page 852
Total pages 14
Editor A. C. Fabian
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2005
Language eng
Abstract We have used the Two-Degree Field (2dF) instrument on the Anglo-Australian Telescope (AAT) to obtain redshifts of a sample of z < 3 and 18.0 < g < 21.85 quasars selected from Sloan Digital Sky Survey (SDSS) imaging. These data are part of a larger joint programme between the SDSS and 2dF communities to obtain spectra of faint quasars and luminous red galaxies, namely the 2dF-SDSS LRG and QSO (2SLAQ) Survey. We describe the quasar selection algorithm and present the resulting number counts and luminosity function of 5645 quasars in 105.7 deg(2). The bright-end number counts and luminosity functions agree well with determinations from the 2dF QSO Redshift Survey (2QZ) data to g similar to 20.2. However, at the faint end, the 2SLAQ number counts and luminosity functions are steeper (i.e. require more faint quasars) than the final 2QZ results from Croom et al., but are consistent with the preliminary 2QZ results from Boyle et al. Using the functional form adopted for the 2QZ analysis ( a double power law with pure luminosity evolution characterized by a second-order polynomial in redshift), we find a faint-end slope of beta =-1.78 +/- 0.03 if we allow all of the parameters to vary, and beta =-1.45 +/- 0.03 if we allow only the faint-end slope and normalization to vary (holding all other parameters equal to the final 2QZ values). Over the magnitude range covered by the 2SLAQ survey, our maximum-likelihood fit to the data yields 32 per cent more quasars than the final 2QZ parametrization, but is not inconsistent with other g > 21 deep surveys for quasars. The 2SLAQ data exhibit no well-defined 'break' in the number counts or luminosity function, but do clearly flatten with increasing magnitude. Finally, we find that the shape of the quasar luminosity function derived from 2SLAQ is in good agreement with that derived from Type I quasars found in hard X-ray surveys.
Keyword Astronomy & Astrophysics
Galaxies : Active
Quasars : General
Galaxies : Seyfert
Cosmology : Observations
High-redshift Quasars
Survey Photometric System
Optically Selected Qsos
Active Galactic Nuclei
Early Data Release
1st Data Release
Stellar Objects
Spectroscopic Survey
Q-Index Code C1

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