Limits on the z>4 Quasar Luminosity Function at Faint Magnitudes

Details Limits on the z>4 Quasar Luminosity Function at Faint Magnitudes Limits on the z>4 Quasar Luminosity Function at Faint Magnitudes

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.1903s&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #19.03; Bulletin of the American Astronomical Society, Vol. 26, p.1341

Astronomy and Astrophysics

Astronomy

Scientific paper

We have been conducting a search for protoclusters around known z>4 quasars using a multicolor imaging technique (Djorgovski et al. 1991, ASPCS, 21, 325; Smith et al. 1993, ASPCS, 43, 189). We have obtained imaging data on 23, z>4 quasar fields using the Palomar 200-inch telescope, the CTIO 4-m telescope, and the ESO NTT. These data are typically complete to r=24(m) . Assuming H_0 = 75km/sec/Mpc and q_0 = 0.1, this is equivalent to M_B = -23(m) , and thus we are probing the AGN luminosity function to the Seyfert 1 level. In a search for high redshift quasars at r < 21.5, Schmidt et al. (1991, ASPCS, 21, 109) see evidence for a turnover in the z>4 quasar luminosity function at faint magnitudes, while Irwin et al. (1991, ASPCS, 21, 117) see no such decline at R < 19. Our survey has covered 0.75 deg(2) which, for an effective redshift range of 4.1 < z < 4.9, corresponds to 6*E(6) comoving Mpc(3) for the cosmology stated above. We typically find 1 -- 2 candidates per field selected by their colors and image morphology. Most of these objects have turned out to be galaxies at z<1, but we still have a few candidates with emission suggestive of them being objects at z>4. However, we have found no significant population of objects around these known quasars, suggesting that the decline seen by Schmidt et al. is real, and that it continues some 2 magnitudes deeper than the limits of their survey. We will present detailed completeness estimates and quantitative constraints on the z > 4 quasar luminosity function.

Affiliated with

Also associated with

No associations

Rating

Limits on the z>4 Quasar Luminosity Function at Faint Magnitudes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Limits on the z>4 Quasar Luminosity Function at Faint Magnitudes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Limits on the z>4 Quasar Luminosity Function at Faint Magnitudes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1318905