Clustering of Low-Redshift (z<=2.2) Quasars from the Sloan Digital Sky Survey

Details Clustering of Low-Redshift (z<=2.2) Quasars from the Sloan Digital Sky Survey Clustering of Low-Redshift (z<=2.2) Quasars from the Sloan Digital Sky Survey

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1082..186r&link_type=abstract

CLASSIFICATION AND DISCOVERY IN LARGE ASTRONOMICAL SURVEYS: Proceedings of the International Conference: ``Classification and Di

Computer Science

Databases

1

Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Quasars, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.

Scientific paper

We present measurements of the Quasar Two-Point Correlation Function, ζQ, over the redshift range 0.3<=z<=2.2 based upon a homogeneous sample of 38,208 quasars with spectroscopic redshifts from the Data Release 5 Quasar Catalogue. Over this redshift range, we find that the redshift-space correlation function, ζ(s), is well-fit by a single power-law, with s0 = 5.95+/-0.45 h-1 Mpc and γs = 1.16-0.16+0.11 when fit over 1.0<=s<=25.0 h-1 Mpc. Dividing the sample into redshift slices, we find no evidence for evolution of quasar clustering, with the correlation length staying roughly constant at s0~6-7 h-1 Mpc at z<~2.2. Comparing our clustering measurements to those reported for X-ray selected AGN at z~0.5-1, we find reasonable agreement in some cases but significantly lower correlation lengths in others. Assuming a standard ΛCDM cosmology, we find the linear bias evolves from b~1.4 at z = 0.5 to b~3 at z = 2.2, with b(z = 1.27) = 2.06+/-0.03 for the full sample. We compare our data to analytical models and infer that quasars inhabit dark matter haloes of constant mass Mhalo~1-2×1012 h-1 Msolar from redshifts z~2.5 (the peak of quasar activity) to z~0. The measured evolution of the clustering amplitude is in reasonable agreement with recent theoretical models, although measurements to fainter limits will be needed to distinguish different scenarios for quasar feeding and black hole growth.

Affiliated with

Also associated with

No associations

Rating

Clustering of Low-Redshift (z<=2.2) Quasars from the Sloan Digital Sky Survey 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 Clustering of Low-Redshift (z<=2.2) Quasars from the Sloan Digital Sky Survey, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clustering of Low-Redshift (z<=2.2) Quasars from the Sloan Digital Sky Survey will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1099897