QUASAR-GALAXY CLUSTERING THROUGH PROJECTED GALAXY COUNTS ATz= 0.6-1.2

2013/07/08 by Shao-Hua Zhang, Shaohua Zhang, Ting-Gui Wang +4
Physics and Astronomy · #Amplitude #Astronomy and Astrophysical Research #Cluster analysis #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Luminosity #Quasar #Redshift #Sky #Statistical Mechanics and Entropy #astro-ph.CO

paper · pdf · doi:10.1088/0004-637x/773/2/175

16 pages, 8 figures, accepted for publication in the ApJ

arxiv created 2013/07/08 · openalex publication_date 2013/08/06 · arxiv updated 2014/12/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We investigate the spatial clustering of galaxies around quasars at z = 0.6–1.2 using photometric data from Sloan Digital Sky Survey Stripe 82. The quasar and galaxy cross-correlation functions are measured through the projected galaxy number density n ( r p ) on scales of 0.05 < r p < 20 h −1 Mpc around quasars for a sample of 2300 quasars from Schneider et al. We detect strong clustering signals at all redshifts and find that the clustering amplitude increases significantly with redshift. We examine the dependence of quasar–galaxy clustering on quasar and galaxy properties and find that the clustering amplitude is significantly larger for quasars with more massive black holes or with bluer colors, while there is no dependence on quasar luminosity. We also show that quasars have a stronger correlation amplitude with blue galaxies than with red galaxies. We finally discuss the implications of our findings.

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