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QUASAR-GALAXY CLUSTERING THROUGH PROJECTED GALAXY COUNTS AT z=0.6-1.2

【标题】QUASAR-GALAXY CLUSTERING THROUGH PROJECTED GALAXY COUNTS AT z=0.6-1.2

【Title】QUASAR-GALAXY CLUSTERING THROUGH PROJECTED GALAXY COUNTS AT z=0.6-1.2

【DOI】10.1088/0004-637X/773/2/175

【作者】 张少华; 周宏岩

【Author】 Zhang Shaohua ; Zhou Hongyan

【期刊】The Astrophysical Journal

【Journal】The Astrophysical Journal

【期刊年份】2013

【卷】 773

【期】2

【关键词】 galaxies: clusters: general; large-scale structure of universe; quasars: general

【Keywords】 galaxies: clusters: general; large-scale structure of universe; quasars: general

【摘要】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(rp ) on scales of 0.05 < rp < 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.

【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(rp ) on scales of 0.05 < rp < 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.

【基金/项目】

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