Clustering of galaxies around AGNs in the HSC Wide survey

Yuji Shirasaki, Masayuki Akiyama, Tohru Nagao, Yoshiki Toba, Wanqiu He, Masatoshi Ohishi, Yoshihiko Mizumoto, Satoshi Miyazaki, Atsushi J. Nishizawa, Tomonori Usuda

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5 Citations (Scopus)


We have measured the clustering of galaxies around active galactic nuclei (AGNs) for which single-epoch virialmasses of the super-massive black hole (SMBH) are available to investigate the relation between the large-scale environment of AGNs and the evolution of SMBHs. The AGN samples used in this work were derived from the Sloan Digital Sky Survey (SDSS) observations and the galaxy samples were from the 240 deg2 S15b data of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). The investigated redshift range is 0.6-3.0, and the masses of the SMBHs lie in the range 107.5-1010 M. The absolute magnitude of the galaxy samples reaches to Mλ310 ∼ -18 at rest-frame wavelength 310nmfor the low-redshift end of the samples. More than 70% of the galaxies in the analysis are blue.We found a significant dependence of the cross-correlation length on redshift, which primarily reflects the brightness-dependence of the galaxy clustering. At the lowest redshifts the cross-correlation length increases from 7 h-1 Mpc around Mλ310 =-19mag to >10 h-1 Mpc beyond Mλ310 =-20 mag. No significant dependence of the cross-correlation length on BH mass was found for whole galaxy samples dominated by blue galaxies, while there was an indication of BH mass dependence in the crosscorrelation with red galaxies. These results provides a picture of the environment of AGNs studied in this paper being enriched with blue star-forming galaxies, and a fraction of the galaxies are evolving into red galaxies along with the evolution of SMBHs in that system.

Original languageEnglish
Article numberS30
JournalPublications of the Astronomical Society of Japan
Issue numberSpecial Issue 1
Publication statusPublished - 2018 Jan 1


  • Active-large-scale structure of universe-quasars
  • Galaxies
  • General

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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