Clustering of galaxies around AGNs in the HSC Wide survey

PASJ: Publications of the Astronomical Society of Japan

He, Wanqiu¹  Nagao, Tohru²  Ohishi, Masatoshi²  Usuda, Tomonori³  Miyazaki, Satoshi³  Akiyama, Masayuki³  Shirasaki, Yuji⁴  Nishizawa, Atsushi J⁴  Mizumoto, Yoshihiko⁴  Toba, Yoshiki⁵ 

[1] Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 10617, Taiwan;Astronomical Institute, Tohoku University, 6-3 Aramaki, Aoba-ku Sendai, Miyagi 980-8578, Japan;Department of Astronomical Science, School of Physical Sciences, SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Research Center for Space and Cosmic Evolution, Ehime University, 10-13 Dogo-Himata, Matsuyama, Ehime 790-8577, Japan

关键词: galaxies: active;    (galaxies:) quasars: general;    (cosmology:) large-scale structure of universe;   

DOI  :  10.1093/pasj/psx099

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We have measured the clustering of galaxies around active galactic nuclei (AGNs) for which single-epoch virial masses 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 310 nm for 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 = −19 mag 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 cross-correlation 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.

【 授权许可】

CC BY