arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1704.05971astro-ph.GA
收藏

在HSC Wide巡天中围绕AGN的星系团

Clustering of galaxies around AGN 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

摘要:

我们测量了活动星系核(AGN)周围星系的成团情况,得到了超大质量黑洞(SMBH)的单历元维里质量,以研究活动星系核的大尺度环境与SMBH演化之间的关系。本文所用的AGN样品来自Sloan数字巡天(SDSS)观测,星系样品来自Subaru战略计划(HSC-SSP)的240 ° $^{2}$ S15 b数据。研究的红移范围为0.6- 3.0,质量范围为$10^{7.5}$ - $10^{10}$ ~M $_{\odot}$ .在静止帧波长为310 nm处,样品的绝对星等达到了$M_{λ310}$ $\sim$ $-$ 18。分析中超过70%的星系是蓝色的。我们发现互相关长度对红移有显著的依赖性,这主要反映了星系团的亮度依赖性。在最低红移时,互相关长度从$M_{λ310}$ $ = $ $-19$ ~mag附近的7~ $h^{-1}$ ~ Mpc增加到超过$M_{λ310}$ $ = $ $-20$ ~ mag的$>$ 10~ $h^{-1}$ ~Mpc。这些结果提供了一个图片的活动星系核的环境,在本文中研究的丰富的蓝色恒星形成的星系,和一小部分的星系正在演变成红色星系随着该系统中的SMBH的演变。

英文摘要:

We have measured the clustering of galaxies around active galactic nuclei (AGN) 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 240~deg$^{2}$ 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 $10^{7.5}$--$10^{10}$~M$_{\odot}$. The absolute magnitude of the galaxy samples reaches to $M_{λ310}$ $\sim$ $-$18 at rest frame wavelength 310~nm for the low-redshift end of the samples. More than 70\% of the galaxies in the analysis are blue. We found a significant dependence of the cross-correlation length on redshift, which primarily reflects the brightness dependence of the galaxy clustering. At the lowest redshifts the cross-correlation length increases from 7~$h^{-1}$~Mpc around $M_{λ310}$$ = $$-19$~mag to $>$10~$h^{-1}$~Mpc beyond $M_{λ310}$$ = $$-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 starforming galaxies, and a fraction of the galaxies are being evolved to red galaxies along with the evolution of SMBHs in that system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑