arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.05888astro-ph.GA
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通过HSC广测研究AGN和亮星系对周围环境的性质

Properties of environment around AGN and luminous galaxy pairs through HSC wide survey

Yuji Shirasaki, Masayuki Akiyama, Yoshiki Toba, Wanqiu He, Tomotsugu Goto

摘要:

我们研究了活动星系核环境的性质,特别是在距活动星系核4~Mpc范围内发现了红移为0.8 - 1.1的亮星系协的环境。作为比较,我们研究了另外三种活动星系核环境(即各种类型的活动星系核、具有X射线和/或射电探测的1型活动星系核和2型活动星系核)和一种蓝$M_{*}$(Schechter函数的特征光度)星系环境。测量并比较了AGN和蓝星系样本与周围星系的交叉关联函数。我们还比较了这些目标天体周围星系的颜色、绝对星等和恒星质量的分布。利用基于光度红移选择的周围星系探测到的星系团的性质进行了研究,并对不同的样品进行了比较。目标活动星系核取自百万类星体(MILLENSAS)星表,蓝星系取自六个红移巡天星表(SDSS、WiggleZ、DEEP 2、VVDS、VIPERS和PRIMUS)。用于测量目标周围环境的星系是从超级Suprime-Cam斯巴鲁战略计划(HSC-SSP)发布的S18 a内部数据中绘制的。我们发现,在所考虑的五个AGN和蓝星系样本中,AGN-LG对的环境是最丰富的发光星系。我们还发现,在AGN-LG对样本中的质量选择集群的数量比其他样本中的数量有所增加。研究结果表明,活动星系核和类地星系团的成协是由多个星系团的存在所决定的,而不是由单个大质量暗物质晕所决定的。

英文摘要:

We investigated the properties of AGN environments, particularly environments where the association of luminous galaxies (LGs) is found within 4~Mpc from AGNs with redshifts of 0.8 -- 1.1. For comparison, three additional AGN environments, (namely, AGNs of all types, type~1 AGNs with X-ray and/or radio detection, and type~2 AGNs) and an environment of blue $M_{*}$, characteristic luminosity of the Schechter function, galaxies were investigated. The cross-correlation function with the surrounding galaxies was measured and compared between the AGN and blue galaxy samples. We also compared the distributions of color, absolute magnitude, and stellar mass of the galaxies around such target objects. The properties of clusters detected using surrounding galaxies selected based on a photometric redshift were examined and compared for different samples. The target AGNs were drawn from the Million Quasars (MILLIQUAS) catalog, and the blue galaxies were drawn from six redshift survey catalogs (SDSS, WiggleZ, DEEP2, VVDS, VIPERS, and PRIMUS). The galaxies used as a measure of the environment around the targets are drawn from S18a internal data released by the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). We found that, among the five AGN and blue galaxy samples considered, the environment of AGN-LG pairs is the most enriched with luminous galaxies. We also found an enhancement in the number of mass-selected clusters in the AGN-LG pair sample against those in the other samples. The results obtained in this study indicate that existence of multiple clusters is the major driver in the association of AGNs and LGs, rather than a single large-mass dark matter halo hosting the AGN.

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