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arXiv 1504.06284astro-ph.GAastro-ph.CO
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PRIMUS + DEEP2:z~0.7时X射线、射电和IR-AGN的聚类

PRIMUS + DEEP2: Clustering of X-ray, Radio and IR-AGN at z~0.7

Alexander J. Mendez, Alison L. Coil, James Aird, Ramin A. Skibba, Aleksandar M. Diamond-Stanic, John Moustakas, Michael R. Blanton, Richard J. Cool, Daniel J. E… 展开作者

Alexander J. Mendez, Alison L. Coil, James Aird, Ramin A. Skibba, Aleksandar M. Diamond-Stanic, John Moustakas, Michael R. Blanton, Richard J. Cool, Daniel J. Eisenstein, Kenneth C. Wong, Guangtun Zhu

摘要:

我们使用PRIMUS和DEEP 2红移巡天的多波长成像和光谱红移测量了X射线、射电和中红外选择的活动星系核(AGN)在0.2 < z < 1.2处的聚集,覆盖了7个独立的领域,跨度约10平方度。利用活动星系核与致密星系样本的互相关,我们测量了活动星系核在不同波长下的成团尺度长度和斜率,以及成团偏差。与以前的研究相似,我们发现X射线和射电活动星系核比中红外选择活动星系核更成簇。我们进一步比较了每个活动星系核样本的聚类与匹配的星系样本设计有相同的恒星质量,恒星形成率,和红移分布的活动星系核宿主星系,并发现它们的聚类特性之间没有显着差异。因此,在不同的波长选择的活动星系核的集群观察到的差异,可以解释为集群的差异,其主机的人口,有不同的分布在恒星质量和恒星形成率。因此,活动星系核选择中固有的选择偏差决定了观测到的活动星系核样本的聚集。我们进一步发现,使用IRAC或WISE颜色或X射线硬度比,模糊和未模糊的活动星系核之间的聚类没有显着差异。

英文摘要:

We measure the clustering of X-ray, radio, and mid-IR-selected active galactic nuclei (AGN) at 0.2 < z < 1.2 using multi-wavelength imaging and spectroscopic redshifts from the PRIMUS and DEEP2 redshift surveys, covering 7 separate fields spanning ~10 square degrees. Using the cross-correlation of AGN with dense galaxy samples, we measure the clustering scale length and slope, as well as the bias, of AGN selected at different wavelengths. Similar to previous studies, we find that X-ray and radio AGN are more clustered than mid-IR-selected AGN. We further compare the clustering of each AGN sample with matched galaxy samples designed to have the same stellar mass, star formation rate, and redshift distributions as the AGN host galaxies and find no significant differences between their clustering properties. The observed differences in the clustering of AGN selected at different wavelengths can therefore be explained by the clustering differences of their host populations, which have different distributions in both stellar mass and star formation rate. Selection biases inherent in AGN selection, therefore, determine the clustering of observed AGN samples. We further find no significant difference between the clustering of obscured and unobscured AGN, using IRAC or WISE colors or X-ray hardness ratio.

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