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arXiv 1503.02561astro-ph.GA
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WISE/射电选择AGN及其环境的亚毫米观测

Submillimetre observations of WISE/radio-selected AGN and their environments

Suzy F. Jones, Andrew W. Blain, Carol Lonsdale, James Condon, Duncan Farrah, Daniel Stern, Chao-Wei Tsai, Roberto J. Assef, Carrie Bridge, Amy Kimball, Mark Lac… 展开作者

Suzy F. Jones, Andrew W. Blain, Carol Lonsdale, James Condon, Duncan Farrah, Daniel Stern, Chao-Wei Tsai, Roberto J. Assef, Carrie Bridge, Amy Kimball, Mark Lacy, Peter Eisenhardt, Jingwen Wu, Tom Jarrett

摘要:

本文介绍了由WISE全天空红外巡天和NVSS/FIRST射电巡天联合探测到的30个中红外活动星系核的JCMT SCUBA-2 850微米亚毫米观测结果。这些罕见的来源是通过其极红的中红外光谱能量分布(SED)和紧凑的无线电对应物来选择的。进一步的研究表明,它们是高度模糊的,有大量温暖的活动星系核加热的尘埃,并被认为正在经历强烈的活动星系核反馈。这些星系似乎与活动星系核主导的星系一致,可能是星系合并的短暂阶段。当比较在周围1.5弧分偶然发现的亚毫米星系(SMG)的数量与空白场亚毫米调查中的亚毫米星系时,有一个非常显著的5阶过密度,但没有以我们的主要物体为中心的径向聚集的迹象。因此,WISE/无线电选择的AGN位于10 Mpc尺度的过密环境中,可能形成于病毒化前的星系团中。WISE/射电选择活动星系核似乎是活跃、明亮和尘埃星系高密度区域的最强路标。SCUBA-2的850微米观测结果表明,与许多流行的活动星系核SED模板相比,它们的亚毫米级通量很低,因此WISE/射电选择活动星系核的冷尘埃排放量比通常认为的典型活动星系核少,而暖尘埃排放量比通常认为的典型活动星系核多。大多数目标都没有被探测到,只有四个目标在SCUBA-2 850微米处被探测到,并且总的红外光度>= 10^13 L_solar,如果它们的红移与10个已知红移的SCUBA-2未探测目标的子集一致,z ~ 0.44 - 2.86。

英文摘要:

We present JCMT SCUBA-2 850microns submillimetre (submm) observations of 30 mid-infrared (mid-IR) luminous AGN, detected jointly by the WISE all-sky IR survey and the NVSS/FIRST radio survey. These rare sources are selected by their extremely red mid-infrared spectral energy distributions (SEDs) and compact radio counterparts. Further investigations show that they are highly obscured, have abundant warm AGN-heated dust and are thought to be experiencing intense AGN feedback. These galaxies appear to be consistent with an AGN-dominated galaxy, and could be a transient phase of merging galaxies. When comparing the number of submm galaxies (SMGs) detected serendipitously in the surrounding 1.5-arcmin to those in blank-field submm surveys, there is a very significant overdensity, of order 5, but no sign of radial clustering centred at our primary objects. The WISE/radio-selected AGN thus reside in 10-Mpc-scale overdense environments, that could be forming in pre-viralised clusters of galaxies. WISE/radio-selected AGNs appear to be the strongest signposts of high-density regions of active, luminous and dusty galaxies. SCUBA-2 850microns observations indicate that their submm fluxes are low compared to many popular AGN SED templates, hence the WISE/radio-selected AGNs have either less cold and/or more warm dust emission than normally assumed for typical AGN. Most of the targets are not detected, only four targets are detected at SCUBA-2 850microns, and have total IR luminosities >= 10^13 L_solar, if their redshifts are consistent with the subset of the 10 SCUBA-2 undetected targets with known redshifts, z ~ 0.44 - 2.86.

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