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arXiv 1205.0140astro-ph.HE
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根据Swift/BAT和AKARI全天巡天对AGN识别的红外和硬X射线诊断

Infrared and hard X-ray diagnostics of AGN identification from the Swift/BAT and AKARI all-sky surveys

Keiko Matsuta, Poshak Gandhi, Tadayasu Dotani, Takao Nakagawa, Naoki Isobe, Yoshihiro Ueda, Kohei Ichikawa, Yuichi Terashima, Shinki Oyabu, Issei Yamamura, Łukasz Stawarz

摘要:

结合两次全天巡天观测的数据,研究了活动星系核(AGN)的红外和硬X射线(> 10 keV)性质之间的联系。雨燕/爆发警报望远镜全天巡天提供了一个公正的,通量有限的硬X射线检测活动星系核的选择。利用22个月的硬X射线巡天资料与AKARI全天巡天资料进行交叉对比,研究了AKARI仪器探测到的158个活动星系核。我们发现,大多数活动星系核之间的红外(9,18,和90微米)和硬X射线(14-195千电子伏)的光度有很强的相关性,并量化的活动星系核的各个子样本的相关性。偏相关分析证实了去除红移贡献后的内禀相关。射电星系的相关性具有与Seyfert 1 s相同的斜率和归一化,这意味着两者具有相似的硬X射线/红外发射过程。相比之下,康普顿厚源在硬X射线波段表现出很大的缺陷,因为高的气柱密度甚至降低了它们的硬X射线亮度。我们提出了两个光度诊断源分类:一个是X射线亮度与红外颜色图,其中1型射电响亮AGN是很好地隔离从其他样品。另一种是利用X射线与红外线的颜色作为识别康普顿厚度活动星系核的有用的红移无关的指示剂。重要的是,复合系统中的康普顿厚度的活动星系核和星暴星系也可以根据它们的硬X射线通量和尘埃温度在这个平面上进行区分。这个图可能是有用的,作为一个新的指标,以分类对象在新的和即将到来的调查,如WISE和NuSTAR。

英文摘要:

We combine data from two all-sky surveys in order to study the connection between the infrared and hard X-ray (>10keV) properties for local active galactic nuclei (AGN). The Swift/Burst Alert Telescope all-sky survey provides an unbiased, flux-limited selection of hard X-ray detected AGN. Cross-correlating the 22-month hard X-ray survey with the AKARI all-sky survey, we studied 158 AGN detected by the AKARI instruments. We find a strong correlation for most AGN between the infrared (9, 18, and 90 micron) and hard X-ray (14-195 keV) luminosities, and quantify the correlation for various subsamples of AGN. Partial correlation analysis confirms the intrinsic correlation after removing the redshift contribution. The correlation for radio galaxies has a slope and normalization identical to that for Seyfert 1s, implying similar hard X-ray/infrared emission processes in both. In contrast, Compton-thick sources show a large deficit in the hard X-ray band, because high gas column densities diminish even their hard X-ray luminosities. We propose two photometric diagnostics for source classification: one is an X-ray luminosity vs. infrared color diagram, in which type 1 radio-loud AGN are well isolated from the others in the sample. The other uses the X-ray vs. infrared color as a useful redshift-independent indicator for identifying Compton-thick AGN. Importantly, Compton-thick AGN and starburst galaxies in composite systems can also be differentiated in this plane based upon their hard X-ray fluxes and dust temperatures. This diagram may be useful as a new indicator to classify objects in new and upcoming surveys such as WISE and NuSTAR.

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。

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