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arXiv 1408.5889astro-ph.GA
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斯威夫特爆发警报望远镜活动星系核样本的赫歇尔远红外测光。I. PACS观察结果

Herschel Far-Infrared Photometry of the Swift Burst Alert Telescope Active Galactic Nuclei Sample of the Local Universe. I. PACS Observations

M. Meléndez, R. F. Mushotzky, T. T. Shimizu, A. J. Barger, L. L. Cowie

摘要:

利用赫歇尔空间天文台的光电探测器阵列照相机和分光仪(PACS)对来自58个月的雨燕爆发警报望远镜(BAT)活动星系表的313个邻近硬X射线选定星系进行远红外(FIR)测光。目前的数据不能区分西弗特1和西弗特2星系在70和160 μ m的远红外光度分布。这一结果表明,如果远红外辐射来自于吸积盘周围的核遮蔽物质,那么它的辐射是各向同性的,与方向无关。另外,70和160微米的大部分可能来自恒星形成,与活动星系核类型无关。用非参数检验的部分相关性与删失数据,我们发现一个统计上显着的相关性之间的活动星系核的内禀功率(在14-195 keV波段)和FIR发射在70和160 μ m的Seyfert 1星系。我们发现在塞弗特2星系的14-195 keV和FIR光度之间没有相关性。观测到的相关性表明两种可能的情况:(i)如果我们假设远红外线光度是恒星形成的一个很好的示踪剂,那么恒星形成和活动星系核之间在千秒差距尺度下存在联系,或者(ii)活动星系核加热的尘埃对远红外线辐射有统计上显著的贡献。使用斯皮尔曼秩序分析,14-195千电子伏的亮度为塞弗特1和2星系弱统计相关的F70/F160的比率。

英文摘要:

Far-Infrared (FIR) photometry from the the Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory is presented for 313 nearby, hard X-ray selected galaxies from the 58-month Swift Burst Alert Telescope (BAT) Active Galactic catalog. The present data do not distinguish between the FIR luminosity distributions at 70 and 160um for Seyfert 1 and Seyfert 2 galaxies. This result suggests that if the FIR emission is from the nuclear obscuring material surrounding the accretion disk, then it emits isotropically, independent of orientation. Alternatively, a significant fraction of the 70 and 160um could be from star formation, independent of AGN type. Using a non-parametric test for partial correlation with censored data, we find a statistically significant correlation between the AGN intrinsic power (in the 14-195 keV band ) and the FIR emission at 70 and 160um for Seyfert 1 galaxies. We find no correlation between the 14-195 keV and FIR luminosities in Seyfert 2 galaxies. The observed correlations suggest two possible scenarios: (i) if we assume that the FIR luminosity is a good tracer of star formation, then there is a connection between star formation and the AGN at sub-kiloparsec scales, or (ii) dust heated by the AGN has a statistically significant contribution to the FIR emission. Using a Spearman rank-order analysis, the 14-195 keV luminosities for the Seyfert 1 and 2 galaxies are weakly statistically correlated with the F70/F160 ratios.

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