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arXiv 0905.2956astro-ph.CO
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校准[O IV ] 26 μ m作为固有AGN亮度的测量

Calibration of [O IV] 26 micron as a Measure of Intrinsic AGN Luminosity

J. R. Rigby, A. M. Diamond-Stanic, G. Aniano

摘要:

我们比较[O IV] 25.89微米的发射线光度非常硬(10-200千电子伏)的X射线雨燕,积分,和BeppoSAX的一个完整的样本89塞弗特从修订后的Shapley-艾姆斯样本。使用Seyfert 1 s,我们校准[O IV]作为活动星系核内禀光度的测量,特别是在高遮蔽环境中使用。有了这个校准,我们测量的平均递减14-195 keV的X射线[O IV]光度比塞弗特2s相比,类型1 s。我们发现塞弗特2s的衰减量为3.1 ± 0.8,已知康普顿厚度的塞弗特2s的衰减量为5.0 ± 2.7。这些递减意味着柱密度分别约为log N(H)=24.6和24.7 cm^-2。因此,我们推断,平均塞弗特2是更高度模糊和本质上更明亮的比将推断,甚至从非常硬的X射线。我们证明了两个应用程序的硬X射线[O IV]比。我们测量了非常模糊的NGC 1068的柱密度,log N(H)=25.3-25.4 cm^-2。最后,通过比较[O IV]光度的总红外光度的12个明亮的超亮红外星系,我们发现,四个有实质性的活动星系核的贡献。

英文摘要:

We compare [O IV] 25.89 micron emission line luminosities with very hard (10-200 keV) X-rays from Swift, Integral, and BeppoSAX for a complete sample of 89 Seyferts from the Revised Shapley-Ames sample. Using Seyfert 1s, we calibrate [O IV] as a measure of AGN intrinsic luminosity, for particular use in high-obscuration environments. With this calibration, we measure the average decrement in 14-195 keV X-ray to [O IV] luminosity ratio for Seyfert 2s compared to type 1s. We find a decrement of 3.1 +- 0.8 for Seyfert 2s, and a decrement of 5.0 +- 2.7 for known Compton-thick Seyfert 2s. These decrements imply column densities of approximately log N(H)=24.6 and 24.7 cm^-2, respectively. Thus, we infer that the average Seyfert 2 is more highly obscured and intrinsically more luminous than would be inferred even from the very hard X-rays. We demonstrate two applications of the hard X-ray to [O IV] ratio. We measure a column density for the extremely obscured NGC 1068 of log N(H)=25.3-25.4 cm^-2. Finally, by comparing [O IV] luminosities to total infrared luminosities for twelve bright ultraluminous infrared galaxies, we find that four have substantial AGN contributions.

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