Investigating the Nuclear Obscuration in Two Types of Seyfert 2 Galaxies
Investigating the Nuclear Obscuration in Two Types of Seyfert 2 Galaxies
复制标题
研究两种类型 Seyfert 2 星系中的核遮蔽
DOI:
10.1086/510579
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发表时间:
2006-03
影响因子:
4.9
通讯作者:
Jiang, P.
中科院分区:
文献类型:
--
作者:
Fan, L. L.;Wang, J. X.;Shu, X. W.;Wang, T. G.;Jiang, P.
We build a large sample of Seyfert 2 galaxies (Sy2s) with both optical spectropolarimetric and X-ray data available, in which 29 Sy2s with the detection of polarized broad emission line (PBL) and 25 without. We find that for luminous Sy2s with L_[OIII]>10^41 erg/s, sources with PBL have smaller X-ray absorption column density comparing with those without PBL (at 92.3% confidence level): most of the Sy2s with N_H<10^23.8 cm^-2 show PBL (86%, 12 out 14), while the fraction is much smaller for sources with heavier obscuration (54%, 15 out 28). The confidence level of the difference in absorption bounces up to 99.1% while using the"T"ratio (F_2-10keV/F_[O III]) as an indicator. We rule out observation or selection bias as the origin for the difference. Our results, for the first time with high statistical confidence, show that, in additional to the nuclei activity, the nuclear obscuration also plays an important role in the visibility of PBL in Sy2s. These results can be interpreted in the framework of the unified model. We can reach these results in the unified model if: a) the absorption column density is higher at large inclinations and b) the scattering region is obscured at large inclinations.
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DOI:
10.1046/j.1365-8711.2000.03285.x
发表时间:
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影响因子:
4.8
作者:
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期刊:
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DOI:
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影响因子:
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