Investigating the Nuclear Obscuration in Two Types of Seyfert 2 Galaxies

Investigating the Nuclear Obscuration in Two Types of Seyfert 2 Galaxies
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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.
Jiang, P.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Fan, L. L.;Wang, J. X.;Shu, X. W.;Wang, T. G.;Jiang, P.

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我们利用光谱偏振和X射线数据构建了一个大样本的赛弗特2星系(Sy 2s),其中29个Sy 2s有偏振宽发射线(PBL)探测,25个Sy 2s没有。我们发现,对于L_[OIII]>10^41 erg/s的Sy 2发光体,有PBL的源比无PBL的源具有更小的X射线吸收柱密度(92.3%置信水平):大多数N_H<10^23.8 cm^-2的Sy 2都显示出PBL(86%,12/14),而具有较重遮蔽的源的分数要小得多(54%,15/28)。以“T“比(F_2- 10 keV/F_[O III])为指标,吸收差的置信度高达99.1%。我们排除观察或选择偏差作为差异的起源。我们的研究结果,第一次与高统计置信度,表明,在除了核活动,核遮蔽也发挥了重要作用,在Sy 2s的PBL的可见性。这些结果可以在统一模型的框架下得到解释。在统一模型中,如果:a)吸收柱密度在大倾角处较高,以及B)散射区在大倾角处被遮蔽,则可以得到这些结果。
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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发表时间: 2000-04
影响因子: 4.8
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影响因子: --
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影响因子: 4.8
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