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arXiv 0811.3255astro-ph
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硬X射线(<60 keV)选择Seyfert 1镓样品的吸积特性

Accretion Properties of A Sample of Hard X-ray (<60keV) Selected Seyfert 1 Galaxies

J. Wang, Y. F. Mao, J. Y. Wei

摘要:

我们研究了42个硬(3- 60 keV)X射线选近宽线活动星系核的吸积性质。样品中的能量范围比以前类似研究中通常使用的更硬。这些活动星系核主要是由RXTE全天巡天(XSS)编制的,并由已发布的INTEGRAL活动星系核目录补充。根据H $β$宽发射线的光谱,导出了活动星系核的黑洞质量、辐射热光度和爱丁顿比。在我们的样品中,硬X射线(3- 20 keV)和测辐射热光度/线光度之间的紧密相关性被很好地确定。还确定了一个强的反鲍德温关系的H $β$发射线。此外,所有这些硬X射线活动星系核偏向于具有高爱丁顿比(大多在0.01到0.1之间)和低柱密度($<10^{22} \mathrm{cm^{-2}}$)的发光天体,这很可能是由于巡天的选择效应。因此,硬X射线光度与黑洞质量密切相关。我们相信,在未来几年内,通过正在进行的Swift和INTEGRAL任务,以及接下来的高级任务,如NuSTAR,Simbol-X和NeXT,样本的完整性将得到改善。最后,RFe(=光学Fe II/H $β$)和磁盘温度之间的相关性评估由$T\propto (L/L_{\mathrm{Edd}})M_{\mathrm{BH}}^{-1}$导致我们建议,Fe II发射的强度主要是由电离光谱的形状。

英文摘要:

We examine the accretion properties in a sample of 42 hard (3-60keV) X-ray selected nearby broad-line AGNs. The energy range in the sample is harder than that usually used in the similar previous studies. These AGNs are mainly complied from the RXTE All Sky Survey (XSS), and complemented by the released INTEGRAL AGN catalog. The black hole masses, bolometric luminosities of AGN, and Eddington ratios are derived from their optical spectra in terms of the broad H$β$ emission line. The tight correlation between the hard X-ray (3-20keV) and bolometric/line luminosity is well identified in our sample. Also identified is a strong inverse Baldwin relationship of the H$β$ emission line. In addition, all these hard X-ray AGNs are biased toward luminous objects with high Eddington ratio (mostly between 0.01 to 0.1) and low column density ($<10^{22} \mathrm{cm^{-2}}$), which is most likely due to the selection effect of the surveys. The hard X-ray luminosity is consequently found to be strongly correlated with the black hole mass. We believe the sample completeness will be improved in the next few years by the ongoing Swift and INTEGRAL missions, and by the next advanced missions, such as NuSTAR, Simbol-X, and NeXT. Finally, the correlation between RFe (=optical FeII/H$β$) and disk temperature as assessed by $T\propto (L/L_{\mathrm{Edd}})M_{\mathrm{BH}}^{-1}$ leads us to suggest that the strength of the FeII emission is mainly determined by the shape of the ionizing spectrum.

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