X-ray spectral properties of the AGN sample in the northern XMM-XXL field
文献类型：期刊论文
| 作者 | Liu, Zhu1,2,3 ; Merloni, Andrea3; Georgakakis, Antonis3,4; Menzel, Marie-Luise3; Buchner, Johannes3; Nandra, Kirpal3; Salvato, Mara3; Shen, Yue5,6; Brusa, Marcella3,7,8; Streblyanska, Alina9,10
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2016-06-21 |
| 卷号 | 459期号:2页码:1602-1625 |
| 关键词 | galaxies: active X-rays: galaxies |
| 英文摘要 | In this paper we describe and publicly release a catalogue consisting of 8445 point-like X-ray sources detected in the XMM-XXL north survey. For the 2512 AGN which have reliable spectroscopy from SDSS-III/BOSS, we present the X-ray spectral fitting which has been computed with a Bayesian approach. We have also applied an X-ray spectral stacking method to different sub-samples, selected on the basis of the AGN physical properties (L2-10 keV, z, M-BH, lambda(Edd) and N-H). We confirm the well-known Iwasawa-Taniguchi effect in our luminosity-redshift sub-samples, and argue that such an effect is due to a decrease in the covering factor of a distant obscuring 'torus' with increasing X-ray luminosity. By comparing the distribution of the reflection fraction, the ratio of the normalization of the reflected component to the direct radiation, we find that the low-luminosity, low-redshift sub-sample had systematically higher reflection fraction values than the high-redshift, high-luminosity one. On the other hand, no significant difference is found between samples having similar luminosity but different redshift, suggesting that the structure of the torus does not evolve strongly with redshift. Contrary to previous works, we do not find evidence for an increasing photon index at high Eddington ratio. This may be an indication that the structure of the accretion disc changes as the Eddington ratio approaches unity. Comparing our X-ray spectral analysis results with the optical spectral classification, we find that similar to 20 per cent of optical type-1 AGN show an X-ray absorbing column density higher than 10(21.5) cm(- 2), and about 50 per cent of type-2 AGN have an X-ray absorbing column density less than 10(21.5) cm(- 2). We suggest that the excess X-ray absorption shown in the high-luminosity optical type-1 AGN can be due to small-scale dust-free gas within (or close to) the broad-line region, while in the low-luminosity ones it can be due to a clumpy torus with a large covering factor. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000377471200037 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5325]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany 4.Natl Observ Athens, IAASARS, Penteli 15236, Greece 5.Carnegie Observ, 813 Santa Barbara St, Pasadena, CA 91101 USA 6.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 7.Univ Bologna, Dipartimento Fis & Astron, Viale Berti Pichat 6-2, I-40127 Bologna, Italy 8.Osservatorio Astron Bologna, INAF, Via Ranzani 1, I-40127 Bologna, Italy 9.Inst Astrofis Canarias, E-38200 Tenerife, Spain 10.Univ La Laguna, Dept Astrofis, E-38205 Tenerife, Spain |
| 推荐引用方式 GB/T 7714 | Liu, Zhu,Merloni, Andrea,Georgakakis, Antonis,et al. X-ray spectral properties of the AGN sample in the northern XMM-XXL field[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,459(2):1602-1625. |
| APA | Liu, Zhu.,Merloni, Andrea.,Georgakakis, Antonis.,Menzel, Marie-Luise.,Buchner, Johannes.,...&Streblyanska, Alina.(2016).X-ray spectral properties of the AGN sample in the northern XMM-XXL field.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,459(2),1602-1625. |
| MLA | Liu, Zhu,et al."X-ray spectral properties of the AGN sample in the northern XMM-XXL field".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459.2(2016):1602-1625. |
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