OBSCURATION-DEPENDENT EVOLUTION OF ACTIVE GALACTIC NUCLEI
文献类型：期刊论文
| 作者 | Buchner, Johannes1; Georgakakis, Antonis1,2; Nandra, Kirpal1; Brightman, Murray1,3; Menzel, Marie-Luise1; Liu, Zhu4 ; Hsu, Li-Ting1; Salvato, Mara1; Rangel, Cyprian5; Aird, James6
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2015-04-01 |
| 卷号 | 802期号:2 |
| 关键词 | galaxies: active quasars: supermassive black holes surveys X-rays: galaxies |
| 英文摘要 | We aim to constrain the evolution of active galactic nuclei (AGNs) as a function of obscuration using an X-ray-selected sample of similar to 2000 AGNs from a multi-tiered survey including the CDFS, AEGIS-XD, COSMOS, and XMM-XXL fields. The spectra of individual X-ray sources are analyzed using a Bayesian methodology with a physically realistic model to infer the posterior distribution of the hydrogen column density and intrinsic X-ray luminosity. We develop a novel non-parametric method that allows us to robustly infer the distribution of the AGN population in X-ray luminosity, redshift, and obscuring column density, relying only on minimal smoothness assumptions. Our analysis properly incorporates uncertainties from low count spectra, photometric redshift measurements, association incompleteness, and the limited sample size. We find that obscured AGNs with N-H > 10(22) cm(-2) account for 77(-5)(+4)% of the number density and luminosity density of the accretion supermassive black hole population with L-X > 10(43) erg s(-1), averaged over cosmic time. Compton-thick AGNs account for approximately half the number and luminosity density of the obscured population, and 38(-7)(+8)% of the total. We also find evidence that the evolution is obscuration dependent, with the strongest evolution around N-H approximate to 10(23) cm(-2). We highlight this by measuring the obscured fraction in Compton-thin AGNs, which increases toward z similar to 3, where it is 25% higher than the local value. In contrast, the fraction of Compton-thick AGNs is consistent with being constant at approximate to 35%, independent of redshift and accretion luminosity. We discuss our findings in the context of existing models and conclude that the observed evolution is, to first order, a side effect of anti-hierarchical growth. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000353014500017 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5763]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany 2.Natl Observ Athens, Athens 11532, Greece 3.CALTECH, Cahill Ctr Astrophys, Pasadena, CA 91125 USA 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 5.Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, London SW7 2AZ, England 6.Univ Durham, Dept Phys, Durham DH1 3LE, England 7.Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA |
| 推荐引用方式 GB/T 7714 | Buchner, Johannes,Georgakakis, Antonis,Nandra, Kirpal,et al. OBSCURATION-DEPENDENT EVOLUTION OF ACTIVE GALACTIC NUCLEI[J]. ASTROPHYSICAL JOURNAL,2015,802(2). |
| APA | Buchner, Johannes.,Georgakakis, Antonis.,Nandra, Kirpal.,Brightman, Murray.,Menzel, Marie-Luise.,...&Ross, Nicholas.(2015).OBSCURATION-DEPENDENT EVOLUTION OF ACTIVE GALACTIC NUCLEI.ASTROPHYSICAL JOURNAL,802(2). |
| MLA | Buchner, Johannes,et al."OBSCURATION-DEPENDENT EVOLUTION OF ACTIVE GALACTIC NUCLEI".ASTROPHYSICAL JOURNAL 802.2(2015). |
入库方式： OAI收割
来源：国家天文台
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