| Evolution of the luminosity function and obscuration of active galactic nuclei: comparison between X-ray and infrared | |
Han YK(韩云坤)1,2,3 ; Dai, BZ4; Wang B(王博)1,3; Zhang FH(张奉辉)1,3; Han ZW(韩占文)1,3; Han, YK (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
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| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 2012-06 | |
| 卷号 | 423期号:1页码:464-477 |
| DOI | 10.1111/j.1365-2966.2012.20890.x |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Galaxies: Active Galaxies: Evolution Galaxies: Formation Infrared: Galaxies Galaxies: Luminosity Function X-rays: Galaxies Mass Function |
| 摘要 | We present a detailed comparison between the 210 keV hard X-ray and infrared (IR) luminosity functions (LFs) of active galactic nuclei (AGNs). The composite X-ray to IR spectral energy distributions (SEDs) of AGNs, which are used to compare the hard X-ray LF (HXLF) and the IRLF, are modelled with a simple, but well-tested torus model, based on the radiative transfer and photoionization code, cloudy. Four observational determinations of the evolution of the 210 keV HXLF and six evolution models of the obscured type 2 AGN fraction (f2) are considered. The 8.0- and 15-m LFs for unobscured type 1, obscured type 2 and all AGNs are predicted from the HXLFs, and then compared with the measurements currently available. We find that the IRLFs predicted from the HXLFs tend to underestimate the number of the most IR-luminous AGNs. This is independent of the choices of HXLF and f2, and this is even more obvious for the HXLFs recently measured. We show that the discrepancy between the HXLFs and IRLFs can be largely resolved when the anticorrelation between the ultraviolet (UV) to X-ray slope aox and UV luminosity LUV is appropriately considered. We also discuss other possible explanations for the discrepancy, such as the missing population of Compton-thick AGNs and the possible contribution of star formation in the host to the mid-IR. Meanwhile, we find that the HXLFs and IRLFs of AGNs might be more consistent with each other if the obscuration mechanisms of quasars and Seyferts are assumed to be different, corresponding to their different triggering and fuelling mechanisms. In order to clarify these interesting issues, it would be very helpful to obtain more accurate measurements of the IRLFs of AGNs, especially those determined at smaller redshift bins, and to more accurately separate the measurements for type 1 and type 2 AGNs. |
| 项目资助者 | National Natural Science Foundation of China [10778702, 11033008, 11063003, 11103072] ; National Basic Research Programme of China [2009CB824800] ; Chinese Academy of Sciences [KJCX2-YW-T24] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| 归档日期 | 2012-06-06 |
| WOS记录号 | WOS:000304599100035 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | SUPERMASSIVE BLACK-HOLES ; DIGITAL-SKY-SURVEY ; SPECTRAL ENERGY-DISTRIBUTIONS ; NEWTON SERENDIPITOUS SURVEY ; ABSORBING COLUMN DENSITIES ; QUASI-STELLAR OBJECTS ; RADIO-LOUD QUASARS ; SEYFERT 2 GALAXIES ; AGN DUSTY TORI ; HOST GALAXIES |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/4535 |
| 专题 | 大样本恒星演化研究组 中国科学院天体结构与演化重点实验室 |
| 通讯作者 | Han, YK (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, the Chinese Academy of Sciences, Kunming 650011, China 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 4.Department of Physics, Yunnan University, Kunming 650091, China |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 GB/T 7714 | Han YK,Dai, BZ,Wang B,et al. Evolution of the luminosity function and obscuration of active galactic nuclei: comparison between X-ray and infrared[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,423(1):464-477. |
| APA | Han YK,Dai, BZ,Wang B,Zhang FH,Han ZW,&Han, YK .(2012).Evolution of the luminosity function and obscuration of active galactic nuclei: comparison between X-ray and infrared.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,423(1),464-477. |
| MLA | Han YK,et al."Evolution of the luminosity function and obscuration of active galactic nuclei: comparison between X-ray and infrared".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 423.1(2012):464-477. |
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| Evolution of the lum（1924KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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