Evolution of the luminosity function and obscuration of active galactic nuclei: comparison between X-ray and infrared

	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
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-06
卷号	423 期号:1 页码:464-477
关键词	galaxies: active galaxies: evolution galaxies: formation galaxies: luminosity function, mass function infrared: galaxies X-rays: galaxies
ISSN号	0035-8711
通讯作者	Han, YK (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	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
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/423/1/464
语种	英语
WOS记录号	WOS:000304599100035
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4535]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
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
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.(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.