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Dependence of the broad Fe K alpha line on the physical parameters of AGN
Liu, Zhu1,2; Yuan, Weimin1,2; Lu, Youjun2,3; Carrera, Francisco J.4; Falocco, Serena6; Dong XB(董小波)6,7
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2016-11-21
Volume463Issue:1Pages:684-695
DOI10.1093/mnras/stw2042
Contribution Rank第6完成单位
Indexed BySCI
KeywordGalaxies: Active X-rays: Galaxies
Abstract

In this paper, the dependence of the broad Fe K alpha line on the physical parameters of AGN, such as the black hole mass M-BH, accretion rate (equivalently represented by Eddington ratio lambda(Edd)) and optical classification is investigated by applying the X-ray spectra stacking method to a large sample of AGN which have well measured optical parameters. A broad-line feature is detected (> 3 sigma) in the stacked spectra of the high lambda(Edd) sub-sample (log lambda(Edd) > -0.9). The profile of the broad line can be well fitted with relativistic broad-line model, with the line energy consistent with highly ionized Fe K alpha line (i.e. Fe xxvi). A model consisting of multiple narrow lines cannot be ruled out, however. We found hints that the Fe K line becomes broader as the lambda(Edd) increases. No broad-line feature is shown in the sub-sample of broad-line Seyfert 1 (BLS1) galaxies and in the full sample, while a broad line might be present, though at low significance, in the sub-sample of narrow-line Seyfert 1 (NLS1) galaxies. We find no strong dependence of the broad line on black hole masses. Our results indicate that the detection/properties of the broad Fe K alpha line may strongly depend on lambda(Edd), which can be explained if the ionization state and/or truncation radius of the accretion disc changes with lambda(Edd). The non-detection of the broad line in the BLS1 sub-sample can be explained if the average equivalent width of the relativistic Fe K alpha line is weak or/and the fraction of sources with relativistic Fe K alpha line is small in BLS1 galaxies.

Funding ProjectNational Natural Science Foundation of China[11473035] ; National Natural Science Foundation of China[11273027] ; National Natural Science Foundation of China[11303046] ; Strategic Priority Research Program The Emergence of Cosmological Structures of the Chinese Academy of Sciences[XDB09000000] ; NSF[11473062] ; MINECO/FEDER[AYA2015-64346-C2-1-P] ; ESA Member States ; NASA
Funding OrganizationNational Natural Science Foundation of China[11473035, 11273027, 11303046] ; Strategic Priority Research Program The Emergence of Cosmological Structures of the Chinese Academy of Sciences[XDB09000000] ; NSF[11473062] ; MINECO/FEDER[AYA2015-64346-C2-1-P] ; ESA Member States ; NASA
Language英语
Subject Area天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000386464900055
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordACTIVE GALACTIC NUCLEI ; ADVECTION-DOMINATED ACCRETION ; DIGITAL SKY SURVEY ; SEYFERT 1 GALAXIES ; PHOTON IMAGING CAMERA ; 2XMM CATALOG SOURCES ; MASSIVE BLACK-HOLE ; RAY SPECTRAL SLOPE ; XMM-NEWTON ; EDDINGTON RATIO
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9754
Collection丽江天文观测站(南方基地)
中国科学院天体结构与演化重点实验室
Corresponding AuthorLiu, Zhu; Yuan, Weimin
Affiliation1.Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
2.University of Chinese Academy of Sciences, School of Astronomy and Space Science, Beijing 100049, China
3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
4.Instituto de Física de Cantabria (CSIC-UC), Avenida de los Castros, E-39005 Santander, Spain
5.KTH Royal Institute of Technology, Department of Physics and the Oskar Klein Centre, AlbaNova, SE-106 91 Stockholm, Sweden
6.Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
7.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, Yunnan 650011, China
Recommended Citation
GB/T 7714
Liu, Zhu,Yuan, Weimin,Lu, Youjun,et al. Dependence of the broad Fe K alpha line on the physical parameters of AGN[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(1):684-695.
APA Liu, Zhu,Yuan, Weimin,Lu, Youjun,Carrera, Francisco J.,Falocco, Serena,&Dong XB.(2016).Dependence of the broad Fe K alpha line on the physical parameters of AGN.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(1),684-695.
MLA Liu, Zhu,et al."Dependence of the broad Fe K alpha line on the physical parameters of AGN".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.1(2016):684-695.
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