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Constraints on the Location of gamma-Ray Sample of Blazars with Radio Core-shift Measurements
Wu, Linhui1; Wu, Qingwen1; Yan DH(闫大海)2; Chen, Liang3,4; Fan, Xuliang1
Source PublicationASTROPHYSICAL JOURNAL
2018
Volume852Issue:1
DOI10.3847/1538-4357/aa9b7e
Contribution Rank第2完成单位
Indexed BySCI
KeywordBlack Hole Physics Galaxies: Jets Galaxies: Magnetic Fields Gamma Rays: Galaxies Radiation Mechanisms: Non-thermal
Abstract

We model simultaneous or quasi-simultaneous multi-band spectral energy distributions (SEDs) for a sample of 25 blazars that have radio core-shift measurements, where a one-zone leptonic model and Markov chain Monte Carlo technique are adopted. In the SED fitting for 23 low-synchrotron-peaked (LSP) blazars, the seed photons from the broad-line (BLR) and molecular torus are considered respectively in the external Compton process. We find that the SED fitting with the seed photons from the torus are better than those utilizing BLR photons, which suggest that the gamma-ray emitting region may be located outside the BLR. Assuming the magnetic field strength in the gamma-ray emitting region as constrained from the SED fitting follows the magnetic field distribution as derived from the radio core-shift measurements (i.e., B(R) similar or equal to B-1 pc(R/1pc)(-1), where R is the distance from the central engine and B-1 pc is the magnetic field strength at 1 pc), we further calculate the location of the gamma-ray emitting region, R-gamma, for these blazars. We find that R-gamma similar to 2 x 10(4)Rs similar or equal to 10 R-BLR (R-S is the Schwarzschild radius and R-BLR is the BLR size), where R-BLR is estimated from the broad-line luminosities using the empirical correlations obtained using the reverberation mapping methods.

Funding ProjectNSFC[11573009] ; NSFC[11622324] ; NSFC[11233006] ; NSFC[U1431123] ; CAS Light of West China Program ; CAS grant[QYZDJSSW-SYS023]
Funding OrganizationNSFC[11573009, 11622324, 11233006, U1431123] ; CAS Light of West China Program ; CAS grant[QYZDJSSW-SYS023]
Language英语
Subject Area天文学 ; 天体物理学 ; 高能天体物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000419341900007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordACTIVE GALACTIC NUCLEI ; EXTRAGALACTIC BACKGROUND LIGHT ; INVERSE COMPTON-SCATTERING ; SUPERMASSIVE BLACK-HOLES ; FERMI BRIGHT BLAZARS ; BL-LACERTAE OBJECTS ; PARSEC-SCALE JETS ; 3C 454.3 ; MULTIWAVELENGTH OBSERVATIONS ; RELATIVISTIC JETS
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12095
Collection高能天体物理研究组
Corresponding AuthorWu, Qingwen
Affiliation1.School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
2.Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
3.Shanghai Astronomical Observatory, Chinese Academy of Science, 80 Nandan, Shanghai 200030, China
4.University of Chinese Academy of Science, 19A Yuquanlu, Beijing 100049, China
Recommended Citation
GB/T 7714
Wu, Linhui,Wu, Qingwen,Yan DH,et al. Constraints on the Location of gamma-Ray Sample of Blazars with Radio Core-shift Measurements[J]. ASTROPHYSICAL JOURNAL,2018,852(1).
APA Wu, Linhui,Wu, Qingwen,Yan DH,Chen, Liang,&Fan, Xuliang.(2018).Constraints on the Location of gamma-Ray Sample of Blazars with Radio Core-shift Measurements.ASTROPHYSICAL JOURNAL,852(1).
MLA Wu, Linhui,et al."Constraints on the Location of gamma-Ray Sample of Blazars with Radio Core-shift Measurements".ASTROPHYSICAL JOURNAL 852.1(2018).
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