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Gamma-ray luminosity function of BL Lac objects and contribution to the extragalactic gamma-ray background
Qu, Yankun1,2; Zeng, Houdun1; Yan, Dahai3
2019-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume490Issue:1Pages:758-765
Corresponding AuthorZeng, Houdun(zhd@pmo.ac.cn) ; Yan, Dahai(yandahai@ynao.ac.cn)
AbstractUsing a significantly enlarged Fermi-LAT BL Lac objects (BL Lacs) sample, we construct the gamma-ray luminosity function (GLF) of BL Lacs, by the joint use of the space density distribution and source counts distribution. We use three well-studied forms of the GLF, i.e. the forms of pure density evolution (PDE), pure luminosity evolution (PLE), and luminosity-dependent density evolution (LDDE). The Markov Chain Monte Carlo (MCMC) technique is used to constrain model parameters. Our results suggest that LDDE model can give the best description for the BL Lac GLF. And the model shows that the BL Lacs with a harder GeV spectrum and a less luminosity evolve as strongly as flat spectrum radio quasars, and the evolution decreases as increasing luminosity. We also model the average photon spectra of BL Lacs with a double power-laws model. Using this modelled spectra, BL Lacs contribute similar to 20 per cent of the total extragalactic gamma-ray background (EGB) at E > 100 MeV, similar to 100 per cent of the EGB at E > 50 GeV, and the unresolved BL Lacs contribute similar to 20 per cent of the isotropic diffuse gamma-ray background at E > 100 MeV. A prediction of the TeV EGB spectra are given, which may be tested by the future detectors.
Keyword(galaxies:) BL Lacertae objects: general galaxies: evolution gamma rays: diffuse background gamma rays: galaxies
DOI10.1093/mnras/stz2651
WOS KeywordEVOLUTION ; BLAZARS ; EMISSION ; SAMPLE ; ORIGIN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000496922300057
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36576
Collection中国科学院紫金山天文台
Corresponding AuthorZeng, Houdun; Yan, Dahai
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210033, Jiangsu, Peoples R China
2.Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Qu, Yankun,Zeng, Houdun,Yan, Dahai. Gamma-ray luminosity function of BL Lac objects and contribution to the extragalactic gamma-ray background[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,490(1):758-765.
APA Qu, Yankun,Zeng, Houdun,&Yan, Dahai.(2019).Gamma-ray luminosity function of BL Lac objects and contribution to the extragalactic gamma-ray background.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,490(1),758-765.
MLA Qu, Yankun,et al."Gamma-ray luminosity function of BL Lac objects and contribution to the extragalactic gamma-ray background".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 490.1(2019):758-765.
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