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Testing Relativistic Boost as the Cause of Gamma-Ray Quasi-periodic Oscillation in a Blazar
Yan, Dahai1,2; Zhou, Jianeng3; Zhang, Pengfei4,5; Zhu, Qianqian6; Wang, Jiancheng1,2
2018-11-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume867Issue:1Pages:7
Abstract

The mechanism for producing gamma-ray quasi-periodic oscillation (QPO) in blazars is unknown. One possibility is the geometric model, in which without the need for intrinsic quasi-periodic variation, the relativistic Doppler factor changes periodically, resulting in observed gamma-ray QPO. We propose a method to test this geometric model. We analyze the Fermi-LAT data of PG 1553+113 spanning from 2008 August until 2018 February. According to 29 four-month average spectral energy distributions in the energy range of 0.1-300 GeV, we split the Fermi-LAT energy range into three bands: 0.1-1 GeV, 1-10 GeV, and 10-300 GeV. The spectrum in each energy range can be successfully fitted by a power law. The light curves and photon indices in the three energy ranges are obtained. Then, light curves in three narrow energy ranges, i.e., 0.2-0.5 GeV, 2-5 GeV, and 20-40 GeV, are constructed, and the relative variability amplitudes in the three narrow energy ranges are calculated. A discrete-correlation analysis is performed for the light curves. Our results indicate that (i) the light curves in the different energy ranges follow the same pattern showed in the light curve above 0.1 GeV; (ii) the three groups of photon indices in the energy ranges of 0.1-1 GeV, 1-10 GeV, and 10-300 GeV keep nearly constant; and (iii) the ratio between relative variability amplitudes in different narrow energy ranges are equal (within their errors) to the prediction by the Doppler effect. Our results support the scenario of the relativistic boost producing the gamma-ray QPO for PG 1553+113.

Keywordgalaxies: jets gamma rays: galaxies radiation mechanisms: non-thermal
DOI10.3847/1538-4357/aae48a
WOS KeywordX-RAY ; SPECTRAL VARIABILITY ; LIGHT CURVES ; HELICAL JETS ; PG 1553+113 ; EMISSION ; GALAXIES ; PRECESSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000448890000006
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21049
Collection中国科学院紫金山天文台
Corresponding AuthorYan, Dahai
Affiliation1.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China
2.Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
5.Yunnan Univ, Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Yunnan, Peoples R China
6.Nanchang Inst Sci & Technol, Dept Gen Studies, Nanchang 330108, Jiangxi, Peoples R China
Recommended Citation
GB/T 7714
Yan, Dahai,Zhou, Jianeng,Zhang, Pengfei,et al. Testing Relativistic Boost as the Cause of Gamma-Ray Quasi-periodic Oscillation in a Blazar[J]. ASTROPHYSICAL JOURNAL,2018,867(1):7.
APA Yan, Dahai,Zhou, Jianeng,Zhang, Pengfei,Zhu, Qianqian,&Wang, Jiancheng.(2018).Testing Relativistic Boost as the Cause of Gamma-Ray Quasi-periodic Oscillation in a Blazar.ASTROPHYSICAL JOURNAL,867(1),7.
MLA Yan, Dahai,et al."Testing Relativistic Boost as the Cause of Gamma-Ray Quasi-periodic Oscillation in a Blazar".ASTROPHYSICAL JOURNAL 867.1(2018):7.
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