NAOC Open IR
Breaks in the X-Ray Spectra of High-redshift Blazars and the Intervening Medium
Gaur, Haritma1; Mohan, Prashanth2; Pandey, Ashwani3
2021-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume914Issue:1Pages:11
AbstractFlat-spectrum radio quasars (FSRQs) are a subclass of blazars characterized by prominent optical emission lines and a collimated large-scale jet along the observer's line of sight. An X-ray spectral flattening has been reported in FSRQs (at relatively high redshifts) that is attributable either to absorption from gas along the line of sight or to intrinsic jet-based radiative processes. We study a sample of 16 high-redshift FSRQs (z of 1.1-4.7; rest-frame energy up to 50 keV) observed with the XMM-Newton and Swift satellites spanning 29 epochs. The X-ray spectra are fit with a power law including free excess absorption and one multiplied by an exponential roll-off to account for the intrinsic jet-based processes. A statistical analysis is used to distinguish between these models to understand the origin of the spectral flattening. The model selection is unable to distinguish between them in 10 of the 16 FSRQs. Intrinsic jet-based radiative processes are indicated in 4 FSRQs, where we infer energy breaks consistent with their expectation from the external Compton-scattering of low-energy ambient photons. Two of the FSRQs indicate mixed results, supportive of either scenario, illustrating the difficulty of identifying X-ray absorption signatures. A clear detection can be employed to disentangle the relative contributions from the intergalactic medium and the intracluster medium, the method of which is outlined and applied to the latter two sources.
Funding OrganizationNASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; NASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; NASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; NASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital
DOI10.3847/1538-4357/abfa9d
WOS KeywordXMM-NEWTON OBSERVATIONS ; COMPACT STEEP-SPECTRUM ; RADIO-LOUD QUASARS ; INTERGALACTIC MEDIUM ; PARENT POPULATION ; WARM ABSORBER ; GB 1428+4217 ; PKS 0528+134 ; ABSORPTION ; EMISSION
Language英语
Funding ProjectNASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital[IFA17-PH197]
Funding OrganizationNASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; NASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; NASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; NASA ; NASA ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital ; DepartmenDepartment of Science & Technology, India, through the INSPIRE faculty award at ARIES, Nainital
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000661640300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77361
Collection中国科学院国家天文台
Corresponding AuthorGaur, Haritma
Affiliation1.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, India
2.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Indian Inst Astrophys, Block II Kormangala, Bangalore 560034, India
Recommended Citation
GB/T 7714
Gaur, Haritma,Mohan, Prashanth,Pandey, Ashwani. Breaks in the X-Ray Spectra of High-redshift Blazars and the Intervening Medium[J]. ASTROPHYSICAL JOURNAL,2021,914(1):11.
APA Gaur, Haritma,Mohan, Prashanth,&Pandey, Ashwani.(2021).Breaks in the X-Ray Spectra of High-redshift Blazars and the Intervening Medium.ASTROPHYSICAL JOURNAL,914(1),11.
MLA Gaur, Haritma,et al."Breaks in the X-Ray Spectra of High-redshift Blazars and the Intervening Medium".ASTROPHYSICAL JOURNAL 914.1(2021):11.
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