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Bethe-Heitler cascades as a plausible origin of hard spectra in distant TeV blazars
Zheng, Y. G.1; Yang CY(杨初源)2,3; Kang, S. J.4
Source PublicationASTRONOMY & ASTROPHYSICS
2016
Volume585
DOI10.1051/0004-6361/201526703
Contribution Rank第2完成单位
Indexed BySCI ; EI
KeywordBl Lacertae Objects: Individual: 1es 0229+200 Radiation Mechanisms: Non-thermal
Abstract

Context. Very high-energy (VHE) gamma-ray measurements of distant TeV blazars can be nicely explained by TeV spectra induced by ultra high-energy cosmic rays. Aims. We develop a model for a plausible origin of hard spectra in distant TeV blazars. 

Methods. In the model, the TeV emission in distant TeV blazars is dominated by two mixed components. The first is the internal component with the photon energy around 1 TeV produced by inverse Compton scattering of the relativistic electrons on the synchrotron photons (SSC) with a correction for extragalactic background light absorbtion and the other is the external component with the photon energy more than 1 TeV produced by the cascade emission from high-energy protons propagating through intergalactic space. 

Results. Assuming suitable model parameters, we apply the model to observed spectra of distant TeV blazars of 1ES 0229+ 200. Our results show that 1) the observed spectrum properties of 1ES 0229+ 200, especially the TeV gamma-ray tail of the observed spectra, could be reproduced in our model and 2) an expected TeV gamma-ray spectrum with photon energy > 1 TeV of 1ES 0229+ 200 should be comparable with the 50-h sensitivity goal of the Cherenkov Telescope Array (CTA) and the differential sensitivity curve for the one-year observation with the Large High Altitude Air Shower Observatory (LHAASO). 

Conclusions. We argue that strong evidence for the Bethe-Heitler cascades along the line of sight as a plausible origin of hard spectra in distant TeV blazars could be obtained from VHE observations with CTA, LHAASO, HAWC, and HiSCORE.

Funding ProjectNational Natural Science Foundation of China[11463007] ; National Natural Science Foundation of China[U1231203] ; Science and Technology in support of Yunnan Province Talent[2012HB014] ; Natural Science Foundation of Yunnan Province[2013FD014] ; Science Foundation of Yunnan educational department[2012Z016]
Funding OrganizationNational Natural Science Foundation of China[11463007, U1231203] ; Science and Technology in support of Yunnan Province Talent[2012HB014] ; Natural Science Foundation of Yunnan Province[2013FD014] ; Science Foundation of Yunnan educational department[2012Z016]
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
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000369710300015
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordEXTRAGALACTIC BACKGROUND LIGHT ; ACTIVE GALACTIC NUCLEI ; GAMMA-RAY SPECTRA ; BL-LAC OBJECTS ; INTERGALACTIC MAGNETIC-FIELDS ; HIGH-ENERGY EMISSION ; SELF-COMPTON MODEL ; 1ES 0229+200 ; COSMIC-RAYS ; LACERTAE OBJECTS
EI Accession Number20155001674874
EI KeywordsTellurium compounds
EI Classification Number57Space Physics - 657.2Extraterrestrial Physics and Stellar Phenomena - 931.3Atomic and Molecular Physics
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9339
Collection高能天体物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorZheng, Y. G.
Affiliation1.Department of Physics, Yunnan Normal University, 650092 Kunming, PR China
2.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, PR China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 100049 Beijing, PR China
4.Department of Physics and Electronics Science, Liupanshui Normal University, Liupanshui, 553004 Guizhou, PR China
Recommended Citation
GB/T 7714
Zheng, Y. G.,Yang CY,Kang, S. J.. Bethe-Heitler cascades as a plausible origin of hard spectra in distant TeV blazars[J]. ASTRONOMY & ASTROPHYSICS,2016,585.
APA Zheng, Y. G.,Yang CY,&Kang, S. J..(2016).Bethe-Heitler cascades as a plausible origin of hard spectra in distant TeV blazars.ASTRONOMY & ASTROPHYSICS,585.
MLA Zheng, Y. G.,et al."Bethe-Heitler cascades as a plausible origin of hard spectra in distant TeV blazars".ASTRONOMY & ASTROPHYSICS 585(2016).
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