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HESS J1427-608: AN UNUSUAL HARD, UNBROKEN gamma-RAY SPECTRUM IN A VERY WIDE ENERGY RANGE
Guo, Xiao-Lei1,2,3; Xin, Yu-Liang3,4; Liao, Neng-Hui3; Yuan, Qiang3; Gao, Wei-Hong1,2; He, Hao-Ning3; Fan, Yi-Zhong3; Liu, Si-Ming3
2017-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume835Issue:1Pages:7
Corresponding AuthorYuan, Qiang(yuanq@pmo.ac.cn)
AbstractWe report the detection of a GeV gamma-ray source that. spatially overlaps. and is. thus very likely associated with the unidentified very. high. energy (VHE) gamma-ray source HESS J1427-608 with the Pass 8 data recorded by the Fermi Large Area Telescope. The photon spectrum of this source is best described by a power law with an index of 1.85 +/- 0.17 in the energy range of 3-500 GeV, and the measured flux connects smoothly with that of HESS J1427 -608 at a few hundred gigaelectronvolts. This source shows no significant extension and time variation. The broadband GeV to TeV emission over four decades of energies can be well fitted by a single power-law function with an index of 2.0, without obvious indication of spectral cutoff toward high energies. Such a result implies that HESS J1427-608 may be a PeV particle accelerator. We discuss the possible nature of HESS J1427-608 according to the multiwavelength spectral fittings. Given the relatively large errors, either a leptonic or a hadronic model can explain the multiwavelength data from radio to VHE gamma-rays. The inferred magnetic field strength is a few micro-Gauss, which is smaller than the. typical values of supernova remnants (SNRs). and is consistent with some pulsar wind nebulae (PWNe). On the other hand, the flat gamma-ray spectrum is slightly different from typical PWNe but is. similar to that of some known SNRs.
Keywordgamma rays: general gamma rays: ISM ISM: individual objects (HESS J1427-608) ISM: supernova remnants radiation mechanisms: nonthermal
DOI10.3847/1538-4357/835/1/42
WOS KeywordLARGE-AREA TELESCOPE ; PULSAR WIND NEBULAE ; INTERSTELLAR RADIATION-FIELD ; SUPERNOVA REMNANT CASSIOPEIA ; FERMI-LAT DISCOVERY ; SOURCE CATALOG ; RX J1713.7-3946 ; SN 1006 ; EMISSION ; POPULATION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000393455400042
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23331
Collection中国科学院紫金山天文台
Corresponding AuthorYuan, Qiang
Affiliation1.Nanjing Normal Univ, Dept Phys, Nanjing 210046, Jiangsu, Peoples R China
2.Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210046, Jiangsu, Peoples R China
3.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Guo, Xiao-Lei,Xin, Yu-Liang,Liao, Neng-Hui,et al. HESS J1427-608: AN UNUSUAL HARD, UNBROKEN gamma-RAY SPECTRUM IN A VERY WIDE ENERGY RANGE[J]. ASTROPHYSICAL JOURNAL,2017,835(1):7.
APA Guo, Xiao-Lei.,Xin, Yu-Liang.,Liao, Neng-Hui.,Yuan, Qiang.,Gao, Wei-Hong.,...&Liu, Si-Ming.(2017).HESS J1427-608: AN UNUSUAL HARD, UNBROKEN gamma-RAY SPECTRUM IN A VERY WIDE ENERGY RANGE.ASTROPHYSICAL JOURNAL,835(1),7.
MLA Guo, Xiao-Lei,et al."HESS J1427-608: AN UNUSUAL HARD, UNBROKEN gamma-RAY SPECTRUM IN A VERY WIDE ENERGY RANGE".ASTROPHYSICAL JOURNAL 835.1(2017):7.
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