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题名: HESS J1427-608: AN UNUSUAL HARD, UNBROKEN gamma-RAY SPECTRUM IN A VERY WIDE ENERGY RANGE
作者: Guo, Xiao-Lei; Xin, Yu-Liang; Liao, Neng-Hui; Yuan, Qiang; Gao, Wei-Hong; He, Hao-Ning; Fan, Yi-Zhong; Liu, Si-Ming
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 835, 期号:1, 页码:-
英文摘要: We 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.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17439
Appears in Collections:中国科学院紫金山天文台研究生部_学生文章

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