Revisiting SNR Puppis A with Seven Years of Fermi Large Area Telescope Observations

被引：16
|
作者：
Xin, Yu-Liang [1 ,2 ]
Guo, Xiao-Lei [1 ,3 ,4 ]
Liao, Neng-Hui [1 ,5 ]
Yuan, Qiang [1 ,5 ]
Liu, Si-Ming [1 ,5 ]
Wei, Da-Ming [1 ,5 ]
机构：
[1] Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China
[2] Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China
[3] Nanjing Normal Univ, Dept Phys, Nanjing 210046, Jiangsu, Peoples R China
[4] Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210046, Jiangsu, Peoples R China
[5] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2017年 / 843卷 / 02期
基金：
中国国家自然科学基金;
关键词：
gamma rays: general; ISM: supernova remnants; radiation mechanisms: non-thermal; GAMMA-RAY EMISSION; SUPERNOVA REMNANT PUPPIS; ACCUMULATED DIFFUSIVE PROTONS; GALACTIC COSMIC-RAYS; BRIGHT EASTERN KNOT; QUIET NEUTRON-STAR; EMITTING EJECTA; SOURCE CATALOG; RX J0822-4300; LAT;
D O I：
10.3847/1538-4357/aa74bb
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Puppis A is a very famous and extensively studied supernova remnant that shows strong evidence of shock-cloud interaction. We reanalyze its GeV gamma-ray emission using seven years of Pass 8 data recorded by the Fermi Large Area Telescope. The morphology of the gamma-ray emission is more compatible with that of the thermal X-ray and IR emissions than the radio image, which suggests a possible correlation between the gamma-ray-emitting region and dense clouds. The gamma-ray spectrum in the energy range of 1-500 GeV shows a break at 7.92 +/- 1.91 GeV, with photon indices of 1.81 +/- 0.08 below the break and 2.53 +/- 0.12 above the break, which can naturally explain the lack of TeV gamma-ray emission from Puppis A. The multi-wavelength observations favor a hadronic origin for the gamma-ray emission.
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页数：8
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