Evidence of a Spectral Break in the Gamma-Ray Emission of the Disk Component of the Large Magellanic Cloud: A Hadronic Origin?

被引：6
作者：
Tang, Qing-Wen [1 ,2 ]
Peng, Fang-Kun [2 ,3 ]
Liu, Ruo-Yu [4 ]
Tam, Pak-Hin Thomas [5 ]
Wang, Xiang-Yu [2 ,3 ]
机构：
[1] Nanchang Univ, Dept Phys, Nanchang 330031, Jiangxi, Peoples R China
[2] Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
[4] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[5] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2017年 / 843卷 / 01期
关键词：
cosmic rays; galaxies: individual (LMC); gamma rays: galaxies; LARGE-AREA TELESCOPE; STARBURST GALAXIES M82; FARADAY-ROTATION; MAGNETIC-FIELD; STAR-FORMATION; FERMI-LAT; NGC; 253; ARP; 220;
D O I：
10.3847/1538-4357/aa7464
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
It has been suggested that the high-energy gamma-ray emission (> 100 MeV) of nearby star-forming galaxies may be produced predominantly by cosmic rays colliding with the interstellar medium through neutral pion decay. The pion decay mechanism predicts a unique spectral signature in the gamma-ray spectrum, characterized by a fast-rising spectrum (in (EF)-F-2(E) representation) and a spectral break below a few hundred MeV. Here, we report evidence of a spectral break, around 500. MeV in the disk emission of the Large Magellanic Cloud (LMC), that was found during an analysis of the gamma-ray data extending down to 60 MeV, observed by the Fermi-Large Area Telescope. The break is consistent with the pion decay model of gamma-ray emission, although leptonic models, such as electron bremsstrahlung emission, cannot be ruled out completely.
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页数：9
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