期刊
ASTROPHYSICAL JOURNAL
卷 826, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/826/1/31
关键词
acceleration of particles; ISM: individual objects (G78.2+2.1); ISM: supernova remnants; radiation mechanisms: nonthermal
资金
- PAPIIT-UNAM [IG100414]
- Universidad de Costa Rica
- Natural Sciences and Engineering Research Council of Canada
Analysis of gamma-ray emission from the supernova remnant G78.2+2.1 (gamma Cygni) with 7.2 years of cumulative data from the Fermi Large Area Telescope shows a distinct hard, bright, and extended component to the north of the shell coincident with the known teraelectronvolt source VER J2019+407. In the gigaelectronvolt to teraelectronvolt (GeV-TeV) energy range, its spectrum is best described by a broken power law with indices 1.8 below a break energy of 71 GeV and 2.5 above the break. A broadband spectral energy distribution is assembled, and different scenarios for the origin of the gamma rays are explored. Both hadronic and leptonic mechanisms are able to account for the GeV-TeV observations. In the leptonic framework, a superposition of inverse Compton and nonthermal bremsstrahlung emissions is needed, whereas the hadronic scenario requires a cosmic-ray population described by a broken power-law distribution with a relatively hard spectral index of similar to 1.8 below a break particle energy of 0.45 TeV. In addition, the neutrino flux expected from cosmic-ray interactions is calculated.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据