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arXiv 2001.08920astro-ph.HE
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G279 .0+1.1:一个新的高能γ射线扩展源

G279.0+1.1: a new extended source of high-energy gamma rays

Miguel Araya

摘要:

G279.0+1.1是一颗超新星遗迹,其参数知之甚少,最初被发现为一个昏暗的射电源,并被归类为演化系统。费米-LAT的数据分析首次揭示了该地区的伽马射线扩展源。发现的GeV区域的直径约为2.8 $^{\circ}$,大于无线电数据对SNR大小的最新估计。伽马射线辐射覆盖了大部分已知的壳层,并进一步延伸到射电辐射的北部和东部。在0.5- 500 GeV范围内的光子谱可以用一个简单的幂律$\frac{dN}{dE} \propto E^{-Γ}$来描述,其谱指数为$Γ= 1.86\pm 0.03_{stat} \pm 0.06_{sys}$。在轻子的情况下,需要一个陡峭的粒子谱,距离低于以前估计的值3千秒差距是有利的。高能发射的可能性,从电子已经逃脱的SNR的结果也进行了研究。一个强子的情况下,伽马射线产生的粒子光谱指数$\sim2.0$和没有显着的限制的距离。讨论了老信噪比中γ射线的产生。鼓励对这个来源进行更多的观察,以探索贝壳的真实范围及其年龄。

英文摘要:

G279.0+1.1 is a supernova remnant (SNR) with poorly known parameters, first detected as a dim radio source and classified as an evolved system. An analysis of data from the Fermi-LAT revealing for the first time an extended source of gamma rays in the region is presented. The diameter of the GeV region found is ~2.8$^{\circ}$, larger than the latest estimate of the SNR size from radio data. The gamma-ray emission covers most of the known shell and extends further to the north and east of the bulk of the radio emission. The photon spectrum in the 0.5--500 GeV range can be described by a simple power law, $\frac{dN}{dE} \propto E^{-Γ}$, with a spectral index of $Γ= 1.86\pm 0.03_{stat} \pm 0.06_{sys}$. In the leptonic scenario, a steep particle spectrum is required and a distance lower than the previously estimated value of 3 kpc is favored. The possibility that the high-energy emission results from electrons that already escaped the SNR is also investigated. A hadronic scenario for the gamma rays yields a particle spectral index of $\sim2.0$ and no significant constraints on the distance. The production of gamma rays in old SNRs is discussed. More observations of this source are encouraged to probe the true extent of the shell and its age.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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