论文标题
G279.0+1.1：高能伽玛射线的新扩展来源
G279.0+1.1: a new extended source of high-energy gamma rays
论文作者
论文摘要
G279.0+1.1是一个超新星残留物（SNR），其已知参数不佳，首先被检测为昏暗的无线电源，并被归类为进化的系统。对Fermi-LAT的数据进行分析，该数据首次揭示了该区域中伽马射线的扩展来源。发现的GEV区域的直径为〜2.8 $^{\ circ} $，比无线电数据对SNR大小的最新估计值大。伽马射线排放覆盖了大多数已知的壳，并延伸至无线电发射的大部分北部和东部。 0.5--500 GEV范围中的光子谱可以通过简单的功率定律描述，$ \ frac {dn} {de} \ propto e^{ - γ} $，频谱索引为$γ= 1.86 \ pm 0.03_ {stat}} {stat}} \ pm 0.06_ {sys} $ {sys} $。在缓慢的情况下，需要一个陡峭的颗粒光谱，比先前估计的3 kpc的距离低。还研究了已经逃脱了SNR的电子产生的高能发射的可能性。伽玛射线的harronic场景产生的粒子光谱指数为$ \ sim2.0 $，并且距离没有明显的约束。讨论了旧SNR中伽马射线的生产。鼓励对该来源进行更多的观察，以探究壳的真实程度及其年龄。
G279.0+1.1 is a supernova remnant (SNR) with poorly known parameters, first detected as a dim radio source and classified as an evolved system. An analysis of data from the Fermi-LAT revealing for the first time an extended source of gamma rays in the region is presented. The diameter of the GeV region found is ~2.8$^{\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.
