论文标题
新发现的GEV伽马射线源Fermi J1242.5+3236的可能起源
Possible Origin of a Newly Discovered GeV Gamma-ray Source Fermi J1242.5+3236
论文作者
论文摘要
基于能量范围从300 MeV到500 GEV的Fermi科学数据的前13.4年，我们发现了一个明亮的Gev伽马射线源，$ \ sim $ 5.64 $σ$检测，名为Fermi J1242.5+3236，它具有与近似于0fdg0996的距Fermi J1242.5+3236的检测显着性约为4.72 $σ$。 Fermi J1242.5+3236是一个稳定的点源，没有明显的时间变异性，并且硬γ射线光子指数约为-1.60 $ \ pm $ 0.24。空间偏移和硬伽玛射线光谱不利于此源，因为该银河系的弥漫性伽马射线发射。这个新来源可能具有不明的背景Blazar的可能起源，这很可能是其坚硬的伽马射线光子指数的高同步螺旋式Blazar。随访光学观察将有助于区分费米J1242.5+3236的起源。
Based on the first 13.4 yr of Fermi science data in the energy range from 300 MeV to 500 GeV, we discovered a bright GeV gamma-ray source with a $\sim$5.64 $σ$ detection, named Fermi J1242.5+3236, which has an offset of about 0fdg0996 from a nearby star-forming galaxy NGC 4631. When using the 12-yr data, the detection significance of Fermi J1242.5+3236 is about 4.72 $σ$. Fermi J1242.5+3236 is a steady point source without significant temporal variability and has a hard gamma-ray photon index of about -1.60 $\pm$0.24. The spatial offset and the hard gamma-ray spectrum disfavor this source as the diffuse gamma-ray emission from this galaxy. This new source might have a possible origin of an unidentified background blazar, which is more likely a high-synchrotron-peaked blazar for its hard gamma-ray photon index. A follow-up optical observation would help distinguish origin of Fermi J1242.5+3236.
