论文标题
向大型恒星形成区域W40的弥漫性伽马射线排放
Diffuse gamma-ray emission toward the massive star-forming region, W40
论文作者
论文摘要
我们报告了对年轻恒星形成区域W40的高能伽马射线信号的检测。使用Fermi大面积望远镜（Fermi-Lat）的10年通行证8个数据，我们提取了一个扩展的伽马射线过量区域，其显着性约为18sigma。辐射的光子指数为2.49 +/- 0.01。与电离气体含量的空间相关性有利于伽马射线发射的耐药来源。伽马射线生产区域中的总宇宙射线（CR）质子能估计为10^47 ERG。但是，这可能是当地加速器在宇宙射线（CRS）中释放的总能量的一小部分，大概是在系统的寿命中，大概是大型恒星。如果是这样，W40以及早期发现Cygnus Cocoon，Westerlund 1，Westerlund 2，NGC 3603和30 DOR C的伽马射线的检测，支持了年轻明星簇是有效的CR工厂的假设。该结果的独特方面是，首次从恒星群集本身中检测到伽马射线发射，而不是从周围的“ Cocoons”中检测到。
We report the detection of high-energy gamma-ray signal towards the young star-forming region, W40. Using 10-year Pass 8 data from the Fermi Large Area Telescope (Fermi-LAT), we extracted an extended gamma-ray excess region with a significance of about 18sigma. The radiation has a spectrum with a photon index of 2.49 +/- 0.01. The spatial correlation with the ionized gas content favors the hadronic origin of the gamma-ray emission. The total cosmic-ray (CR) proton energy in the gamma-ray production region is estimated to be the order of 10^47 erg. However, this could be a small fraction of the total energy released in cosmic rays (CRs) by local accelerators, presumably by massive stars, over the lifetime of the system. If so, W40, together with earlier detections of gamma-rays from Cygnus cocoon, Westerlund 1, Westerlund 2, NGC 3603, and 30 Dor C, supports the hypothesis that young star clusters are effective CR factories. The unique aspect of this result is that the gamma-ray emission is detected, for the first time, from a stellar cluster itself, rather than from the surrounding "cocoons".
