Fermi Large Area Telescope Observations of the Kes 73/1E 1841-045 Region: An Attempted Search for Gamma-ray Excess from a Magnetar

主讲人 (Speaker): 杨健恒 研究生

主讲人单位 (Speaker's Institute): 台湾清华大学

时间 (Time): 星期一, 2017/04/10 - 10:30 to 11:30

地点 (Location): 珠海校区海滨红楼17栋107会议室

摘要 (Abstract):

The supernova remnant Kes 73 and/or the magnetar 1E 1841-045 at its center can deposit a large amount of energy to the surroundings and is potentially responsible for particle acceleration. Using the data taken with the Fermi Large Area Telescope (LAT), we confirmed the presence of an extended source whose centroid position is highly consistent with this magnetar/supernova-remnant pair. Its emission is intense from 100 MeV to >100 GeV. Its LAT spectrum can be decoupled into two components which are respectively governed by two different mechanisms. According to the young age of this system, the magnetar is seemingly a necessary and sufficient source for the downward-curved spectrum below 10 GeV, as the observed <10 GeV flux is too high for the supernova remnant to account for. On the other hand, the supernova remnant is reasonably responsible for the hard spectrum above 10 GeV. Further studies of this region in the TeV regime is required, so that we can perform physically meaningful comparisons of the >10 GeV spectrum and the TeV spectrum.

主讲人简介 (Speaker's CV):

杨健恒2014年在香港大学物理系本科毕业，现于台湾清华大学攻读硕士学位，使用费米的数据进行磁星相关研究，已在ApJ发表了两篇第一作者文章。