Abstract: 

The Fermi-LAT collaboration has released a new point source catalog, referred to as 4FGL. For the first time, we perform a template fit using information from this new catalog and find that the Galactic center excess is still present. On the other hand, we find that a wavelet-based search for point sources is highly sensitive to the use of the 4FGL catalog: no excess of bright regions on small angular scales is apparent when we mask out 4FGL point sources. We postulate that the 4FGL catalog contains the large majority of bright point sources that have previously been suggested to account for the excess in gamma rays detected at the Galactic center in Fermi-LAT data. Furthermore, after identifying which bright sources have no known counterpart, we place constraints on the luminosity function necessary for point sources to explain the smooth emission seen in the template fit. Further details can be found in arXiv: 1911.12369.

About the speaker:

鐘益鳴(Yiming Zhong)博士于2009年南開大學本科畢業，2010年加拿大圓周理論物理研究所碩士畢業，2010-2016年在紐約州立大學石溪分校博士畢業，2016-2019年在波士頓大學做博士後研究，2019年至今在芝加哥大學大學任KICP fellow。現在主要做粒子物理理論，特别是暗物質物理。

Online: Tencent/VOOV Meeting (騰訊會議) ID: 335 2914 1087