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Abstract:
Since its discovery by the Fermi Large Area Telescope in 2009, the Galactic center gamma-ray excess (GCE) has been a topic of intense research and debate. Two leading explanations for the GCE ’s origin are a population of millisecond pulsars or the annihilation of dark matter. If the latter explanation is true, it will be the first evidence for dark matter interacts with the Standard Model particles beyond its gravitational influence. In this talk, I will describe our approach to analyzing the GCE using a set of newly developed templates for the galactic diffuse gamma-ray emission (GDE). Our analysis shows that the GCE is approximately spherical and has a high-energy tail at higher significance than previously reported. These findings suggest that the GCE is more likely due to dark matter annihilation. Using these newly developed templates, we conduct a thorough comparison of various alternative GCE morphology models and explore the effects of different masking procedure on the morphology of the GCE.
Biography:
Dr. Yiming Zhong is an assistant professor at the Department of Physics of the City University of Hong Kong. He received his Ph.D. at the C.N. Yang Institute for Theoretical Physics of Stony Brook University in 2016. He was then a postdoctoral associate at Boston University from 2016 to 2019 and a KICP fellow at the Kavli Institute for Cosmological Physics of the University of Chicago from 2019 to 2023. Dr. Zhong's research area lies at the intersection of theoretical particle physics, astrophysics, and cosmology. He was the Chinese translator of the popular science books《时间重生》and《最伟大的智力冒险》.
Alternative online link: https://meeting.tencent.com/dm/mS3UpGi792Fj
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