【直播】【中国科大寰宇开物天文讲坛】高能物理研究所Dmitriy Khangulyan教授:GRBs @TeV energies

学术   2024-10-21 00:01   安徽  



中国科大寰宇开物天文讲坛
GRBs @ TeV energies

2024年10月22日 16:00


中国科大寰宇开物天文讲坛是由中国科学技术大学物理学院天文学系主办、蔻享学术协办的天文前沿学术讲坛,内容涉及行星、恒星、星系与活动星系、宇宙大尺度结构、宇宙学等天体物理前沿领域的最新研究进展,致力于为广大天文科研工作者与关注天文研究进展的人们提供一个学术交流与天文知识传播的平台。“寰宇”取自严济慈先生在1988年为科大创办30周年而题写的“创寰宇学府,育天下英才”,“开物”源于中国古代科学著作《天工开物》;“寰宇开物”寓意为力求通晓宇宙中万物——这是天文学研究的不懈追求。The Universe, Yours to Discover!


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报告人介绍






Dmitriy Khangulyan

Prof. Khangulyan obtained his University and PhD degrees from the Moscow Engineering Physics Institute (MEPhI) in 2000 and 2003, respectively, specializing in theoretical physics. From 2004 to 2010, he held a postdoctoral position at the Max-Planck Institute for Nuclear Physics in Heidelberg. Subsequently, from 2010 to 2015, he served as a research fellow at the Japanese Aerospace Exploration Agency in Sagamihara. Following this, he joined Rikkyo University in Tokyo from 2015 to 2023. In May 2024, he assumed a professorship at the Institute of High Energy Physics (IHEP) in Beijing and Tianfu CRRC in Chengdu.



报告摘要


Recently, the observational study of gamma-ray bursts (GRBs) in the very-high-energy (VHE) regime has advanced with several long-awaited detection with MAGIC, H.E.S.S., and LHAASO telescope systems. Currently, the list of GRBs with VHE emission measured with very high significance, 5, contains GRB 190114C, GRB 190829A, and GRB 221009A. Several more bursts were detected with lower significance or reported as source candidates. Detection of GRB afterglows in the VHE regime allows obtaining essential information on particle acceleration by relativistic shock waves. This makes GRB afterglows to be important sources for high-energy astrophysics and their studies have an exceptionally broad scope. Two detected GRBs provided us with exceptionally viable data because of the proximity (GRB 190829A) and record-breaking luminosity (GRB 221009A). In this case, Cherenkov detectors provide us with detailed spectral information and well-measured light curves. In the former case, one H.E.S.S. revealed an unexpectedly long signal duration, up to 56 hours after the trigger, and accurately measuredthe spectrum in a relatively broad energy interval, spanning between 0.18 and 3.3TeV. From the latter GRB, LHAASO detected more than 60,000 photons during the onset of the afterglow, which resulted in unprecedentedly accurate measurement of the light curve and VHE spectrum, which extends beyond 10TeV. The obtained temporal and spectral properties of the VHE emission challenged the earlier prediction and promoted further development of existing models and formulation of new approaches. In this talk and will review the key observational findingsand developments in the modeling.



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