【星海学者】关于于世琦博士非会议来访及学术交流活动的通知

● 来访学者信息/ Bio

Prof. Shiqi Yu is a Research Assistant Professor in the Department of Physics and Astronomy at the University of Utah and a prominent member of the IceCube Collaboration. Her research resides at the frontier of multi-messenger astrophysics, where she leverages advanced computational methods and theoretical modeling to investigate high-energy neutrino sources. Prof. Yu led the identification of the first evidence for collective neutrino emission from Active Galactic Nuclei in the Southern sky. Her contributions to fundamental particle physics include leading the development of CNN-based reconstructions for the IceCube DeepCore sub-detector and the first 10-year atmospheric muon neutrino disappearance measurement, which achieved record-setting precision. Regarding leadership within IceCube, Prof. Yu is a former co-lead of the Reconstruction and Machine Learning working group. She was also an elected co-representative of early career scientists and is a current member of the IceCube Speakers Committee.

● 日程安排/ Agenda

● 报告题目和摘要/Lectures and Seminar title and abstract:

Lecture : Evidence of Neutrino Emission from X-ray Bright Seyfert Galaxies with IceCube

Abstract:

The IceCube Neutrino Observatory is a cubic-kilometer detector at the South Pole deep in the Antarctic ice that identifies high-energy neutrinos by detecting Cherenkov radiation. Following IceCube’s detection of TeV neutrinos from NGC 1068, more X-ray bright Seyfert galaxies have been selected based on their intrinsic X-ray luminosities and investigated using IceCube data. In this study, a coronal model where cosmic-ray acceleration and hadronic interactions occur near the AGN engine has been employed, linking X-ray and neutrino luminosities, providing physically motivated spectral shapes and stacking weights to enhance discovery potential. In this talk, I will present the outcomes of the studies on X-ray bright Seyfert galaxies and compare the results of using the coronal model with generic power-law assumptions.

Seminar：IceCube Over a Decade: From Neutrino Oscillations to Multi-Messenger Astronomy

Abstract:

Neutrinos provide a unique window into both fundamental physics and the high-energy universe. As smoking gun of hadronic processes, they play a central role in multi-messenger astrophysics. The IceCube Neutrino Observatory, a cubic-kilometer-scale Cherenkov detector embedded deep in the Antarctic ice, has become a leading instrument for exploring these frontiers over the past decade.

Its primary array enables the detection of TeV–PeV neutrinos from astrophysical sources, while DeepCore, a densely instrumented sub-array at the bottom of the detector, extends sensitivity down to GeV energies, allowing precision studies of atmospheric neutrinos.

In this talk, I will present key IceCube results spanning this broad energy range. At low energies, I will discuss measurements of atmospheric neutrino oscillations in the 5–100 GeV regime. At high energies, I will highlight recent studies on potential neutrino sources, including extragalactic candidates such as Seyfert galaxies and low-luminosity gamma-ray bursts, as well as Galactic PeVatron candidates, particularly microquasars. Together, these results demonstrate neutrino telescope's unique capability in particle physics and astrophysics, advancing our understanding of both neutrino properties and the origin of cosmic rays. 

● 其他

1. 欢迎全体师生积极参与学术报告和科研讨论，并鼓励与来访学者交流互动，共同探讨科研问题。于世琦博士在所期间为2026年3月23日- 3月29日，办公室位于多学科大楼336，欢迎大家前往交流。

2. 此次来访是与来访学者建立长期合作的良好契机，请大家充分利用此次机会与来访学者探讨合作方向，推动形成论文等合作成果。