BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Fast Radio Burst Counterparts: Multi-wavelength Clues to their Nat ure and Origin DTSTART:20260923T060000Z DTEND:20260923T070000Z DTSTAMP:20260923T085000Z UID:indico-event-5312@indico-tdli.sjtu.edu.cn DESCRIPTION:Speakers: Wenfei Yu(余文飞) (SHAO)\n\nHost: Dong LaiJoin T encent Meeting：https://meeting.tencent.com/dm/INupzDcjoHq5Meeting ID: 63 3652577 (no password）\nAbstract:Fast Radio Bursts (FRBs) are bright\, sh ort (typically millisecond-duration)\, and narrow-band (typically a few hu ndred MHz) radio bursts of unknown cosmic origin. The discovery of astroph ysical counterparts to FRBs would allow direct probes of the immediate env ironment and even the birth site of the burst engine. Among the more than 1000 distinct FRB sources detected to date\, only a small fraction have be en identified as repeaters. These repeaters exhibit distinct “active” and “quiescent” episodes. During highly active periods\, they provide the best opportunities for sub-arcsecond localization to identify their ho st galaxies and potential multi-wavelength counterparts. Recent observatio ns have only been able to confirm 4-5 compact radio continuum counterparts associated with repeating FRBs. Our team discovered two of these—the ra dio continuum counterparts to FRB 20190520B and FRB 20240114A—through in terferometric observations. In this talk\, I will focus on the hyperactive source FRB 20240114A and present unique temporal\, spectral\, and evoluti onary evidence for an explosive transient\, likely associated with a newbo rn compact object. Specifically\, it is the first FRB radio continuum coun terpart observed to behave as a slow radio transient\, similar to engine-p owered radio supernovae. It is also the first FRB radio counterpart convin cingly detected with evolving synchrotron self-absorption (SSA) spectra\, constraining the size and magnetic field of the radio source to values mor e than an order of magnitude more extreme than those of any other known FR B counterpart. Our tentative detection of sub-minute gamma-ray flares from the FRB source\, combined with the detection of evolving radio SSA spectr a in the radio counterpart\, suggests a promising strategy for future sear ches for newborn FRB sources to reveal the origin of FRBs.\nBiography:Prof . Wenfei Yu began his graduate studies in black hole accretion theory at C entral China Normal University\, where he earned his MSc\, before obtainin g his Ph.D. in particle physics from the Institute of High Energy Physics (IHEP)\, Chinese Academy of Sciences. His doctoral thesis earned the Natio nal Excellent Ph.D. Thesis Award in 2000. He subsequently conducted postdo ctoral research in X-ray astronomy and relativistic astrophysics at the An ton Pannekoek Institute for Astronomy (University of Amsterdam) and the Ph ysics Department of the University of Illinois at Urbana-Champaign. In lat e 2006\, he established the Observational High-Energy Astrophysics Group a t the Shanghai Astronomical Observatory. Since then\, his group has extend ed observational studies from X-ray/gamma-ray wavelengths to the optical a nd the radio wavelengths\, accompanied by the scientific advance into time -domain astronomy\, by conducting competitive\, simultaneous and/or  coor dinated space- and ground-based multi-wavelength observations of high-ener gy and relativistic transients\, including black hole transients and fast radio bursts (FRBs). His expertise centers on multi-wavelength timing obse rvations of compact objects and space-borne/ground-based follow-up observa tions of high-energy and radio transients\, with a focus and interest on t he physics of compact objects under extreme conditions usually probed on t ime scales as short as milliseconds. Recent achievements by his group and collaborators include: (1) the discovery of two compact radio counterparts to FRBs (out of approximately four to five confirmed compact radio counte rparts among more than 1\,000 distinct burst sources) exhibiting continuum emission\; and (2) the detection of the most relativistic jet ejections e ver observed from Galactic microquasars\, with the Lorentz factor exceedin g about 8. In addition to frontier research\, he has also played major rol es in science working groups for several major space- and ground-based ast ronomical missions or facilities\, including the ultra-dense matter physic s of the enhanced X-ray Timing and Polarimetry (eXTP) mission\, the Key Sc ience Project on FRBs for the Five-hundred-meter Aperture Spherical radio Telescope (FAST)\, and the radio transient science of the Square Kilometre Array (SKA). To promote international collaboration in space astronomy\, he currently serves as Vice-Chair of COSPAR Scientific Commission E: Resea rch in Astrophysics from Space.\n\n\nhttps://indico-tdli.sjtu.edu.cn/event /5312/ LOCATION:Tsung-Dao Lee Institute/S4F-SW - Open Area (Tsung-Dao Lee Institu te) URL:https://indico-tdli.sjtu.edu.cn/event/5312/ END:VEVENT END:VCALENDAR