[행사/세미나] [Seminar] Dec. 20(Tue.) Studying TeV Gamma-Ray Microquasars with the HAWC Observatory
- 물리학과
- 조회수3048
- 2022-12-01
핵천체물리실험연구실에서 서울시립대학교의 노창동 박사님을 초청하여 아래와 같이 세미나를 개최합니다.
학과 구성원 여러분의 많은 참여를 부탁 드립니다.
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○ Topic: Studying TeV Gamma-Ray Microquasars with the HAWC Observatory
○ Speaker: 노 창 동 박사님 (서울시립대학교)
○ Date/time: 2022. 12. 20. (Tue.) 4:00 PM
○ Place: Natural Science 1, Room No. 31317
○ Abstract: Astrophysical sources of very-high-energy (VHE) gamma-ray radiation provide unique information about astrophysical particle acceleration and cosmic-ray production. In particular, compact binary systems, composed of a compact object (a neutron star or black hole) in orbit with a massive stellar companion, provide an ideal environment for VHE gamma-ray production. They are not only powerful particle accelerators, but they also exhibit periodic emission that makes them excellent astrophysical laboratories. However, only a handful of binary systems have ever been observed in VHE gamma rays. Partly, this is because VHE gamma-ray binaries appear to be very rare, and part is due to observational bias. Most instruments operating at TeV are pointed and must allocate time to observing various gamma-ray sources. The High Altitude Water Cherenkov (HAWC) observatory, on the other hand, has high uptime (duty cycle >95%) and a wide field of view (2 sr), making it well-suited for observing transient and time-varying sources such as binaries. SS 433 is a known microquasar that has two jets ("east" and "west") terminating in radio lobes of a surrounding supernova remnant, W 50. The recent observation of SS 433 with HAWC marked the first direct evidence of gamma-ray emission from the jets of a microquasar. Using the HAWC data, we have measured VHE gamma-ray flux of e1 in the east lobe and w1 in the west lobe with a combined post-trial statistical significance of 5.4 sigma. Furthermore, energy differential flux upper limits have been computed at the location of the central binary and a source-stacked analysis has been performed together with three other gamma-ray microquasar candidates.