Title : Gamma Rays + Binaries = Gamma-Ray Binaries 

일시 : 2023년 12월 12일(화), 17시

Speaker : 노창동 (성균관대)

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 are 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 many kinds of objects. 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.

In this talk, we present the most up-to-date results on three distinct gamma-ray binary systems, namely, SS 433, LS 5039, and V4641 Sgr, produced using 1910 days of HAWC data.