HAWC observations of microquasars as powerful particle accelerators

Microquasars are one of the classes of powerful Galactic particle accelerators that emit gamma rays beyond multi-TeV energies. Recently, gamma-ray emission above tens of TeV has been detected from some of these objects. The High Altitude Water Cherenkov (HAWC) observatory has previously reported gamma-ray emission with a median energy of 25 TeV from the microquasar SS 433, suggesting that gamma-ray binaries can accelerate particles to above 100 TeV inside the jets. With 2,321 days of data and better reconstruction algorithms, the HAWC observatory detected emissions above 20 TeV from two other binaries, V4641 Sagittarii and LS 5039. The V4641 Sgr is detected with a significance great than 9 sigma. It’s a low-mass X-ray binary(LMXB) that has been observed with a small-scale jet-like structure in the radio wavelength. In this talk, I will present the preliminary results from V4641 Sgr and discuss possible scenarios for gamma-ray production. We will also present future plans to search for additional X-ray binaries with HAWC.