For the very first time, astronomers detected a quasi-periodic oscillation signal in the radio band from a Galactic black hole system.
Using FAST, the scientists discovered a quasi-periodic oscillation signal in the radio band for the first time from any microquasar systems.
Astronomers use QPOs to understand how black hole function, but they have never been observed as part of a black hole's radio emission, as opposed to its X-ray emissions."The peculiar QPO signal has a rough period of 0.2 seconds or a frequency of about 5 Hertz," Wei Wang, a professor at China’s Wuhan University who led the team behind the discovery, explained. "Such a signal does not always exist and only shows up under special physical conditions.
"In accreting black hole systems, X-rays usually probe the accretion disk around the black hole while radio emission usually probes the jet launched from the disk and the black hole," Zhang explained.
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