Shulou(Shulou.com)11/24 Report--

CTOnews.com, July 27, Nature (Nature) magazine today published on its website the latest research results of the Wuhan University team on black holes. The paper is entitled "Sub-second periodic radio oscillations in a microquasar (subsecond periodic radio oscillations in microquasars)", led by Professor Wang Wei, Department of Astronomy, School of physical Science and Technology, Wuhan University.

▲ image source Nature it is reported that a microquasar is a binary star system composed of a neutron star or a black hole and an ordinary star in the Milky way. Neutron stars or black holes accumulate matter from stars to produce high-temperature accretion disks and relativistic jets, which show intermittent or long-term changes in X-ray and radio radiation in observation, and are the natural cosmic laboratory for the study of strong gravitational field and relativistic physics.

At the same time, CTOnews.com learned that GRS 1915: 105 is a famous microquasar, which contains a rapidly rotating black hole from which the superluminal radio jet can be observed, so the star is an important sample for the study of extreme high energy physical processes.

In order to reveal the relativistic jets of microquasars, the research team of Wuhan University used "Chinese Sky Eye" (500m aperture spherical radio telescope FAST) to monitor the radio continuous spectrum light variation of the black hole with high time precision for the first time from 2020 to 2022, and the sampling time was as high as 49 microseconds.

▲ Image Source FAST Telescope website relies on the high sampling rate and detection sensitivity of the FAST telescope, the research team found a weak radio pulse in the black hole in January 2021 and June 2022, with a pulse period of about 0.2 seconds.

This result is the first observation of sub-second low-frequency radio quasi-periodic oscillation of microquasars in the world, and is expected to open up new ideas for radio observation and theoretical research of black holes.

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