Open AccessLong-term multi-frequency studies of flaring activity from microquasars
Author(s) -
С. А. Трушкин,
А. В. Шевченко,
Н. Н. Бурсов,
П. Г. Цыбулев,
N. A. Nizhelsky
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.196
Subject(s) - physics , astrophysics , neutron star , fermi gamma ray space telescope , black hole (networking) , radiation , astronomy , optics , computer network , routing protocol , routing (electronic design automation) , computer science , link state routing protocol
The long-term monitoring at RATAN-600 of studies of bright X-ray binary stars in various ranges of the electromagneticspectrum, a search and detailed study of correlations between variable X-ray, radio and gamma radiation was carried out.It is a key point for understanding the formation of jet emissions from accreting matter onto a black hole (or neutron star).From April 2019 For a year, we began to use the multi-azimuth measurement mode on the Southern Sector antenna systemwith a at reector, when 31 measurements of ux densities at frequencies 4.7, 8.6, 15 and 30 GHz of several giant CygnusX-3 ares, SS433 [1] and GRS1915+105 bright ashes were carried out for 5–6 hours around the culmination of the source.In January 2020, Cyg X-3 switched to a hyper-soft X-ray state, the exit from which in early February led to the brightest theradio ash for the all history of its observations. The Cygnus X-3 ow density increased from 5 mJy to 20 Jy at a frequencyof 4.7 GHz and up to 22 Jy at 2.3 GHz in 2–3 days. In multi-azimuthal observations in the beginning phase, we registered alinear law of increase in the ux at times from 1 to 5 hours. Comparing the data of the space Gamma-ray telescopes (Swift,AGILE and Fermi) and the MAXI and NICER X-ray monitors on board the ISS, we found that aring events from the radioto the Gamma-rays are interrelated, which is a reection of the causal relationship of physical processes in the accretiondisk and in jet emissions. The spectral and time dependence of the evolution of ares allow us to model the synchrotronradiation of microquasars based on changes in the volume of jet emissions, the strength of their magnetic eld and the modeof generation and absorption of radio radiation from relativistic electrons. Radio ares of the microquasar GRS1915+105,as a clear manifestation of a new jet activity, always have the character of a reaction to changes in the conditions forgenerating X-rays in the accretion disk (MAXI) and in the corona (Swift). We have studied in details periodic radio aresfrom the X-ray binary with bright Gamma-ray radiation LSI+61d303 for more than 60 orbital periods. Undoubtedly, thenature of these ares changes dramatically depending on the known super-orbital 4.6-year period.