Study of a bright sources sample in the RATAN-600 Western sector observations

Abstract

From June 2018 to May 2019, the 24 hours strip of the sky on the Crab nebula declination and from June 2020 to May 2021 the strip on the microquasar GRS 1915+105 declination were observed with a four-beam complex of four-channel sensitive radiometers, established in the focal line of the ”Western sector” of the RATAN-600 radio telescope. The main aim of these surveys was to search for the fast radio bursts, but in the report we discuss the traditional blind survey with a high sensitivity. We averaged the data received in narrow channels to achieve total sensitivity of about ∼ 5 mJy/beam for a total frequency band equal to 600 MHz at the frequency of 4.7 GHz. This value is only constrained by the effect of confusion for the antenna beam, having the angular sizes 1 ′ × 35 ′ . We obtained about 25 high-quality records of the 24 hour strip of the sky for every month of the observations and calculated 12 average drift scans. Here we considered a primary sample of 121 the most bright sources, detected in the both surveys. We identified these sources with the radio sources from different catalogs, collected in the CATS database. That allowed us to plot compiled radio spectra of the sources. We have analyzed spectra and light curves of all sources. Also we identified the sources with big optical and infrared catalogues, and found that sources are galaxies and quasars.