Study of RCR Catalogue Radio Source Integral Spectra

TL;DR

This study refines the parameters of the RCR catalog sources in a specific right-ascension interval, analyzes their spectra using new low-frequency data, and explores the relationship between spectral indices and flux density.

Contribution

The paper provides an updated catalog of radio sources with refined parameters and new spectral data in the 70--230 MHz range, enhancing understanding of their spectral properties.

Findings

Spectral indices become steeper with increasing flux density at 150 MHz.

Flat spectrum sources tend to be weaker than steep spectrum sources.

Extended components influence the spectral index and flux density relationship.

Abstract

We present the characteristics of the sources found on the averaged scans of the "Cold" experiment 1980--1999 surveys in the right-ascension interval $2^h$< RA <$7^h$. Thereby, a refinement of the parameters of the RC catalog sources (RATAN Cold) for this interval is complete. To date, the RCR catalog (RATAN Cold Refined) covers the right-ascension interval $2^h$< RA <$17^h$ and includes 830 sources. The spectra are built for them with the use of new data in the range of 70--230 MHz. The dependence between the spectral indices $\alpha_{0.5}$, $\alpha_{3.94}$ and integral flux density at the frequencies of 74 and 150 MHz, at 1.4, 3.94 and 4.85 GHz is discussed. We found that at 150 MHz in most sources the spectral index $\alpha_{0.5}$ gets steeper with increasing flux density. In general, the sources with flat spectra are weaker in terms of flux density than the sources with steep spectra, which especially differs at 150 MHz. We believe that this is due to the brightness of their extended components, which can be determined by the type of accretion and the neighborhood of the source.