Survey of Regions with Methanol Masers in the CS (J = 2–1) Line: Statistical Characteristics of Radiation

Abstract

The paper aims at establishing relations between the parameters of methanol maser emission that originates in dense star-forming regions and parameters of a dense core using emission of the CS molecule. A total of 164 sources toward the positions of methanol masers using the RT-22 radio telescope at CrAO, Ukraine, have been observed. For 85 sources, the CS (J = 2–1) line emission was detected. Most of the sources have been selected from catalogs of the class I and class II methanol masers. For methanol masers, this is the most complete survey in the CS (J = 2–1) line on the northern sky. A comparative analysis of parameters of methanol masers spectra in the CS (J = 2–1) line, and methanol masers, luminosities of dense cores, and infrared sources, has been performed. The detection rates of the CS (J = 2–1) line emission, its intensities and widths, the differences between the systematic velocities and velocities of the maser line centers have been investigated. The radiation detection rates in the CS (J = 2–1) line are shown to differ for various source samplings. The form of the dependences lgL_cs – lgL_bol, lgL_mas – lgL_cs and lgL_mas – lgL_bol has been found for sources with which methanol masers are associated. Based on the luminosity of infrared sources, samples of sources in which the CS (J = 2–1) line emission is detected with a higher probability have been determined.