Peculiar Spectrum of the Water Maser in the Dark Nebula MSXDCG24.33+011(G24.33+014)

Abstract

Giant molecular clouds (GMC) in our and other galaxies and small dense molecular clouds inside the Galaxy (IRDC) form cores due to gravitational instability, in which massive stars and clusters of low-mass stars arise. The high background of infrared radiation inside the Galaxy creates advantages in favor of IRDCs in the study of star formation processes and accompanying phenomena such as accretion, the appearance of HII regions, bipolar outflows, and others that cause various responses in their molecular composition. As a part of studying the evolutionary state in the cloud IRDC MSXDCG24.33+011 (the alternative name is G24.33+014), observations of the water vapor maser were made. On November 28 (2022) during the observations using the RT-22 of the Pushchino Radio Astronomy Observatory, the H2O maser detail at the velocity of \({{V}_{{{\text{LSR}}}}} = 103.15\) km/s with the linewidth of 0.52 km/s was detected. Peak flux of 49.5(\( \pm 6\)) Jy was recorded. This detail was not detected on RT-22 in the PRAO on July 5 (2022) and has not been seen before by other researchers.