MALT-45: A 7mm survey of the southern Galaxy - II. ATCA follow-up observations of 44GHz class I methanol masers
Christopher H. Jordan, Andrew J. Walsh, Shari L. Breen, Simon P., Ellingsen, Maxim A. Voronkov, Lucas J. Hyland

TL;DR
This study uses ATCA follow-up observations to analyze 44GHz class I methanol masers detected in the Galactic plane, revealing their spatial, velocity, and evolutionary properties in star-forming regions.
Contribution
It provides high-resolution positions and comparisons with other maser species, identifying quasi-thermal emission and characterizing the physical environments of class I methanol masers.
Findings
Most masers have small spatial and velocity ranges.
Masers are associated with clumps of 1000-3000 solar masses.
Evolutionary stage correlates with presence of OH masers and radio lines.
Abstract
We detail interferometric observations of 44GHz class I methanol masers detected by MALT-45 (a 7mm unbiased auto-correlated spectral-line Galactic-plane survey) using the Australia Telescope Compact Array. We detect 238 maser spots across 77 maser sites. Using high-resolution positions, we compare the class I CHOH masers to other star formation maser species, including CS (1-0), SiO and the H53 radio-recombination line. Comparison between the cross- and auto-correlated data has allowed us to also identify quasi-thermal emission in the 44GHz class I methanol maser line. We find that the majority of class I methanol masers have small spatial and velocity ranges (0.5pc and 5 km s), and closely trace the systemic velocities of associated clouds. Using 870m dust continuum emission from the ATLASGAL survey, we determine clump masses associated with class I…
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