12.2-GHz methanol maser MMB follow-up catalogue - II. Longitude range 186 to 330 degrees

TL;DR

This paper presents a catalogue of 12.2-GHz methanol masers detected in a specific galactic longitude range, including new detections, source properties, and potential candidates for other methanol maser transitions.

Contribution

It provides the second part of a comprehensive catalogue of methanol masers, including new detections and analysis of source characteristics in a specific longitude range.

Findings

Detected 83 methanol masers, 39 of which are new.

Detection rate of 40% for 12.2-GHz masers.

Identified 45 candidates for 107.0-GHz methanol masers.

Abstract

We present the second portion of a catalogue of 12.2-GHz methanol masers detected towards 6.7-GHz methanol masers observed in the unbiased Methanol Multibeam (MMB) Survey. Using the Parkes radio telescope we have targeted all 207 6.7-GHz methanol masers in the longitude range 186 to 330 degrees for 12.2-GHz counterparts. We report the detection of 83 12.2-GHz methanol masers, and one additional source which we suspect is thermal emission, equating to a detection rate of 40 per cent. Of the 83 maser detections, 39 are reported here for the first time. We discuss source properties, including variability and highlight a number of unusual sources. We present a list of 45 candidates that are likely to harbor methanol masers in the 107.0-GHz transition.