12.2-GHz methanol maser MMB follow-up catalogue - I. Longitude range 330 to 10 degrees

TL;DR

This paper presents a catalogue of 12.2-GHz methanol masers detected in a specific longitude range, reporting 184 sources with nearly half being new discoveries, and discusses their properties and implications.

Contribution

First comprehensive catalogue of 12.2-GHz methanol masers in the specified longitude range, including new detections and analysis of unusual emission features.

Findings

184 12.2-GHz sources detected, 117 are new

Detection rate of 46% among targeted masers

Some sources exhibit stronger 12.2-GHz emission than 6.7-GHz

Abstract

We present a catalogue of 12.2-GHz methanol masers detected towards 6.7-GHz methanol masers observed in the unbiased Methanol Multibeam (MMB) survey in the longitude range 330\circ (through 360\circ) to 10\circ. This is the first portion of the catalogue which, when complete, will encompass all of the MMB detections. We report the detection of 184 12.2-GHz sources towards 400 6.7-GHz methanol maser targets, equating to a detection rate of 46 per cent. Of the 184 12.2-GHz detections, 117 are reported here for the first time. We draw attention to a number of 'special' sources, particularly those with emission at 12.2-GHz stronger than their 6.7-GHz counterpart and conclude that these unusual sources are not associated with a specific evolutionary stage.