The 6-GHz methanol multibeam maser catalogue IV: Galactic longitudes 186 to 330 including the Orion-Monoceros region

TL;DR

This paper reports a comprehensive survey of methanol masers in a specific Galactic longitude range, discovering new sources and providing detailed observations of the Orion-Monoceros region, advancing our understanding of star-forming regions.

Contribution

It presents the fourth segment of a large-scale methanol maser survey, including 89 new detections and detailed observations of key star-forming regions, completing the southern sky coverage.

Findings

207 maser detections reported, 89 new sources.

43% of sources are newly discovered in this survey.

New positions and spectra for Orion-A and Orion-B masers.

Abstract

We present the fourth portion of a Galactic Plane survey of methanol masers at 6668 MHz, spanning the longitude range 186 degrees to 330 degrees. We report 207 maser detections, 89 new to the survey. This completes the southern sky part of the Methanol Multibeam survey and includes a large proportion of new sources, 43%. We also include results from blind observations of the Orion-Monoceros star forming region, formally outside the latitude range of the Methanol Multibeam survey; only the four previously known methanol emitting sites were detected, of which we present new positions and spectra for masers at Orion-A (south) and Orion-B, obtained with the MERLIN array.