The Three-mm Ultimate Mopra Milky Way Survey. I. Survey Overview, Initial Data Releases, and First Results
Peter J. Barnes, Erik Muller, Balthasar Indermuehle, Stefan N., O'Dougherty, Vicki Lowe, Maria R. Cunningham, Audra K. Hernandez, and Gary A., Fuller

TL;DR
ThrUMMS is a new mm-wave survey mapping a large part of the Milky Way's fourth quadrant, providing high-resolution data on molecular lines, revealing diverse physical conditions and suggesting previous underestimations of molecular mass in the Galactic disk.
Contribution
It introduces innovative observing techniques with Mopra, delivers the first data releases, and presents a new nonlinear conversion law for molecular mass estimation from CO data.
Findings
Wide variation in CO line ratios indicating diverse physical conditions.
Cold clouds exhibit very high optical depths, exceeding 100.
Revised conversion law suggests previous molecular mass estimates may be underestimated.
Abstract
We describe a new mm-wave molecular-line mapping survey of the southern Galactic Plane and its first data releases. The Three-mm Ultimate Mopra Milky Way Survey (ThrUMMS) maps a 60{\deg}x2{\deg} sector of our Galaxy's fourth quadrant, using a combination of fast mapping techniques with the Mopra radio telescope, simultaneously in the J=1-0 lines of CO, CO, CO, and CN near 112 GHz at ~arcminute and ~0.3 km s resolution, with ~2 K channel sensitivity for CO and ~1 K channel for the other transitions. The calibrated data cubes from these observations are made available to the community after processing through our pipeline. Here, we describe the motivation for ThrUMMS, the development of new observing techniques for Mopra, and how these techniques were optimised to the objectives of the survey. We showcase some sample data products and…
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