The Mopra Southern Galactic Plane CO Survey
Michael Burton, Catherine Braiding, Christian Glueck, Paul Goldsmith,, Jarryd Hawkes, David Hollenbach, Craig Kulesa, Chris Martin, Jorge Pineda,, Gavin Rowell, Robert Simon, Tony Stark, Juergen Stutzki, Nick Tothill, James, Urquhart, Chris Walker, Andrew Walsh, Mark Wolfire

TL;DR
This paper introduces initial results from a new CO survey of the southern Galactic plane using the Mopra telescope, providing detailed molecular gas data to understand cloud formation and the missing gas problem.
Contribution
It presents the first data release from the Mopra CO survey, including methodology, performance metrics, and initial findings on molecular gas properties in the surveyed region.
Findings
Approximately 2 million solar masses of molecular gas detected
Derived molecular cloud properties such as line ratios and optical depths
Quantified molecular gas distribution and density near the Solar circle
Abstract
We present the first results from a new carbon monoxide (CO) survey of the southern Galactic plane being conducted with the Mopra radio telescope in Australia. The 12CO, 13CO and C18O J=1-0 lines are being mapped over the l = 305-345 deg, b = +/- 0.5 deg portion of the 4th quadrant of the Galaxy, at 35" spatial and 0.1 km/s spectral resolution. The survey is being undertaken with two principal science objectives: (i) to determine where and how molecular clouds are forming in the Galaxy and (ii) to probe the connection between molecular clouds and the "missing" gas inferred from gamma-ray observations. We describe the motivation for the survey, the instrumentation and observing techniques being applied, and the data reduction and analysis methodology. In this paper we present the data from the first degree surveyed, l = 323-324 deg, b = +/- 0.5 deg. We compare the data to the previous CO…
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