TL;DR
This paper reviews how carbon monoxide (CO) is used to measure molecular gas masses in galaxies, highlighting recent developments and fundamental concepts in the field.
Contribution
It provides an overview of the basic principles and recent advancements in using CO as a tracer for molecular gas in galaxy evolution studies.
Findings
CO is a key tracer for molecular gas in galaxies.
Recent work has improved understanding of CO-to-H2 conversion factors.
Fundamental concepts underpin the use of CO in measuring gas masses.
Abstract
With an increased appreciation for the role of gas in galaxy evolution, there is renewed interest in measuring gas masses for galaxies. I review some of the basic concepts in using CO to determine molecular masses, and discuss some of the recent work.
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