TL;DR
This paper reviews the progress in extragalactic molecular spectroscopy over the past 40 years, emphasizing the role of line surveys in understanding the chemical composition and physical conditions of molecular gas in galaxy nuclei.
Contribution
It summarizes recent advances in extragalactic molecular line surveys and discusses ongoing projects enabled by improved observational capabilities.
Findings
Line surveys reveal diverse molecular compositions in galaxy nuclei.
Advances in bandwidth have enhanced detection of multiple molecular species.
Recent surveys have improved understanding of ISM conditions in extragalactic environments.
Abstract
40 years have passed since the first molecular detection outside our Galaxy. Since then, our knowledge on the distribution, kinematics and composition of the molecular material in the extragalactic ISM has built up significantly based not only on the carbon monoxide observations but also in the more than 50 molecular species detected. In particular, line surveys have been proven to be excellent tools to study the chemical composition in the nuclei of galaxies. Such studies have been favored by the increasing instantaneous bandwidth of current mm and sub-mm facilities. Here I will summarize the highlights of extragalactic molecular spectroscopy, mostly focusing in the results from molecular line surveys published in the last few years as well as the aims of still ongoing projects.
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