TL;DR
This paper reviews recent advances in the study of submillimeter and millimeter masers, highlighting observational challenges, technological progress with new arrays, and future research prospects across various astrophysical environments.
Contribution
It provides a comprehensive overview of recent observational work and discusses future opportunities enabled by new high-resolution submillimeter/millimeter arrays.
Findings
Detection of extragalactic water millimeter masers
Observation of hydrogen recombination masers
Identification of submillimeter masers in star-forming regions
Abstract
Despite theoretical predictions of the existence of many submillimeter masers, and some pioneering observational discoveries over the past few decades, these lines have remained relatively unstudied due to (i) challenges associated with observing at shorter wavelength; and, (ii) lack of possibility of high (< 14'' at 345 GHz) angular resolution observations. With the advent of the SMA, the first submillimeter imaging array capable of sub-arcsecond resolution, APEX, and the promise of ALMA, opportunities are opening for performing new science with millimeter/submillmeter masers. In this talk, I will review recent work in the field - including extragalactic water millimeter masers, hydrogen recombination masers, submillimeter masers in star-forming regions, and in the envelopes of evolved stars - and discuss prospects for the future.
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