A titanic interstellar medium ejection from a massive starburst galaxy at redshift 1.4

Abstract

Feedback-driven winds from star formation or active galactic nuclei might be a relevant channel for the abrupt quenching star formation in massive galaxies. However, both observations and simulations support the idea that these processes are non-conflictingly co-evolving and self-regulating. Furthermore, evidence of disruptive events that are capable of fast quenching is rare, and constraints on their statistical prevalence are lacking. Here we present a massive starburst galaxy at z=1.4 which is ejecting $46\pm 13$\% of its molecular gas mass at a startling rate of $\gtrsim 10,000$ M${}_{\odot }{\mathrm{yr}}^{-1}$. A broad component that is red-shifted from the galaxy emission is detected in four (low- and high-J) CO and [CI] transitions and in the ionized phase, which ensures a robust estimate of the expelled gas mass. The implied statistics suggest that similar events are potentially a major star-formation quenching channel. However, our observations provide compelling evidence that this is not a feedback-driven wind, but rather material from a merger that has been probably tidally ejected. This finding challenges some literature studies in which the role of feedback-driven winds might be overstated.

Published in Nature Astronomy as an Article on 11 January 2021. The published version is available at https://www.nature.com/articles/s41550-020-01268-x (DOI 10.1038/s41550-020-01268-x)

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