tokens: We are grateful to the referee, Prof. Takeuchi, for his helpful comments. We thank Bade Uzgil for insightful discussions. Support for R.D. was provided by the DFG priority program 1573 “The physics of the interstellar medium.” F.W., B.P.V., and E.P.F. acknowledge support through ERC grant Cosmic_Dawn. D.R. acknowledges support from the National Science Foundation under grant number AST-1614213 to Cornell University. Facility: ALMA data: 2015.1.01115.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.
ner_tags: O O O O O O B-Person I-Person O O O O O O B-Person I-Person O O O O O B-Person O O O O B-Organization B-Location I-Location I-Location I-Location I-Location I-Location I-Location I-Location I-Location B-Person B-Person O B-Person O O O B-Organization O B-Grant B-Person O O O O B-Organization I-Organization I-Organization O O O B-Grant O B-Organization I-Organization O B-Observatory O B-Identifier B-Observatory O O O O B-Observatory O O O O B-Organization B-Location O B-Organization B-Location O O B-Organization B-Location B-Organization O B-Organization B-Location O B-Organization B-Location I-Location I-Location O O O O B-Location I-Location I-Location O B-Observatory I-Observatory I-Observatory O O O B-Observatory B-Organization O B-Observatory