Universität zu Köln

Castillo, Marta Frias, Rybak, Matus, Hodge, Jacqueline, van der Werf, Paul, Riechers, Dominik A., Vieira, Daniel, Rivera, Gabriela Calistro, Martinez-Ramirez, Laura N., Walter, Fabian ORCID: 0000-0003-4793-7880, de Blok, Erwin, Narayanan, Desika and Wagg, Jeff (2022). Kiloparsec-scale Imaging of the CO(1-0)-traced Cold Molecular Gas Reservoir in a z similar to 3.4 Submillimeter Galaxy. Astrophys. J., 930 (1). BRISTOL: IOP Publishing Ltd. ISSN 1538-4357

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Abstract

We present a high-resolution study of the cold molecular gas as traced by CO(1-0) in the unlensed z similar to 3.4 submillimeter galaxy SMM J13120+4242, using multiconfiguration observations with the Karl G. Jansky Very Large Array (JVLA). The gas reservoir, imaged on 0 ''.39 (similar to 3 kpc) scales, is resolved into two components separated by similar to 11 kpc with a total extent of 16 +/- 3 kpc. Despite the large spatial extent of the reservoir, the observations show a CO(1-0) FWHM linewidth of only 267 +/- 64 km s(-1). We derive a revised line luminosity of LCO(1-0)' = (10 +/- 3) x 10(10) K km s(-1) pc(2) and a molecular gas mass of M-gas = (13 +/- 3)x 10(10) (alpha(CO)/1) M-circle dot. Despite the presence of a velocity gradient (consistent with previous resolved CO(6-5) imaging), the CO(1-0) imaging shows evidence for significant turbulent motions that are preventing the gas from fully settling into a disk. The system likely represents a merger in an advanced stage. Although the dynamical mass is highly uncertain, we use it to place an upper limit on the CO-to-H-2 mass conversion factor a alpha(CO) of 1.4. We revisit the SED fitting, finding that this galaxy lies on the very massive end of the main sequence at z = 3.4. Based on the low gas fraction, short gas depletion time, and evidence for a central AGN, we propose that SMM J13120 is in a rapid transitional phase between a merger-driven starburst and an unobscured quasar. The case of SMM J13120 highlights how mergers may drive important physical changes in galaxies without pushing them off the main sequence.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Castillo, Marta Frias UNSPECIFIED UNSPECIFIED UNSPECIFIED Rybak, Matus UNSPECIFIED UNSPECIFIED UNSPECIFIED Hodge, Jacqueline UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Werf, Paul UNSPECIFIED UNSPECIFIED UNSPECIFIED Riechers, Dominik A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vieira, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Rivera, Gabriela Calistro UNSPECIFIED UNSPECIFIED UNSPECIFIED Martinez-Ramirez, Laura N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walter, Fabian UNSPECIFIED orcid.org/0000-0003-4793-7880 UNSPECIFIED de Blok, Erwin UNSPECIFIED UNSPECIFIED UNSPECIFIED Narayanan, Desika UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagg, Jeff UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-695246
DOI:	10.3847/1538-4357/ac6105
Journal or Publication Title:	Astrophys. J.
Volume:	930
Number:	1
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMING GALAXIES; ALMA SPECTROSCOPIC SURVEY; FAR-INFRARED PROPERTIES; DEEP FIELD SOUTH; HIGH-REDSHIFT; MAIN-SEQUENCE; INTERSTELLAR-MEDIUM; STARBURST GALAXY; MAJOR MERGERS; DUST Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69524