Kiloparsec-scale Imaging of the CO(1-0)-traced Cold Molecular Gas Reservoir in a <i>z</i> ∼ 3.4 Submillimeter Galaxy

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dc.contributor.authorCastillo, Marta Frias
dc.contributor.authorRybak, Matus
dc.contributor.authorHodge, Jacqueline
dc.contributor.authorvan der Werf, Paul
dc.contributor.authorRiechers, Dominik A.
dc.contributor.authorVieira, Daniel
dc.contributor.authorRivera, Gabriela Calistro
dc.contributor.authorMartinez-Ramirez, Laura N.
dc.contributor.authorWalter, Fabian
dc.contributor.authorde Blok, Erwin
dc.contributor.authorNarayanan, Desika
dc.contributor.authorWagg, Jeff
dc.date.accessioned2025-01-20T21:08:33Z
dc.date.available2025-01-20T21:08:33Z
dc.date.issued2022
dc.description.abstractWe 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.
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/ac6105
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ac6105
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93479
dc.identifier.wosidWOS:000789660000001
dc.issue.numero1
dc.language.isoen
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.titleKiloparsec-scale Imaging of the CO(1-0)-traced Cold Molecular Gas Reservoir in a <i>z</i> ∼ 3.4 Submillimeter Galaxy
dc.typeartículo
dc.volumen930
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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