ALMA Observations of Gas-rich Galaxies in z ~ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments

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dc.contributor.authorNoble, A.G.
dc.contributor.authorMcDonald, M.
dc.contributor.authorMuzzin, A.
dc.contributor.authorNantais, J.
dc.contributor.authorRudnick, G.
dc.contributor.authorVan Kampen, E.
dc.contributor.authorWebb, T.M.A.
dc.contributor.authorWilson, G.
dc.contributor.authorYee, H.K.C.
dc.contributor.authorBoone, K.
dc.contributor.authorCooper, M.C.
dc.contributor.authorDeGroot, A.
dc.contributor.authorDelahaye, A.
dc.contributor.authorDemarco, R.
dc.contributor.authorFoltz, R.
dc.contributor.authorHayden, B.
dc.contributor.authorLidman, C.
dc.contributor.authorManilla-Robles, A.
dc.contributor.authorPerlmutter, S.
dc.date.accessioned2017-11-24T20:05:19Z
dc.date.available2017-11-24T20:05:19Z
dc.date.issued2017-06
dc.descriptionIndexación: Web of Science; Scopus.es_CL
dc.description.abstractWe present ALMA CO (2-1) detections in 11 gas-rich cluster galaxies at z ∼ 1.6, constituting the largest sample of molecular gas measurements in z > 1.5 clusters to date. The observations span three galaxy clusters, derived from the Spitzer Adaptation of the Red-sequence Cluster Survey. We augment the >5σ detections of the CO (2-1) fluxes with multi-band photometry, yielding stellar masses and infrared-derived star formation rates, to place some of the first constraints on molecular gas properties in z ∼ 1.6 cluster environments. We measure sizable gas reservoirs of 0.5-2 × 1011 M in these objects, with high gas fractions (f gas) and long depletion timescales (τ), averaging 62% and 1.4 Gyr, respectively. We compare our cluster galaxies to the scaling relations of the coeval field, in the context of how gas fractions and depletion timescales vary with respect to the star-forming main sequence. We find that our cluster galaxies lie systematically off the field scaling relations at z = 1.6 toward enhanced gas fractions, at a level of ∼4σ, but have consistent depletion timescales. Exploiting CO detections in lower-redshift clusters from the literature, we investigate the evolution of the gas fraction in cluster galaxies, finding it to mimic the strong rise with redshift in the field. We emphasize the utility of detecting abundant gas-rich galaxies in high-redshift clusters, deeming them as crucial laboratories for future statistical studies.es_CL
dc.description.urihttp://iopscience.iop.org/article/10.3847/2041-8213/aa77f3/meta
dc.identifier.citationAstrophysical Journal Letters Volume 842, Issue 2, 20 June 2017, Article number L21es_CL
dc.identifier.issn2041-8205
dc.identifier.otherDOI: 10.3847/2041-8213/aa77f3
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/4744
dc.language.isoenes_CL
dc.publisherInstitute of Physics Publishinges_CL
dc.subjectGalaxies: clusters: generales_CL
dc.subjectGalaxies: evolutiones_CL
dc.subjectGalaxies: high-redshiftes_CL
dc.subjectGalaxies: ISMes_CL
dc.subjectGalaxies: star formationes_CL
dc.subjectInfrared: galaxieses_CL
dc.titleALMA Observations of Gas-rich Galaxies in z ~ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environmentses_CL
dc.typeArtículoes_CL
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