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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.author Noble, A.G.
dc.contributor.author McDonald, M.
dc.contributor.author Muzzin, A.
dc.contributor.author Nantais, J.
dc.contributor.author Rudnick, G.
dc.contributor.author Van Kampen, E.
dc.contributor.author Webb, T.M.A.
dc.contributor.author Wilson, G.
dc.contributor.author Yee, H.K.C.
dc.contributor.author Boone, K.
dc.contributor.author Cooper, M.C.
dc.contributor.author DeGroot, A.
dc.contributor.author Delahaye, A.
dc.contributor.author Demarco, R.
dc.contributor.author Foltz, R.
dc.contributor.author Hayden, B.
dc.contributor.author Lidman, C.
dc.contributor.author Manilla-Robles, A.
dc.contributor.author Perlmutter, S.
dc.date.accessioned 2017-11-24T20:05:19Z
dc.date.available 2017-11-24T20:05:19Z
dc.date.issued 2017-06
dc.identifier.citation Astrophysical Journal Letters Volume 842, Issue 2, 20 June 2017, Article number L21 es_CL
dc.identifier.issn 2041-8205
dc.identifier.other DOI: 10.3847/2041-8213/aa77f3
dc.identifier.uri http://repositorio.unab.cl/xmlui/handle/ria/4744
dc.description Indexación: Web of Science; Scopus. es_CL
dc.description.abstract We 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.uri http://iopscience.iop.org/article/10.3847/2041-8213/aa77f3/meta
dc.language.iso en es_CL
dc.publisher Institute of Physics Publishing es_CL
dc.subject Galaxies: clusters: general es_CL
dc.subject Galaxies: evolution es_CL
dc.subject Galaxies: high-redshift es_CL
dc.subject Galaxies: ISM es_CL
dc.subject Galaxies: star formation es_CL
dc.subject Infrared: galaxies es_CL
dc.title ALMA Observations of Gas-rich Galaxies in z ~ 1.6 Galaxy Clusters: Evidence for Higher Gas Fractions in High-density Environments es_CL
dc.type Article es_CL

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