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GAS FRACTION AND DEPLETION TIME OF MASSIVE STAR-FORMING GALAXIES AT z similar to 3.2: NO CHANGE IN GLOBAL STAR FORMATION PROCESS OUT TO z > 3

Schinnerer, E.; Groves, Brent Allan; Sargent, M. T.; Karim, A; Oesch, P. A.; Magnelli, B; LeFevre, O.; Tasca, L.; Civano, F.; Cassata, P.; Smolcic, Vernesa

Description

The observed evolution of the gas fraction and its associated depletion time in main-sequence (MS) galaxies provides insights on how star formation proceeds over cosmic time. We report ALMA detections of the rest-frame ∼300 μm continuum observed at 240 GHz for 45 massive (álog 10.7 ( ( )) M M  ñ = ), normal star-forming (álog sSFR yr 8.6 ( ( )) -1 ñ=- ), i.e., MS, galaxies at z » 3.2 in the COSMOS field. From an empirical calibration between cold neutral, i.e., molecular and atomic, gas mass...[Show more]

dc.contributor.authorSchinnerer, E.
dc.contributor.authorGroves, Brent Allan
dc.contributor.authorSargent, M. T.
dc.contributor.authorKarim, A
dc.contributor.authorOesch, P. A.
dc.contributor.authorMagnelli, B
dc.contributor.authorLeFevre, O.
dc.contributor.authorTasca, L.
dc.contributor.authorCivano, F.
dc.contributor.authorCassata, P.
dc.contributor.authorSmolcic, Vernesa
dc.date.accessioned2018-11-29T22:52:25Z
dc.date.available2018-11-29T22:52:25Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/152167
dc.description.abstractThe observed evolution of the gas fraction and its associated depletion time in main-sequence (MS) galaxies provides insights on how star formation proceeds over cosmic time. We report ALMA detections of the rest-frame ∼300 μm continuum observed at 240 GHz for 45 massive (álog 10.7 ( ( )) M M  ñ = ), normal star-forming (álog sSFR yr 8.6 ( ( )) -1 ñ=- ), i.e., MS, galaxies at z » 3.2 in the COSMOS field. From an empirical calibration between cold neutral, i.e., molecular and atomic, gas mass Mgas and monochromatic (rest-frame) infrared luminosity, the gas mass for this sample is derived. Combined with stellar mass M and star formation rate (SFR) estimates (from MAGPHYS fits) we obtain a median gas fraction of m = = - M M + 1.65 gas gas 0.19 0.18 and a median gas depletion time ( ) = = - + t M depl. gas SFR Gyr 0.68 ; 0.08 0.07 correction for the location on the MS will only slightly change the values. The reported uncertainties are the 1s error on the median. Our results are fully consistent with the expected flattening of the redshift evolution from the 2-SFM (2 star formation mode) framework which empirically prescribes the evolution assuming a universal, log-linear relation between SFR and gas mass coupled to the redshift evolution of the specific star formation rate (sSFR) of MS galaxies. While tdepl. shows only a mild dependence on location within the MS, a clear trend of increasing mgas across the MS is observed (as known from previous studies). Further, we comment on trends within the MS and (in)consistencies with other studies.
dc.format.mimetypeapplication/pdf
dc.publisherIOP Publishing
dc.sourceThe Astrophysical Journal
dc.titleGAS FRACTION AND DEPLETION TIME OF MASSIVE STAR-FORMING GALAXIES AT z similar to 3.2: NO CHANGE IN GLOBAL STAR FORMATION PROCESS OUT TO z > 3
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume833
dc.date.issued2016
local.identifier.absfor020109 - Space and Solar Physics
local.identifier.ariespublicationa383154xPUB5165
local.type.statusPublished Version
local.contributor.affiliationSchinnerer, E., Max Planck Institut fur Astronomie
local.contributor.affiliationGroves, Brent Allan, College of Science, ANU
local.contributor.affiliationSargent, M. T., University of Sussex
local.contributor.affiliationKarim, A, Argelander Institute for Astronomy
local.contributor.affiliationOesch, P. A., Yale University
local.contributor.affiliationMagnelli, B, Argelander Institute for Astronomy
local.contributor.affiliationLeFevre, O., Laboratoire d’Astrophysique de Marseille
local.contributor.affiliationTasca, L., Laboratoire d’Astrophysique de Marseille
local.contributor.affiliationCivano, F., Yale Center for Astronomy and Astrophysics
local.contributor.affiliationCassata, P., Universidad de Valparaiso
local.contributor.affiliationSmolcic, Vernesa, University of Zagreb
local.bibliographicCitation.issue1
local.identifier.doi10.3847/1538-4357/833/1/112
dc.date.updated2018-11-29T07:45:57Z
local.identifier.scopusID2-s2.0-85006381944
local.identifier.thomsonID000390765800008
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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