A turnover in the galaxy main sequence of star formation at M*∼ 10¹⁰ M☉ for redshifts z< 1.3

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dc.contributor.authorLee, Nicholas
dc.contributor.authorSanders, D. B.
dc.contributor.authorCasey, Caitlin M.
dc.contributor.authorToft, Sune
dc.contributor.authorScoville, N. Z.
dc.contributor.authorHung, Chao-Ling
dc.contributor.authorLe Floc'h, Emeric
dc.contributor.authorIlbert, Olivier
dc.contributor.authorZahid, H. Jabran
dc.contributor.authorAussel, Hervé
dc.contributor.authorCapak, Peter
dc.contributor.authorKartaltepe, Jeyhan S.
dc.contributor.authorKewley, Lisa
dc.contributor.authorLi, Yanxia
dc.contributor.authorSchawinski, Kevin
dc.contributor.authorSheth, Kartik
dc.contributor.authorXiao, Quanbao
dc.date.accessioned2015-04-27T01:36:07Z
dc.date.available2015-04-27T01:36:07Z
dc.date.issued2015-03-05
dc.date.updated2015-12-10T10:21:35Z
dc.description.abstractThe relationship between galaxy star formation rates (SFRs) and stellar masses (M∗) is reexamined using a mass-selected sample of ∼62,000 star-forming galaxies at z 1.3 in the COSMOS 2 deg²field. Using new far-infrared photometry from Herschel-PACS and SPIRE and Spitzer-MIPS 24μm, along with derived infrared luminosities from the NRK method based on galaxies’ locations in the restframe color–color diagram (NUV − r) versus (r − K), we are able to more accurately determine total SFRs for our complete sample. At all redshifts, the relationship between median SFR and M∗ follows a power law at low stellar masses, and flattens to nearly constant SFR at high stellar masses. We describe a new parameterization that provides the best fit to the main sequence and characterizes the low mass power-law slope, turnover mass, and overall scaling. The turnover in the main sequence occurs at a characteristic mass of about M0 ∼ 10¹⁰ Mʘ at all redshifts. The low mass power-law slope ranges from 0.9–1.3 and the overall scaling rises in SFR as a function of (1 +z)⁴˙¹²±⁰˙¹⁰. A broken power-law fit below and above the turnover mass gives relationships of SFR ∝ M⁰˙⁸⁸±⁰˙⁰⁶ ∗ below the turnover mass and SFR ∝ M⁰˙²⁷±⁰˙⁰⁴ ∗ above the turnover mass. Galaxies more massive than M∗ 1010 M have a much lower average specific star formation rate (sSFR) than would be expected by simply extrapolating the traditional linear fit to the main sequence found for less massive galaxies.
dc.identifier.issn1538-4357en_AU
dc.identifier.urihttp://hdl.handle.net/1885/13322
dc.publisherIOP Publishing
dc.rightshttp://www.sherpa.ac.uk/romeo/issn/0004-637X/..."Publisher's version/PDF may be used. On any website or open access repository" from SHERPA/RoMEO site (as at 27/04/15)
dc.sourceThe Astrophysical Journal
dc.subjectgalaxies: evolution
dc.subjectgalaxies: high-redshift
dc.subjectgalaxies: star formation
dc.titleA turnover in the galaxy main sequence of star formation at M*∼ 10¹⁰ M☉ for redshifts z< 1.3
dc.typeJournal article
local.bibliographicCitation.issue2en_AU
local.bibliographicCitation.startpage80en_AU
local.contributor.affiliationKewley, L. J., Research School of Astrophysics, Australian National Universityen_AU
local.contributor.authoremaillisa.kewley@anu.edu.auen_AU
local.contributor.authoruidU9415124en_AU
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationa383154xPUB1248
local.identifier.citationvolume801en_AU
local.identifier.doi10.1088/0004-637X/801/2/80en_AU
local.identifier.scopusID2-s2.0-84924746871
local.identifier.uidSubmittedByu1005913en_AU
local.type.statusPublished Versionen_AU

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