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Star Formation Efficiency at Intermediate Redshift

dc.contributor.authorCOMBES, F.
hal.structure.identifierObservatorio Astronomico Nacional, Madrid
dc.contributor.authorGARCÍA-BURILLO, S.
hal.structure.identifierFORMATION STELLAIRE 2013
dc.contributor.authorBRAINE, J.
dc.contributor.authorSCHINNERER, E.
hal.structure.identifierMax-Planck-Institut für Astronomie [MPIA]
dc.contributor.authorWALTER, F.
hal.structure.identifierDepartment of Physics
dc.contributor.authorCOLINA, L.
dc.date.issued2013-03
dc.date.conference2012
dc.identifier.issn1743-9213
dc.description.abstractEnStar formation is evolving very fast in the second half of the Universe, and it is as yet unclear whether this is due to evolving gas content, or evolving star formation efficiency (SFE). We have carried out a survey of ultra-luminous galaxies (ULIRG) between z = 0.2 and 1, to check the gas fraction in this domain of redshift which is still poorly known. Our survey with the IRAM-30m detected 33 galaxies out of 69, and we derive a significant evolution of both the gas fraction and SFE of ULIRGs over the whole period, and in particular a turning point around z = 0.35. The result is sensitive to the CO-to-H2 conversion factor adopted, and both gas fraction and SFE have comparable evolution, when we adopt the low starburst conversion factor of α = 0.8 M&sun; (K km s-1 pc2)-1. Adopting a higher α will increase the role of the gas fraction. Using α = 0.8, the SFE and the gas fraction for z˜0.2-1.0 ULIRGs are found to be significantly higher, by a factor 3, than for local ULIRGs, and are comparable to high redshift ones. We compare this evolution to the expected cosmic H2 abundance and the cosmic star formation history.
dc.language.isoen
dc.publisherCambridge University Press (CUP)
dc.source.titleProceedings of the International Astronomical Union, Volume 292, pp. 303-306, 2013
dc.subjectgalaxies: evolution
dc.subjectgalaxies: ISM
dc.subjectgalaxies: interactions
dc.subjectgalaxies: starburst
dc.subjectradio lines: galaxies
dc.title.enStar Formation Efficiency at Intermediate Redshift
dc.typeCommunication dans un congrès
dc.identifier.doi10.1017/S1743921313001488
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv1209.5523
bordeaux.journalProceedings of the International Astronomical Union
bordeaux.page303-306
bordeaux.volume292
bordeaux.countryCN
bordeaux.title.proceedingProceedings of the International Astronomical Union, Volume 292, pp. 303-306, 2013
bordeaux.conference.cityBeijing
bordeaux.peerReviewedoui
hal.identifierhal-00822653
hal.version1
hal.invitednon
hal.proceedingsoui
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00822653v1
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