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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693817.0, MPI für Astronomie / Publikationen_mpia
Star formation efficiency at intermediate redshift
Authors:Combes, F.; Garcia-Burillo, S.; Braine, J.; Schinnerer, E.; Walter, F.; Colina, L.
Publisher:Cambridge Univ. Press
Date of Publication (YYYY-MM-DD):2013
Title of Proceedings:Molecular Gas, Dust, and Star Formation in Galaxies
Start Page:303
End Page:306
Volume (in Series):292
Name of Conference/Meeting:Molecular Gas, Dust, and Star Formation in Galaxies
Place of Conference/Meeting:Beijing, China
Audience:Not Specified
Abstract / Description:Star formation is evolving very fast in the second half of the Universe, and it is 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 \alpha =0.8 Mo/(K km/s pc^2). Adopting a higher \alpha will increase the role of the gas fraction. Using \alpha =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.
Free Keywords:Astrophysics - Cosmology and Extragalactic Astrophysics
Comment of the Author/Creator:Date: 2013, September 1, 2012
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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