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Resolved star formation relations at high redshift from the IRAM PHIBSS program

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Jonathan Freundlich ,
Françoise Combes ,
Linda Tacconi ,
Michael Cooper ,
Reinhard Genzel ,
Roberto Neri  and
the PHIBSS consortium
Jonathan Freundlich
Affiliation:
LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75014, Paris, France
Françoise Combes
Affiliation:
LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75014, Paris, France Collège de France, PSL Research University, F-75005, Paris, France
Linda Tacconi
Affiliation:
Max-Planck-Institut für extraterrestrische Physik (MPE), Garching, Germany
Michael Cooper
Affiliation:
Dept. of Physics & Astronomy, Frederick Reines Hall, University of California, Irvine, CA, United States
Reinhard Genzel
Affiliation:
Max-Planck-Institut für extraterrestrische Physik (MPE), Garching, Germany University of California, Berkeley, CA, United States
Roberto Neri
Affiliation:
IRAM, Grenoble, France
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Abstract

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Observed massive galaxies in the distant Universe form stars at much higher rates than today. High levels of star formation are sustained by a continuous supply of fresh gas and high molecular gas fractions. But after a peak around redshift z=2-3, the star formation rate decreases by an order of magnitude. Is this evolution mostly driven by the available cold gas reservoir, or are the star formation processes qualitatively different near the star formation peak? The Kennicutt-Schmidt relation enables to characterize the star formation efficiency at low and high redshift, but resolved measurements at the scale of the star-forming regions themselves are still challenging at high redshift. Molecular gas observations carried out at the IRAM Plateau de Bure interferometer within the PHIBSS program (Tacconi, Combes et al.) permit us to study the star formation efficiency at sub-galactic scales around z=1.2 and 1.5 for a limited sample of galaxies, and thus help characterize the star formation processes at this epoch. Our results lay in the continuation of the resolved low-redshift measurements, but further studies would be necessary to complement our sample and validate our conclusions.

Keywords

galaxies: evolutiongalaxies: high-redshiftgalaxies: structurestars: formation
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E22
Copyright
Copyright © International Astronomical Union 2016 

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