Journal Article

Survival of star-forming giant clumps in high-redshift galaxies

Mark R. Krumholz and Avishai Dekel

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 1, pages 112-120
Published in print July 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI:
Survival of star-forming giant clumps in high-redshift galaxies

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We investigate the effects of radiation pressure from stars on the survival of the star-forming giant clumps in high-redshift massive disc galaxies, during the most active phase of galaxy formation. The clumps, typically of mass and radius , are formed in the turbulent gas-rich discs by violent gravitational instability and then migrate into a central bulge in ∼10 dynamical times. We show that the survival or disruption of these clumps under the influence of stellar feedback depends critically on the rate at which they form stars. If they convert a few per cent of their gas mass to stars per free-fall time, as observed for all local star-forming systems and implied by the Kennicutt–Schmidt law, they cannot be disrupted. Only if clumps convert most of their mass to stars in a few free-fall times can feedback produce significant gas expulsion. We consider whether such rapid star formation is likely in high-redshift giant clumps.

Keywords: galaxies: formation; galaxies: ISM; galaxies: star clusters: general; galaxies: star formation; ISM: clouds; stars: formation

Journal Article.  7851 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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