THE LONG LIVES OF GIANT CLUMPS AND THE BIRTH OF OUTFLOWS IN GAS-RICH GALAXIES AT HIGH REDSHIFT

We present 3.5-7 pc resolution adaptive mesh refinement simulations of high-redshift disks including photoionization, radiation pressure, and supernovae feedback. Our modeling of radiation pressure determines the mass loading and initial velocity of winds from basic physical principles. We find that...

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Bibliographic Details
Published in:The Astrophysical journal 2014-01, Vol.780 (1), p.1-18
Main Authors: BOURNAUD, FREDERIC, Perret, Valentin, Renaud, Florent, Dekel, Avishai, Elmegreen, Bruce G, Elmegreen, Debra M, Teyssier, Romain, Amram, Philippe, Daddi, Emanuele, Duc, Pierre-Alain
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BLACK HOLES
Clumps
COMPARATIVE EVALUATIONS
DENSITY
DISPERSIONS
EVOLUTION
Feedback
GALAXIES
INSTABILITY
LOSSES
MASS
Outflow
PHOTOIONIZATION
RADIATION PRESSURE
RED SHIFT
RESOLUTION
SIMULATION
SPHEROIDS
STRIPPING
SUPERNOVAE
VELOCITY
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Summary:We present 3.5-7 pc resolution adaptive mesh refinement simulations of high-redshift disks including photoionization, radiation pressure, and supernovae feedback. Our modeling of radiation pressure determines the mass loading and initial velocity of winds from basic physical principles. We find that the giant clumps produce steady outflow rates comparable to and sometimes somewhat larger than their star formation rate, with velocities largely sufficient to escape the galaxy. The clumps also lose mass, especially old stars, by tidal stripping, and the stellar populations contained in the clumps hence remain relatively young ([< or =]200 Myr), as observed. The outflow and accretion rates have specific timescales of a few 10 sub(8) yr, as opposed to rapid and repeated dispersion and reformation of clumps. Our simulations produce gaseous outflows with velocities, densities, and mass loading consistent with observations, and at the same time suggest that the giant clumps survive for hundreds of Myr and complete their migration to the center of high-redshift galaxies.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/780/1/57