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Short-lived star-forming giant clumps in cosmological simulations of z~2 disks | | Shy Genel
; Thorsten Naab
; Reinhard Genzel
; Natascha M. Förster Schreiber
; Amiel Sternberg
; Ludwig Oser
; Peter H. Johansson
; Romeel Davé
; Benjamin D. Oppenheimer
; Andreas Burkert
; | | Date: |
1 Nov 2010 | | Abstract: | Many observed massive star-forming z~2 galaxies are large disks that exhibit
irregular morphologies, with ~1kpc, ~10^(8-10)Msun clumps. We present
high-resolution cosmological SPH simulations that zoom-in on the formation of
individual M*~10^(10.5)Msun galaxies in ~10^(12)Msun halos at z~2 . Our code
includes strong stellar feedback parameterized as momentum-driven galactic
winds. This model reproduces many characteristic features of this observed
class of galaxies, such as their clumpy morphologies, high gas fractions (~30%)
and high specific star-formation rates, ~1Gyr^(-1). In accord with recent
models, giant clumps (Mclump>~5x10^8Msun) form in-situ via gravitational
instability. However, the galactic winds are critical for their subsequent
evolution. In the cases we have studied, the clumps are short-lived and are
disrupted by wind-driven mass loss. They do not virialise or migrate to the
galaxy centers as suggested in recent work neglecting strong winds. Our
simulations agree well with new observational constraints on clump kinematics
and with the detection of winds from high-redshift galaxies and in particular
from individual clumps. | | Source: | arXiv, 1011.0433 | | Services: | Forum | Review | PDF | Favorites | |
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