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 S Dave, Benjamin D. Oppenheimer, Andreas Burkert

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

Many observed massive star-forming z ≈ 2 galaxies are large disks that exhibit irregular morphologies, with ≈1 kpc, ≈108-10 10M clumps. We present the largest sample to date of high-resolution cosmological smoothed particle hydrodynamics simulations that zoom-in on the formation of individual M *≈ 10 10.5M galaxies in ≈1012M 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, smooth and monotonic velocity gradients, high gas fractions (f g ≈ 50%), and high specific star formation rates (≳1 Gyr -1). In accord with recent models, giant clumps (M clump ≈ (5 × 108-109)M) form in situ via gravitational instabilities. However, the galactic winds are critical for their subsequent evolution. The giant clumps we obtain are short-lived and are disrupted by wind-driven mass loss. They do not virialize or migrate to the galaxy centers as suggested in recent work neglecting strong winds. By phenomenologically implementing the winds that are observed from high-redshift galaxies and in particular from individual clumps, our simulations reproduce well new observational constraints on clump kinematics and clump ages. In particular, the observation that older clumps appear closer to their galaxy centers is reproduced in our simulations, as a result of inside-out formation of the disks rather than inward clump migration.

Original languageEnglish (US)
Article number11
JournalAstrophysical Journal
Volume745
Issue number1
DOIs
StatePublished - Jan 20 2012

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clumps
stars
galaxies
simulation
galactic winds
momentum
kinematics
hydrodynamics
gravitational instability
star formation rate
massive stars
gas
halos
gradients
high resolution
gases

Keywords

  • galaxies: evolution
  • galaxies: formation
  • galaxies: high-redshift
  • galaxies: structure

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Genel, S., Naab, T., Genzel, R., Förster Schreiber, N. M., Sternberg, A., Oser, L., ... Burkert, A. (2012). Short-lived star-forming giant clumps in cosmological simulations of z ≈ 2 disks. Astrophysical Journal, 745(1), [11]. https://doi.org/10.1088/0004-637X/745/1/11

Short-lived star-forming giant clumps in cosmological simulations of z ≈ 2 disks. / Genel, Shy; Naab, Thorsten; Genzel, Reinhard; Förster Schreiber, Natascha M.; Sternberg, Amiel; Oser, Ludwig; Johansson, Peter H.; Dave, Romeel S; Oppenheimer, Benjamin D.; Burkert, Andreas.

In: Astrophysical Journal, Vol. 745, No. 1, 11, 20.01.2012.

Research output: Contribution to journalArticle

Genel, S, Naab, T, Genzel, R, Förster Schreiber, NM, Sternberg, A, Oser, L, Johansson, PH, Dave, RS, Oppenheimer, BD & Burkert, A 2012, 'Short-lived star-forming giant clumps in cosmological simulations of z ≈ 2 disks', Astrophysical Journal, vol. 745, no. 1, 11. https://doi.org/10.1088/0004-637X/745/1/11
Genel S, Naab T, Genzel R, Förster Schreiber NM, Sternberg A, Oser L et al. Short-lived star-forming giant clumps in cosmological simulations of z ≈ 2 disks. Astrophysical Journal. 2012 Jan 20;745(1). 11. https://doi.org/10.1088/0004-637X/745/1/11
Genel, Shy ; Naab, Thorsten ; Genzel, Reinhard ; Förster Schreiber, Natascha M. ; Sternberg, Amiel ; Oser, Ludwig ; Johansson, Peter H. ; Dave, Romeel S ; Oppenheimer, Benjamin D. ; Burkert, Andreas. / Short-lived star-forming giant clumps in cosmological simulations of z ≈ 2 disks. In: Astrophysical Journal. 2012 ; Vol. 745, No. 1.
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