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arXiv:astro-ph/0011472 (astro-ph)
[Submitted on 25 Nov 2000 (v1), last revised 9 May 2001 (this version, v2)]

Title:Star Formation History and Stellar Metallicity Distribution in a Cold Dark Matter Universe

Authors:Kentaro Nagamine (Princeton), Masataka Fukugita (ICRR & IAS), Renyue Cen (Princeton), Jeremiah P. Ostriker (Princeton)
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Abstract: We study star formation history and stellar metallicity distribution in galaxies in a Lambda cold dark matter universe using a hydrodynamic cosmological simulation. Our model predicts star formation rate declining in time exponentially from an early epoch to the present with the time-scale of 6 Gyr, which is consistent with the empirical Madau plot with modest dust obscuration. Star formation in L^* galaxies continues intermittently to the present also with an exponentially declining rate of a similar time-scale, whereas in small galaxies star formation ceases at an early epoch. The mean age of the extant stars decreases only slowly with increasing redshift, and exceeds 1 Gyr at z=3. Normal galaxies contain stars with a wide range of metallicity and age: stars formed at z<1 have metallicity of 0.1-1.0 Zsun, while old stars take a wide range of values from 10^{-6} Zsun to 3.0 Zsun. The mean metallicity of normal galaxies is in the range 0.1-1.0 Zsun. Dwarf galaxies that contain only old stars have a wide range of mean metallicity (10^{-4}-1.0 Zsun), but on average they are metal deficient compared with normal galaxies.
Comments: 8 pages, 5 figures, emulateapj style. Accepted version in ApJ. More emphasis on the comparison with observations
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011472
  (or arXiv:astro-ph/0011472v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011472
Related DOI: https://doi.org/10.1086/322293

Submission history

From: Kentaro Nagamine [view email]
[v1] Sat, 25 Nov 2000 15:43:09 UTC (63 KB)
[v2] Wed, 9 May 2001 15:30:50 UTC (80 KB)
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