Qian, Y.-Z. and Wasserburg, G. J. (2003) Hierarchical structure formation and chemical evolution of damped Lyα systems. Astrophysical Journal Letters, 596 (1). L9-L12. ISSN 2041-8205. doi:10.1086/379144. https://resolver.caltech.edu/CaltechAUTHORS:20131113-103654887
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Abstract
We present a model for the chemical evolution of damped Lyα systems considering the production of "metals" by Type II supernovae and infall associated with hierarchical structure formation. The growth of metallicity in these systems is a reflection of the competition between astration and infall. The apparent late turn-on of these systems is due to the late cutoff of infall. The wide range in [Fe/H] at a given redshift is explained by the range of the times for the onset of star formation and the range of the times for infall cessation in different systems. The observed lower bound of [Fe/H] ≈ -3 follows from the very rapid initial rise of [Fe/H] subsequent to the onset of star formation. To reach [Fe/H] ≈ -3 from a metal-free initial state requires only ~30 Myr, so the probability of observing lower [Fe/H] values is very small.
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Additional Information: | © 2003 The American Astronomical Society. Received 2003 July 11; accepted 2003 August 19; published 2003 September 18. We wish to dedicate this Letter to Allan Sandage for galaxies of reasons. We thank Jason Prochaska for making available the new data that stimulated us to further consider DLA systems. Intense questioning by Michael Norman on the requirement of VMSs and a prompt inventory in our earlier models also provided a great stimulus. This work was supported in part by DOE grants DE-FG02-87ER40328, DE-FG02-00ER41149 (Y. Z. Q.), and DE-FG03-88ER13851 (G. J. W.), Caltech Division Contribution 8906(1108). | ||||||||||||
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Subject Keywords: | galaxies: abundances—galaxies: evolution—intergalactic medium | ||||||||||||
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Issue or Number: | 1 | ||||||||||||
DOI: | 10.1086/379144 | ||||||||||||
Record Number: | CaltechAUTHORS:20131113-103654887 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20131113-103654887 | ||||||||||||
Official Citation: | Hierarchical Structure Formation and Chemical Evolution of Damped Lyα Systems Y.-Z. Qian and G. J. Wasserburg 2003 ApJ 596 L9 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 42423 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | Tony Diaz | ||||||||||||
Deposited On: | 13 Nov 2013 22:46 | ||||||||||||
Last Modified: | 10 Nov 2021 16:22 |
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