期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 447, 期 2, 页码 1834-1846出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu2542
关键词
galaxies: formation; intergalactic medium; cosmology: theory
资金
- National Science Foundation [AST-0907969]
- W.M. Keck Foundation
- NSF [AST-1109447]
- FP7 ERC Advanced Grant Emergence [320596]
- NASA ATP Award [NNX12AC67G]
- NSF grant [AST-1312095]
- STFC [ST/K000985/1] Funding Source: UKRI
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1109452, 1109447] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1312095] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/K000985/1] Funding Source: researchfish
- NASA [52414, NNX12AC67G] Funding Source: Federal RePORTER
We examine the kinematic structure of damped Lyman alpha systems (DLAs) in a series of cosmological hydrodynamic simulations using the AREPO code. We are able to match the distribution of velocity widths of associated low-ionization metal absorbers substantially better than earlier work. Our simulations produce a population of DLAs dominated by haloes with virial velocities around 70 km s(-1), consistent with a picture of relatively small, faint objects. In addition, we reproduce the observed correlation between velocity width and metallicity and the equivalent width distribution of Si II. Some discrepancies of moderate statistical significance remain; too many of our spectra show absorption concentrated at the edge of the profile and there are slight differences in the exact shape of the velocity width distribution. We show that the improvement over previous work is mostly due to our strong feedback from star formation and our detailed modelling of the metal ionization state.
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