Damped Lyman α absorbers as a probe of stellar feedback
We examine the abundance, clustering and metallicity of Damped Lyman α Absorbers (DLAs) in a suite of hydrodynamic cosmological simulations using the moving mesh code arepo. We incorporate models of supernova and AGN feedback, as well as molecular hydrogen formation. We compare our simulations to th...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Oxford University Press
2015
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| Online Access: | http://hdl.handle.net/1721.1/98455 https://orcid.org/0000-0001-8593-7692 |
| _version_ | 1826202023984365568 |
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| author | Bird, Simeon Vogelsberger, Mark Haehnelt, Martin Sijacki, Debora Genel, Shy Torrey, Paul Springel, Volker Hernquist, Lars |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Bird, Simeon Vogelsberger, Mark Haehnelt, Martin Sijacki, Debora Genel, Shy Torrey, Paul Springel, Volker Hernquist, Lars |
| author_sort | Bird, Simeon |
| collection | MIT |
| description | We examine the abundance, clustering and metallicity of Damped Lyman α Absorbers (DLAs) in a suite of hydrodynamic cosmological simulations using the moving mesh code arepo. We incorporate models of supernova and AGN feedback, as well as molecular hydrogen formation. We compare our simulations to the column density distribution function at z = 3, the total DLA abundance at z = 2–4, the measured DLA bias at z = 2.3 and the DLA metallicity distribution at z = 2–4. Our preferred models produce populations of DLAs in good agreement with most of these observations. The exception is the DLA abundance at z < 3, which we show requires stronger feedback in 10[superscript 11–12] h[superscript −1] M[subscript ⊙] mass haloes. While the DLA population probes a wide range of halo masses, we find the cross-section is dominated by haloes of mass 10[superscript 10]–10[superscript 11] h[superscript −1] M[subscript ⊙] and virial velocities 50–100 km s[superscript −1]. The simulated DLA population has a linear theory bias of 1.7, whereas the observations require 2.17 ± 0.2. We show, however, that non-linear growth increases the bias in our simulations to 2.3 at k = 1 h Mpc[superscript −1], the smallest scale observed. The scale-dependence of the bias is, however, very different in the simulations compared against the observations. We show that, of the observations we consider, the DLA abundance and column density function provide the strongest constraints on the feedback model. |
| first_indexed | 2024-09-23T12:00:50Z |
| format | Article |
| id | mit-1721.1/98455 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:00:50Z |
| publishDate | 2015 |
| publisher | Oxford University Press |
| record_format | dspace |
| spelling | mit-1721.1/984552022-10-01T07:36:09Z Damped Lyman α absorbers as a probe of stellar feedback Bird, Simeon Vogelsberger, Mark Haehnelt, Martin Sijacki, Debora Genel, Shy Torrey, Paul Springel, Volker Hernquist, Lars Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Vogelsberger, Mark We examine the abundance, clustering and metallicity of Damped Lyman α Absorbers (DLAs) in a suite of hydrodynamic cosmological simulations using the moving mesh code arepo. We incorporate models of supernova and AGN feedback, as well as molecular hydrogen formation. We compare our simulations to the column density distribution function at z = 3, the total DLA abundance at z = 2–4, the measured DLA bias at z = 2.3 and the DLA metallicity distribution at z = 2–4. Our preferred models produce populations of DLAs in good agreement with most of these observations. The exception is the DLA abundance at z < 3, which we show requires stronger feedback in 10[superscript 11–12] h[superscript −1] M[subscript ⊙] mass haloes. While the DLA population probes a wide range of halo masses, we find the cross-section is dominated by haloes of mass 10[superscript 10]–10[superscript 11] h[superscript −1] M[subscript ⊙] and virial velocities 50–100 km s[superscript −1]. The simulated DLA population has a linear theory bias of 1.7, whereas the observations require 2.17 ± 0.2. We show, however, that non-linear growth increases the bias in our simulations to 2.3 at k = 1 h Mpc[superscript −1], the smallest scale observed. The scale-dependence of the bias is, however, very different in the simulations compared against the observations. We show that, of the observations we consider, the DLA abundance and column density function provide the strongest constraints on the feedback model. 2015-09-11T12:29:55Z 2015-09-11T12:29:55Z 2014-10 2014-09 Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 http://hdl.handle.net/1721.1/98455 Bird, S., M. Vogelsberger, M. Haehnelt, D. Sijacki, S. Genel, P. Torrey, V. Springel, and L. Hernquist. “Damped Lyman Absorbers as a Probe of Stellar Feedback.” Monthly Notices of the Royal Astronomical Society 445, no. 3 (October 17, 2014): 2313–2324. https://orcid.org/0000-0001-8593-7692 en_US http://dx.doi.org/10.1093/mnras/stu1923 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press arXiv |
| spellingShingle | Bird, Simeon Vogelsberger, Mark Haehnelt, Martin Sijacki, Debora Genel, Shy Torrey, Paul Springel, Volker Hernquist, Lars Damped Lyman α absorbers as a probe of stellar feedback |
| title | Damped Lyman α absorbers as a probe of stellar feedback |
| title_full | Damped Lyman α absorbers as a probe of stellar feedback |
| title_fullStr | Damped Lyman α absorbers as a probe of stellar feedback |
| title_full_unstemmed | Damped Lyman α absorbers as a probe of stellar feedback |
| title_short | Damped Lyman α absorbers as a probe of stellar feedback |
| title_sort | damped lyman α absorbers as a probe of stellar feedback |
| url | http://hdl.handle.net/1721.1/98455 https://orcid.org/0000-0001-8593-7692 |
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