THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE
We investigate how different cosmological parameters, such as those delivered by the WMAP and Planck missions, affect the nature and evolution of the dark matter halo substructure. We use a series of flat Λ cold dark matter cosmological N-body simulations of structure formation, each with a differen...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2014
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| Online Access: | http://hdl.handle.net/1721.1/88574 https://orcid.org/0000-0001-6176-9583 https://orcid.org/0000-0001-8593-7692 https://orcid.org/0000-0001-8745-5830 https://orcid.org/0000-0002-4863-8842 https://orcid.org/0000-0002-2139-7145 |
| _version_ | 1826214414555021312 |
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| author | Zukin, Phillip Vogelsberger, Mark Hernquist, L. Dooley, Gregory Alan Ji, Alexander Pung Frebel, Anna L. Griffen, Brendan F. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Zukin, Phillip Vogelsberger, Mark Hernquist, L. Dooley, Gregory Alan Ji, Alexander Pung Frebel, Anna L. Griffen, Brendan F. |
| author_sort | Zukin, Phillip |
| collection | MIT |
| description | We investigate how different cosmological parameters, such as those delivered by the WMAP and Planck missions, affect the nature and evolution of the dark matter halo substructure. We use a series of flat Λ cold dark matter cosmological N-body simulations of structure formation, each with a different power spectrum but with the same initial white noise field. Our fiducial simulation is based on parameters from the WMAP seventh year cosmology. We then systematically vary the spectral index, n[subscript s]; matter density, Ω [subscript M]; and normalization of the power spectrum, σ[subscript 8], for seven unique simulations. Across these, we study variations in the subhalo mass function, mass fraction, maximum circular velocity function, spatial distribution, concentration, formation times, accretion times, and peak mass. We eliminate dependence of subhalo properties on host halo mass and average the values over many hosts to reduce variance. While the "same" subhalos from identical initial overdensity peaks in higher σ[subscript 8], n[subscript s], and Ω [subscript m] simulations accrete earlier and end up less massive and closer to the halo center at z = 0, the process of continuous subhalo accretion and destruction leads to a steady state distribution of these properties across all subhalos in a given host. This steady state mechanism eliminates cosmological dependence on all of the properties listed above except for subhalo concentration and V [subscript max], which remain greater for higher σ[subscript 8], n[subscript s], and Ω [subscript m] simulations, and subhalo formation time, which remains earlier. We also find that the numerical technique for computing the scale radius and the halo finder that were used can significantly affect the concentration-mass relationship as computed for a simulation. |
| first_indexed | 2024-09-23T16:04:44Z |
| format | Article |
| id | mit-1721.1/88574 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:04:44Z |
| publishDate | 2014 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/885742022-09-29T18:05:24Z THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE Zukin, Phillip Vogelsberger, Mark Hernquist, L. Dooley, Gregory Alan Ji, Alexander Pung Frebel, Anna L. Griffen, Brendan F. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Dooley, Gregory Alan Griffen, Brendan Francis Ji, Alexander Pung Vogelsberger, Mark Frebel, Anna L. We investigate how different cosmological parameters, such as those delivered by the WMAP and Planck missions, affect the nature and evolution of the dark matter halo substructure. We use a series of flat Λ cold dark matter cosmological N-body simulations of structure formation, each with a different power spectrum but with the same initial white noise field. Our fiducial simulation is based on parameters from the WMAP seventh year cosmology. We then systematically vary the spectral index, n[subscript s]; matter density, Ω [subscript M]; and normalization of the power spectrum, σ[subscript 8], for seven unique simulations. Across these, we study variations in the subhalo mass function, mass fraction, maximum circular velocity function, spatial distribution, concentration, formation times, accretion times, and peak mass. We eliminate dependence of subhalo properties on host halo mass and average the values over many hosts to reduce variance. While the "same" subhalos from identical initial overdensity peaks in higher σ[subscript 8], n[subscript s], and Ω [subscript m] simulations accrete earlier and end up less massive and closer to the halo center at z = 0, the process of continuous subhalo accretion and destruction leads to a steady state distribution of these properties across all subhalos in a given host. This steady state mechanism eliminates cosmological dependence on all of the properties listed above except for subhalo concentration and V [subscript max], which remain greater for higher σ[subscript 8], n[subscript s], and Ω [subscript m] simulations, and subhalo formation time, which remains earlier. We also find that the numerical technique for computing the scale radius and the halo finder that were used can significantly affect the concentration-mass relationship as computed for a simulation. National Science Foundation (U.S.). Graduate Research Fellowship Program (Grant 1122374) 2014-08-07T14:27:29Z 2014-08-07T14:27:29Z 2014-05 2013-12 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/88574 Dooley, Gregory A., Brendan F. Griffen, Phillip Zukin, Alexander P. Ji, Mark Vogelsberger, Lars E. Hernquist, and Anna Frebel. “THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE.” The Astrophysical Journal 786, no. 1 (May 1, 2014): 50. https://orcid.org/0000-0001-6176-9583 https://orcid.org/0000-0001-8593-7692 https://orcid.org/0000-0001-8745-5830 https://orcid.org/0000-0002-4863-8842 https://orcid.org/0000-0002-2139-7145 en_US http://dx.doi.org/10.1088/0004-637X/786/1/50 The Astrophysical Journal Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf IOP Publishing arXiv |
| spellingShingle | Zukin, Phillip Vogelsberger, Mark Hernquist, L. Dooley, Gregory Alan Ji, Alexander Pung Frebel, Anna L. Griffen, Brendan F. THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE |
| title | THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE |
| title_full | THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE |
| title_fullStr | THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE |
| title_full_unstemmed | THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE |
| title_short | THE EFFECTS OF VARYING COSMOLOGICAL PARAMETERS ON HALO SUBSTRUCTURE |
| title_sort | effects of varying cosmological parameters on halo substructure |
| url | http://hdl.handle.net/1721.1/88574 https://orcid.org/0000-0001-6176-9583 https://orcid.org/0000-0001-8593-7692 https://orcid.org/0000-0001-8745-5830 https://orcid.org/0000-0002-4863-8842 https://orcid.org/0000-0002-2139-7145 |
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