The effect of gasdynamics on the structure of dark matter halos
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
2001
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| _version_ | 1876462423012016128 |
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| author | Marcelo Alvarez |
| author_facet | Marcelo Alvarez |
| contents | The effect of gasdynamics on the structure of dark matter halos Marcelo Alvarez Paul R. Shapiro Hugo Martel Física, Astronomía y Matemáticas GALAX DARK MATTER IES: HALOES COSMOLOGY: THEORY GALAXIES: FORMATION Adaptive SPH and N-body simulations were carried out to study the e ect ofgasdynamics on the structure of dark matter halos that result from the gravitationalinstability and fragmentation of cosmological pancakes. Such halos resemble thoseformed in a hierarchically clustering CDM universe and serve as a test-bed modelfor studying halo dynamics. With no gas, the density prole is close to the uni-versal prole identied previously from N-body simulations of structure formationin CDM. When gas is included, the gas in the halo is approximately isothermal,and both the dark matter and the gas have singular central density proles whichare steeper than that of the dark matter with no gas. This worsens the disagree-ment between observations of constant density cores in cosmological halos and thesingular ones found in simulations. We also nd that the dark matter velocity dis-tribution is less isotropic than found by N-body simulations of CDM, because ofthe strongly lamentary substructure. 2001 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101029 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.10 |
| format | Artículo científico |
| id | redalyc_57101029 |
| institution | Redalyc |
| language | en |
| publishDate | 2001 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | The effect of gasdynamics on the structure of dark matter halos Marcelo Alvarez Física, Astronomía y Matemáticas GALAX DARK MATTER IES: HALOES COSMOLOGY: THEORY GALAXIES: FORMATION The effect of gasdynamics on the structure of dark matter halos Marcelo Alvarez Paul R. Shapiro Hugo Martel Física, Astronomía y Matemáticas GALAX DARK MATTER IES: HALOES COSMOLOGY: THEORY GALAXIES: FORMATION Adaptive SPH and N-body simulations were carried out to study the e ect ofgasdynamics on the structure of dark matter halos that result from the gravitationalinstability and fragmentation of cosmological pancakes. Such halos resemble thoseformed in a hierarchically clustering CDM universe and serve as a test-bed modelfor studying halo dynamics. With no gas, the density prole is close to the uni-versal prole identied previously from N-body simulations of structure formationin CDM. When gas is included, the gas in the halo is approximately isothermal,and both the dark matter and the gas have singular central density proles whichare steeper than that of the dark matter with no gas. This worsens the disagree-ment between observations of constant density cores in cosmological halos and thesingular ones found in simulations. We also nd that the dark matter velocity dis-tribution is less isotropic than found by N-body simulations of CDM, because ofthe strongly lamentary substructure. 2001 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101029 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.10 |
| title | The effect of gasdynamics on the structure of dark matter halos |
| topic | Física, Astronomía y Matemáticas GALAX DARK MATTER IES: HALOES COSMOLOGY: THEORY GALAXIES: FORMATION |
| url | https://www.redalyc.org/articulo.oa?id=57101029 |