The equilibrium structure of cosmological halos: from dwarf galaxies to x-ray clusters
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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2001
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| _version_ | 1876434550403366912 |
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| author | Ilian T. Iliev |
| author_facet | Ilian T. Iliev |
| contents | The equilibrium structure of cosmological halos: from dwarf galaxies to x-ray clusters Ilian T. Iliev Paul R. Shapiro Física, Astronomía y Matemáticas GALAX DARK MATTER GALAXIES: HALOS COSMOLOGY: THEORY GALAXIES: FORMATION A new model for the postcollapse equilibrium structure of virialized objectswhich condense out of the cosmological background universe is described and com-pared with observations and simulations of cosmological halos. The model is basedupon the assumption that virialized halos are isothermal, which leads to a predic-tion of a unique nonsingular isothermal sphere for the equilibrium structure, witha core density which is proportional to the mean background density at the epochof collapse. These predicted nonsingular isothermal spheres are in good agreementwith observations of the internal structure of dark{matter{dominated halos fromdwarf galaxies to X{ray clusters. Our model also reproduces many of the averageproperties of halos in CDM simulations to good accuracy, suggesting that it is auseful analytical approximation for halos which form from realistic initial condi-tions. While N{body simulations nd proles with a central cusp, our nonsingularmodel matches the simulated halos outside the innermost region well. This modelmay also be of interest as a description of halos in nonstandard CDM models likeself{interacting dark matter, which have been proposed to eliminate the discrep-ancy between the cuspy halos of standard CDM simulations and observed haloswith uniform{density cores. 2001 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101032 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_57101032 |
| institution | Redalyc |
| language | en |
| publishDate | 2001 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | The equilibrium structure of cosmological halos: from dwarf galaxies to x-ray clusters Ilian T. Iliev Física, Astronomía y Matemáticas GALAX DARK MATTER GALAXIES: HALOS COSMOLOGY: THEORY GALAXIES: FORMATION The equilibrium structure of cosmological halos: from dwarf galaxies to x-ray clusters Ilian T. Iliev Paul R. Shapiro Física, Astronomía y Matemáticas GALAX DARK MATTER GALAXIES: HALOS COSMOLOGY: THEORY GALAXIES: FORMATION A new model for the postcollapse equilibrium structure of virialized objectswhich condense out of the cosmological background universe is described and com-pared with observations and simulations of cosmological halos. The model is basedupon the assumption that virialized halos are isothermal, which leads to a predic-tion of a unique nonsingular isothermal sphere for the equilibrium structure, witha core density which is proportional to the mean background density at the epochof collapse. These predicted nonsingular isothermal spheres are in good agreementwith observations of the internal structure of dark{matter{dominated halos fromdwarf galaxies to X{ray clusters. Our model also reproduces many of the averageproperties of halos in CDM simulations to good accuracy, suggesting that it is auseful analytical approximation for halos which form from realistic initial condi-tions. While N{body simulations nd proles with a central cusp, our nonsingularmodel matches the simulated halos outside the innermost region well. This modelmay also be of interest as a description of halos in nonstandard CDM models likeself{interacting dark matter, which have been proposed to eliminate the discrep-ancy between the cuspy halos of standard CDM simulations and observed haloswith uniform{density cores. 2001 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57101032 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 equilibrium structure of cosmological halos: from dwarf galaxies to x-ray clusters |
| topic | Física, Astronomía y Matemáticas GALAX DARK MATTER GALAXIES: HALOS COSMOLOGY: THEORY GALAXIES: FORMATION |
| url | https://www.redalyc.org/articulo.oa?id=57101032 |