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| HAL : hal-00431280, version 5 |
| arXiv : 0911.2238 |
| Fiche détaillée |  Récupérer au format |
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| Versions disponibles : | v1 (11-11-2009) | v2 (12-11-2009) | v3 (07-12-2009) | v4 (30-07-2010) | v5 (12-11-2010) |
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| Black Holes and Galactic Density Cusps : From Black Hole to Bulge |
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Morgan Le Delliou 1Richard Henriksen 2 |
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| (11/11/2009) |
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| Aims. In this paper we continue our study of density cusps that may contain central black holes. Methods. We recall our attempts to use distribution functions with a memory of self-similar relaxation, but mostly they apply only in restricted regions of the global system. We are forced to consider related distribution functions that are steady but not self-similar. Results. One remarkably simple distribution function that has a filled loss cone describes a bulge that transits from a near black hole domain to an outer 'zero flux' regime where$\rho\propto r^{-7/4}$. The transition passes from an initial inverse square profile through a region having a 1/r density profile. The structure is likely to be developed at an early stage in the growth of a galaxy. A central black hole is shown to grow exponentially in this background with an e-folding time of a few million years. Conclusions. We derive our results from first principles, using only the angular momentum integral in spherical symmetry. The initial relaxation probably requires bar instabilities and clump-clump interactions. |
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| 1 : | Instituto de Física Teórica (IFT) |
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UAM – CSIC |
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| 2 : | Queen's University (QUARG) |
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Queen's University, Kingston, Ontario |
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| 3 : | Faculty of Science, University of Ontario Institute of Technology (FScUOIT) |
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university of Ontario Institute of Technology |
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| Domaine | : | Physique/Astrophysique/Astrophysique galactique Planète et Univers/Astrophysique/Astrophysique galactique |
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| theory – dark matter – galaxies:haloes – galaxies:nuclei – black hole physics – gravitation |
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| Liste des fichiers attachés à ce document : | ||||||||||
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| hal-00431280, version 5 | |
| http://hal.archives-ouvertes.fr/hal-00431280 | |
| oai:hal.archives-ouvertes.fr:hal-00431280 | |
| Contributeur : Morgan Le Delliou | |
| Soumis le : Jeudi 11 Novembre 2010, 18:49:05 | |
| Dernière modification le : Vendredi 12 Novembre 2010, 06:53:17 | |
