| タイトル | A family of models for spherical stellar systems |
| 著者（英） | Dressler, Alan; Tremaine, Scott; Kormendy, John; Lauer, Tod R.; Byun, Yong-Ik; Faber, S. M.; Richstone, Douglas O.; Grillmair, Carl |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1994-02-01 |
| 言語 | eng |
| 内容記述 | We describe a one-parameter family of models of stable sperical stellar systems in which the phase-space distribution function depends only on energy. The models have similar density profiles in their outer parts (rho propotional to r(exp -4)) and central power-law density cusps, rho proportional to r(exp 3-eta), 0 less than eta less than or = 3. The family contains the Jaffe (1983) and Hernquist (1990) models as special cases. We evaluate the surface brightness profile, the line-of-sight velocity dispersion profile, and the distribution function, and discuss analogs of King's core-fitting formula for determining mass-to-light ratio. We also generalize the models to a two-parameter family, in which the galaxy contains a central black hole; the second parameter is the mass of the black hole. Our models can be used to estimate the detectability of central black holes and the velocity-dispersion profiles of galaxies that contain central cusps, with or without a central black hole. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 95A65800 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/310352 |
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