Constraining Dark Halo Potentials with Tidal Tails
| Autor: | John Dubinski, Lars Hernquist, J. Christopher Mihos |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Context (language use) Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Escape velocity 01 natural sciences Galaxy Dark matter halo Space and Planetary Science Bulge 0103 physical sciences Halo Low Mass 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Galaxy rotation curve 0105 earth and related environmental sciences |
| Zdroj: | The Astrophysical Journal. 526:607-622 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/308024 |
| Popis: | We present an extensive parameter survey to study the influence of halo mass profiles on the development of tidal tails in interacting disk galaxies. We model the galaxies using a fixed exponential disk with a central bulge and vary the halo potential over a range of parameters using both the Hernquist and NFW mass distributions, probing the effect of the halo mass, extent and concentration. We examine the consistency of the results against both observational and theoretical constraints on halo profiles and comment on the failures and weaknesses of different models. Galaxies with rising or flat rotation curves dominated by the halo are inhibited from forming tidal tails unless the halo is abruptly cut off just beyond the disk edge. Conversely, models with declining rotation curves -- resulting either from compact, low mass halos, or from massive disk components in low concentration dark halos -- produce tidal tails very similar to those observed in well-studied interacting systems. As argued by Springel & White (1998), a unifying, quantitative relation for all cases is that the ratio of the escape velocity to the circular velocity at around the solar radius must be v_e/v_c 35 pages, 7 figures, go to http://www.cita.utoronto.ca/~dubinski/tt3/ for the online preprint, the hi-resolution postscript version and animations |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|