Lifetime of nuclear velocity dispersion drops in barred galaxies
| dc.creator | Wozniak, Herve | |
| dc.creator | Champavert, Nicolas | |
| dc.date | 2006-03-29 | |
| dc.date.accessioned | 2026-07-07T10:28:01Z | |
| dc.date.available | 2026-07-07T10:28:01Z | |
| dc.description | We have made hydro/N-body simulations with and without star formation to shed some light on the conditions under which a central kinematically cold stellar component (characterized by a velocity dispersion drop or σ-drop) could be created in a hot medium (e.g. a bulge) and survive enough time to be observed. We found that the timescale for a σ-drop formation could be short (less than 500 Myr) whereas its lifetime could be long (more than 1 Gyr) provided that the central region is continuously or regularly fed by fresh gas which leads to a continuous star formation activity. Star formation in the central region, even at a low rate as 1M_{sol} yr^{-1}, is mandatory to sustain a permanent σ-drop by replacing heated particles by new low-σones. We moreover show that as soon as star formation is switched off, the σ-drop begins to disappear. | |
| dc.description | 7 pages, 7 figures, accepted for publication in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0603784 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0603784 | |
| dc.identifier | Mon.Not.Roy.Astron.Soc.369:853-859,2006 | |
| dc.identifier | doi:10.1111/j.1365-2966.2006.10359.x | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/177309 | |
| dc.subject | Astrophysics | |
| dc.title | Lifetime of nuclear velocity dispersion drops in barred galaxies | |
| dc.type | text |