Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 369, Issue 2, Pages 853-859Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2006.10359.x
Keywords
galaxies : active; galaxies : evolution; galaxies : kinematics and dynamics; galaxies : nuclei; galaxies : Seyfert; galaxies : spiral
Categories
Ask authors/readers for more resources
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 sigma-drop) could be created in a hot medium (e.g. a bulge) and survive enough time to be observed. We found that the time-scale for a sigma-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 1 M(circle dot) yr(-1), is mandatory to sustain a permanent sigma-drop by replacing heated particles by new low-sigma ones. We moreover show that as soon as star formation is switched off, the sigma-drop begins to disappear.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available