Lifetime of nuclear velocity dispersion drops in barred galaxies
arXiv:astro-ph/0603784 · doi:10.1111/j.1365-2966.2006.10359.x
Abstract
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.
arXiv comment7 pages, 7 figures, accepted for publication in MNRAS
References in corpus (12)
- Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
- GADGET: A code for collisionless and gasdynamical cosmological simulations
- The SAURON project. II. Sample and early results
- Morphology, photometry and kinematics of N-body bars. I Three models with different halo central concentrations
- Dynamics of embedded bars and the connection with AGN. I. ISAAC/VLT stellar kinematics
- Measurement of fast bars in a sample of early-type barred galaxies
- Seyfert Activity and Nuclear Star Formation in the Circinus Galaxy
- Gas and stellar dynamics in NGC 1068. Probing the galactic gravitational potential
- Extended stellar kinematics of elliptical galaxies in the Fornax cluster
- The detection of stellar velocity dispersion drops in the central regions of five isolated Seyfert spirals
- An investigation of the structure and kinematics of the spiral galaxy NGC 6503
- Photometric and dynamic evolution of an isolated disc galaxy simulation
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