NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T03:54:08 PDT
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For refcode 2006MNRAS.369..853W:
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Copyright by Royal Astronomical Society. 2006MNRAS.369..853W Lifetime of nuclear velocity dispersion drops in barred galaxies Wozniak, Herve; Champavert, Nicolas 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_ 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. Key words: galaxies: active: galaxies: evolution: galaxies: kinematics and dynamics: galaxies: nuclei: galaxies: Seyfert: galaxies: spiral
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