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2010MNRAS.407..163F - Mon. Not. R. Astron. Soc., 407, 163-180 (2010/September-1)
An observational estimate for the mean secular evolution rate in spiral galaxies.
FOYLE K., RIX H.-W. and ZIBETTI S.
Abstract (from CDS):
The individual torque profiles show that only a third of our sample exhibit torques strong enough to redistribute angular momentum within a Hubble time, mostly those with strong bars. However, advective angular momentum transport is another source of angular momentum redistribution, especially in the presence of long-lived spiral arms, but is not accessible to direct observations. The torque-driven angular momentum redistribution is thus observed to be effective, either in one-third of disc galaxies or in most disc galaxies one third of the time and should lead to either changes in the mass density profile or the orbital shapes.
We use a set of self-consistent disc, bulge and halo simulated isolated disc galaxies with realistic cold gas fractions to verify that the torques exerted by the stellar distribution, such as spiral arms or a bar, exceed those of the gas and halo, as assumed in the analysis of the observations.
This study is the first to observationally determine the strength of torque-driven angular momentum flow of stars for a sample of spiral galaxies, providing an important empirical constraint on secular evolution.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): methods: observational - galaxies: evolution - galaxies: kinematics and dynamics - galaxies: spiral
CDS comments: In table 2 : NGC 5317 = NGC 5364.
Simbad objects: 24
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