2011A&A...527A.147M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST02:56:40

2011A&A...527A.147M - Astronomy and Astrophysics, volume 527A, 147-147 (2011/3-1)

Radial migration in galactic disks caused by resonance overlap of multiple patterns: self-consistent simulations.

MINCHEV I., FAMAEY B., COMBES F., DI MATTEO P., MOUHCINE M. and WOZNIAK H.

Abstract (from CDS):

We have recently identified a new radial migration mechanism resulting from the overlap of spiral and bar resonances in galactic disks. Here we confirm the efficiency of this mechanism in fully self-consistent, Tree-SPH simulations, as well as high-resolution pure N-body simulations. In all barred cases we clearly identify the effect of spiral-bar resonance overlap by measuring a bimodality in the changes of angular momentum in the disk, ΔL, whose maxima are near the bar's corotation and outer Lindblad resonance. This contrasts with the smooth distribution of ΔL for a simulation with no stable bar present, where strong radial migration is induced by multiple spirals. The presence of a disk gaseous component appears to increase the rate of angular momentum exchange by about 20%. The efficiency of this mechanism is such that galactic stellar disks can extend to over 10 scale-lengths within 1-3Gyr in both Milky Way size and low-mass galaxies (circular velocity ∼100km/s). We also show that metallicity gradients can flatten in less than 1Gyr rendering mixing in barred galaxies an order of magnitude more efficient than previously thought.

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Journal keyword(s): galaxies: evolution - galaxies: kinematics and dynamics - galaxies: abundances - galaxies: spiral

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1305 2
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5134 1

    Equat.    Gal    SGal    Ecl

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2020.07.08-02:56:40

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