Stellar kinematics in double-barred galaxies: the sigma-hollows

Details Stellar kinematics in double-barred galaxies: the sigma-hollows Stellar kinematics in double-barred galaxies: the sigma-hollows

2008-08-04

arxiv.org/abs/0808.0517v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. Accepted for publication in ApJ Letters

Scientific paper

10.1086/592145

We present SAURON integral-field stellar velocity and velocity dispersion maps for four double-barred early-type galaxies: NGC2859, NGC3941, NGC4725 and NGC5850. The presence of the inner bar does not produce major changes in the line-of-sight velocity, but it appears to have an important effect in the stellar velocity dispersion maps: we find two sigma-hollows of amplitudes between 10 and 40 km/s on either side of the center, at the ends of the inner bars. We have performed numerical simulations to explain these features. Ruling out other possibilities, we conclude that the sigma-hollows are an effect of the contrast between two kinematically different components: the high velocity dispersion of the bulge and the more ordered motion (low velocity dispersion) of the inner bar.

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