Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 684, Issue 2, Pages L83-L86Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/592145
Keywords
galaxies : kinematics and dynamics; galaxies : structure
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We present sauron integral-field stellar velocity and velocity dispersion maps for four double-barred earlytype galaxies: NGC 2859, NGC 3941, NGC 4725, and NGC 5850. 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(-1) 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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