Double Bars, Inner Disks, and Nuclear Rings in Barred Galaxies
We present results of a high-resolution imaging survey of barred S0--Sa galaxies which demonstrate that the central regions of these galaxies are surprisingly complex. We see many inner bars---small, secondary bars (typically less than a kiloparsec in radius) located inside of, and probably rotating faster than, the large primary bars. These are
Erwin, Peter et al.
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2001