Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-07-07
Astronomy and Astrophysics
Astrophysics
LaTeX, 6 pages including 2 PostScript figures, uses newpasp.sty. To appear in ``The central kpc of starbursts and AGN: the La
Scientific paper
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 present in about one quarter to one third of all our sample. In contrast to some theoretical expectations, they do not seem to enhance AGN activity significantly. A third of barred S0's appear to host kiloparsec-scale disks within their bars; but the frequency of such inner disks is much lower in our S0/a and Sa galaxies. In addition, we find one example of a triple barred galaxy, and two cases of purely stellar nuclear rings --- probably the fossil remnants of past circumnuclear starbursts. We comment briefly on results from an ongoing analysis of known double-barred systems, extending to Hubble types as late as Sbc, and discuss their characteristic sizes and orientations.
Beckman John
Erwin Peter
Sparke Linda S.
Vega Beltran Juan Carlos
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