Double Bars and Inner Disks in Barred Galaxies

Details Double Bars and Inner Disks in Barred Galaxies Double Bars and Inner Disks in Barred Galaxies

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..275..271e&link_type=abstract

Disks of Galaxies: Kinematics, Dynamics and Peturbations, ASP Conference Proceedings, Vol. 275. Edited by E. Athanassoula, A. Bo

Astronomy and Astrophysics

Astronomy

Scientific paper

I present results of a high-resolution imaging survey of barred S0--Sa galaxies which show that the central regions of these galaxies are surprisingly complex, and often dominated by dynamically cool components. In particular, inner bars --- secondary, small-scale bars (typically less than a kiloparsec in radius) located inside of, and probably rotating faster than, the large-scale primary bars --- are present in about one quarter to one third of all such galaxies. A third of SB0's appear to host kiloparsec-scale disks within their large-scale bars; but the frequency of such inner disks is much lower for later Hubble types. I also include results from an ongoing analysis of about 50 known double-barred systems (extending to Hubble types as late as Sbc), and discuss their characteristic sizes, orientations, and implications for the nature of these structures.

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