The Sombrero Galaxy III. Ionised gas and dust in the central 200 pc: a nuclear bar?

Details The Sombrero Galaxy III. Ionised gas and dust in the central 200 pc: a nuclear bar? The Sombrero Galaxy III. Ionised gas and dust in the central 200 pc: a nuclear bar?

2000-03-13

arxiv.org/abs/astro-ph/0003167v1

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, accepted for pub. in A&A Main Journal

Scientific paper

We present the results of new 3D TIGER spectroscopic observations and archived HST/WFPC2 and NICMOS images of the central region of M 104. The [NII]+Ha images reveal the presence of a nuclear spiral structure, and the gaseous kinematics in the central arcsecond shows evidence for kinematical decoupling of the central peak. A straight nuclear dust lane, with a weak symmetric counterpart, is seen in the V-I and V-H colour maps. These results hint for the presence of a strong nuclear bar, that would be located inside the inner Linblad resonance of the large-scale bar discussed by Emsellem (1995).

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