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Astron. Astrophys. 357, 111-114 (2000)

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The Sombrero galaxy *

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

E. Emsellem and P. Ferruit

Centre de Recherche Astronomique de Lyon, 9 av. Charles André, 69561 Saint-Genis Laval Cedex, France

Received 22 February 2000 / Accepted 4 March 2000


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 [N II ]+H[FORMULA] 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 [FORMULA] and [FORMULA] 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).

Key words: galaxies: individual: M 104 – galaxies: evolution – galaxies: kinematics and dynamics – galaxies: nuclei – galaxies: photometry – galaxies: stellar content

* Based on observations taken with the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique of France, and the University of Hawaii, and observations with the NASA/ESA Hubble Space telescope obtained at the Space Telescope European Coordinating Facility, jointly operated by ESA and the European Southern Observatory.

Send offprint requests to: E. Emsellem (emsellem@obs.univ-lyon1.fr)

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© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000