EDP Sciences
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Volume 388, Number 1, June II 2002
Page(s) 50 - 67
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020406

A&A 388, 50-67 (2002)
DOI: 10.1051/0004-6361:20020406

Position-velocity diagrams of ionized gas in the inner regions of disk galaxies

J. G. Funes1, S. J.1, E. M. Corsini1, M. Cappellari1, A. Pizzella1, J. C. Vega Beltrán1, C. Scarlata1, 1 and F. Bertola1

1  Vatican Observatory, University of Arizona, Tucson, AZ 85721, USA Osservatorio Astrofisico di Asiago, Dipartimento di Astronomia, Università di Padova, via dell'Osservatorio 8, 36012 Asiago, Italy Leiden Observatory, Postbus 9513, 2300 RA Leiden, The Netherlands Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 2, 35122 Padova, Italy Instituto Astrofísico de Canarias, Calle Via Lactea s/n, 38200 La Laguna, Spain Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA

(Received 12 December 2001 / Accepted 18 March 2002 )

We use long-slit spectroscopy along the major axis of a sample of 23 nearby disk galaxies to study the kinematic properties of the ionized-gas component in their inner regions. For each galaxy, we derive the position-velocity diagram of the ionized gas from its emission lines. We discuss the variety of shapes observed in such position-velocity diagrams by comparing the gas velocity gradient, velocity dispersion and integrated flux measured in the inner ( $r\simeq\pm1''$) and outer regions ( $r\simeq\pm4''$). This kind of analysis allows the identification of galaxies which are good candidates to host a circumnuclear Keplerian gaseous disk rotating around a central mass concentration, and to follow up with Hubble Space Telescope observations.

Key words: galaxies: kinematics and dynamics -- galaxies: ISM -- galaxies: spiral -- galaxies: structure -- galaxies: nuclei -- black hole physics

Offprint request: J. G. Funes, S. J., jfunes@as.arizona.edu

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