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Astron. Astrophys. 337, 80-84 (1998)

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The circumnuclear ring of ionized gas in NGC 3593 *

E.M. Corsini 1, A. Pizzella 2, J.G. Funes ,  S.J. 3, J.C. Vega Beltrán 4 and F. Bertola 3

1 Osservatorio Astrofisico di Asiago, Dipartimento di Astronomia, Università di Padova, via dell'Osservatorio 8, I-36012 Asiago, Italy
2 European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Santiago 19, Chile
3 Dipartimento di Astronomia, Università di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy
4 Osservatorio Astronomico di Padova, Telescopio Nazionale Galileo, vicolo dell'Osservatorio 5, I-35122 Padova, Italy

Received 5 February 1998 / Accepted 19 May 1998


We present the results of narrow-band H[FORMULA]+[N II ] imaging of the early-type spiral NGC 3593 in combination with a study of the flux radial profiles of the [N II ] ([FORMULA] 654.80, 658.34 nm), H[FORMULA], and [S II ] ([FORMULA] 671.65, 673.08 nm) emission lines along its major axis. The galaxy is known to contain two counterrotating stellar discs of different size and luminosity. We find that the H[FORMULA] emission mainly derives from a small central region of [FORMULA][FORMULA][FORMULA]. It consists of a filamentary pattern with a central ring. This has a diameter of about [FORMULA] ([FORMULA] kpc) and it contributes about half of the total H[FORMULA] flux. The ring is interpreted as the result of the interaction between the acquired retrograde gas which later formed the smaller counterrotating stellar disc and the pre-existing prograde gas of the galaxy.

Key words: galaxies: individual: NGC 3593 – galaxies: interactions – galaxies: ISM – galaxies: spirals – galaxies: structure

* Based on observations carried out at ESO, La Silla (Chile) (ESO N. 52, 1-020) and on observations with the VATT: the Alice P. Lennon Telescope and the Thomas J. Bannan Astrophysics Facility.

Send offprint requests to: E.M. Corsini
Corrsepondence to: corsini@pd.astro.it

© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998