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Astron. Astrophys. 328, 493-498

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Sub-arcsecond resolution 2D (x,y,$\lambda$) spectrography
of the emission line region of NGC 5929 with TIGER*

P. Ferruit12, E. Pécontal1, A.S. Wilson2,3, and L. Binette4

1 CRAL - Observatoire de Lyon, 9 av. Charles André, F-69561 Saint-Genis-Laval Cedex, France
2 Astronomy Department, University of Maryland, College Park, MD 20742, USA
3 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USA
4 ESO, Casilla 19001, Santiago 19, Chile

Received 3 July 1997 / Accepted 22 July 1997


We report observations of the Seyfert 2 galaxy NGC 5929 with the integral field spectrograph TIGER. These 2D spectrographic data, with sub-arcsecond spatial resolution, consist of 394 flux-calibrated spectra, covering the [N II], H$\alpha$ and [S II] emission associated with the two radio-lobes. The two optical line emission components have been kinematically separated using Gaussian fitting of the spectra. From this decomposition, we have derived line intensities, ratios and velocities for each component. Although the line-of-sight velocities of the clouds are consistent with normal rotational motions, their high internal velocity dispersions and spatial association with the radio components clearly indicate an interaction between the radio ejecta and the ambient medium. We discuss four specific models describing this interaction but conclude that none of them is completely satisfactory.

Key words: galaxies: NGC 5929 - galaxies: Seyfert - galaxies: jets

*Based on observations collected at Canada-France-Hawaii Telescope, which is operated by CNRS of France, NRC of Canada, and the University of Hawaii

Send offprint requests to: P. Ferruit (pierre@astro.umd.edu)

© European Southern Observatory (ESO) 1997

Online publication: November 24, 1997
Last change: March 26, 1998