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Astron. Astrophys. 361, 5-12 (2000)


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Integral field spectroscopy of the radio galaxy 3C 171 *

I. Márquez 1, E. Pécontal 2, F. Durret 3,4 and P. Petitjean 3,4

1 Instituto de Astrofísica de Andalucía (CSIC), Apartado 3004, 18080 Granada, Spain
2 Observatoire de Lyon, 9 avenue Charles André, 69561 St. Genis Laval, France
3 Institut d'Astrophysique de Paris, CNRS, 98bis Bd Arago, 75014 Paris, France
4 DAEC, Observatoire de Paris, CNRS (UA 173), Université Paris VII, 92195 Meudon Cedex, France

Received 12 April 2000 / Accepted 29 June 2000

Abstract

We have performed integral field spectroscopy of the radio galaxy 3C 171 (redshift z=0.238) with the TIGER instrument at the Canada France Hawaii telescope in the H[FORMULA]-[OIII]4959-5007 wavelength region. We present the reconstructed H[FORMULA] and [OIII] images and compare them to the HST and radio maps. We discuss the variations of the [OIII]/H[FORMULA] line ratio throughout the nebulosity. We also analyze the velocity field in detail, in particular the presence of several components. We find that the kinematics derived with emission lines in the central region (inside 1 arcsec) are compatible with a disk-like rotation of low amplitude (50 km s-1). The continuum surface brightness profile follows an [FORMULA] law, suggesting that the underlying galaxy is an elliptical with an effective radius of 15 kpc.

We have fit two components in the region centered 2.7 arcsec to the West and of extension 3 arcsec2. We find that the blueshifted component is an extension of the central part, whereas the second one is redshifted by 600 km s-1. In both components, line ratios and FWHM are compatible with the presence of shocks induced by jet-cloud interactions.

Key words: galaxies: active – galaxies: individual: 3C 171 – galaxies: ISM – galaxies: kinematics and dynamics – galaxies: quasars: emission lines

* Based on observations performed at the Canada France Hawaii Telescope

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© European Southern Observatory (ESO) 2000

Online publication: September 5, 2000

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