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The Jet-Cloud Interaction in 3CR Galaxies: Preliminary Results in Four Galaxies

Published online by Cambridge University Press:  01 August 2006

C. Feinstein
Affiliation:
Facultad de Ciencias Astronómicas y Geofísicas, Paseo del Bosque S/N, 1900, La Plata, Argentina, Ialp, Conicet. email: cfeinstein@fcaglp.unlp.edu.ar
F. D. Macchetto
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, MD21218, Baltimore, USA
M. F. Montero
Affiliation:
Instituto de Astronomía y Física del Espacio, Universidad de Buenos Aires, 1428, Argentina
G. F. Hägele
Affiliation:
Dpto. de Física Teórica, C-XI, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain. email: guille.hagele@uam.es
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Abstract

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We present preliminary results of the Gemini/GMOS longslit spectra for four radiogalaxies: 3C 135, 3C 180, 3C 234 and 3C 284. These objects are a subsample of a set of galaxies with noticeable extended structure selected from the HST/WFPC2 3CR Snapshot Survey, data taken with the filters F555W, F702W and narrow-ramp. All of these objects show large regions of [Oiii]λ5007 emission (narrow ramp filter) and the broad-band filters data show similar structures indicating the presence of strong emission in several lines over these regions. The morphology observed seems to be related (e.g. same position angle, direct overlapping or similar shape) with the radio-jet. For some candidates with these properties GMOS/Gemini spectroscopy was taken. These data (both HST direct imaging and Gemini spectroscopy) can be tested with diagnostic diagrams and total UV photons budget to understand the source of energy that is ionizing the gas. This source of ionization was commonly believed to be the UV photons emitted by the powerful AGN, but several of these objects shows clearly that shocks produce by the radio jet are the main cause of the observed gas line emission.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007