Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194...90k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 90-98.
Astronomy and Astrophysics
Astronomy
15
Galactic Evolution, Galactic Nuclei, Radiative Transfer, Radio Galaxies, Radio Jets (Astronomy), Very Large Array (Vla), Astronomical Maps, Emission Spectra, Gas Ionization, H Alpha Line
Scientific paper
The paper presents narrow-band optical images, long-slit spectra, and radio maps of the peculiar early-type galaxy NGC 2655. A large (6 kpc) and complex emission-line region is present, showing loops, filaments, and a strong off-nuclear knot. Emission-line ratios indicate that all of this gas is excited by processes other than photoionization by hot stars. Its kinematics cannot be fully specified from our data; local motions of several hundred km/s exist. The radio structure includes small-scale jets from the nucleus, and an extended counterpart to the strongest off-nuclear optical emission region. In this emission region, the thermal and radio-emitting plasmas are in rough pressure balance. It is suggested that the optical emission is powered by the radio plasma, either via shocks or by a local ionizing continuum. This system would then be a low-luminosity version of some powerful radio galaxies with discrete high-ionization emission regions found well away from their nuclei.
Hummel Evi
Keel William C.
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