Very extended ionized gas in radio galaxies. II - an optical and radio study of PKS 0349 - 27

Astronomy and Astrophysics – Astronomy

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Interstellar Gas, Ionized Gases, Optical Measurement, Radio Galaxies, Astronomical Spectroscopy, Elliptical Galaxies, Galactic Nuclei, Galactic Rotation, Gas Dynamics, Velocity Distribution

Scientific paper

An optical spectroscopic study of the excitation and dynamics of the ionized gas associated with the radio galaxy PKS 0349-27 is presented. The spectra of ionized gas away from the nucleus, while consistent in some ways with a photo-ionization mechanism, also give rise to difficulties in this interpretation. It may be that energy in the radio jet is responsible for some of the excitation and ionization, especially in the condensation or 'jet' to the north-east which corresponds in position to the alignment of the axis of the double radio structure. The gas appears to be rotating and expanding in the form of one or more rings. Possible mechanisms for creating the large extent of the gas and its relatively ordered motion are discussed. These include tidal interaction with companion galaxies, and mergers.

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