The ionized gas in NGC 5128 - Evidence for a shock-heated component

Astronomy and Astrophysics – Astronomy

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Galactic Radiation, Ionized Gases, Radio Galaxies, Shock Heating, Elliptical Galaxies, Emission Spectra, H Ii Regions, Image Intensifiers, Line Spectra, Photoionization, Spiral Galaxies, Stellar Radiation

Scientific paper

Spectrophotometric and kinematic data for the ionized gas in the main body of the giant radio galaxy NGC 5128 are analyzed. An examination of the emission-line spectra shows that two basic types of gas are present: (1) discrete and diffuse low-ionization H II regions that are photoionized by the radiation of normal O and B stars; and (2) a turbulent diffuse component that emits a spectrum more typical of shock-ionized nebulae. The low-ionization gas is more or less confined to the general vicinity of the dust lane, while the shock-ionization component is located at the nucleus and over a large region at the edge of the dust lane in the southwest half of the main elliptical body of the galaxy. It is suggested that the shocked gas covers an even greater area of the elliptical component and may be connected with the extended X-ray emission that has recently been identified.

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