1998•The Astrophysical JournalOpen access

The Nuclear Spectrum of the Radio Galaxy NGC 5128 (Centaurus A)

Chris Simpson, Vikki Meadows

Abstract

We present near-infrared spectra of the nuclear disk in the nearby radio galaxy NGC 5128 (Centaurus A).On the basis of the observed strengths of the [S iii] 0.9532 mm and [Fe ii] 1.2567 mm lines, we classify NGC 5128 as a LINER.Modeling of the strengths of these and additional lines suggests that the nuclear region is powered by shocks rather than by photoionization.

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Key concepts: Centaurus A, Radio galaxy, Astrophysics, Physics, X-shaped radio galaxy, Galaxy, Astronomy, Spectrum (functional analysis)