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We present optical and near-infrared images and spectra of ESO248-G10, thehost of giant radio galaxy MRC B0319-454. From near-infrared colours, theactive nucleus is shown to be reddened by hot dust emission or dust extinction.Star forming regions are identified beyond a radius of 5" (8.1 kpc) where hotgas is prevalent. The optical spectrum shows gas rotation at speeds of up to350km/s out to >=32kpc along the radio axis. A model is proposed in which thegiant elliptical is triaxial with the radio axis along the short axis, and thefigure rotation is around the long axis. From the model, the angles of theprincipal axes are psi=34 degrees, theta=65 degrees, and phi=19 degrees withaxis ratios of B/A=0.75 and C/A=0.69. A second velocity feature from 5" to 15"to the north-east of the nucleus is proposed to be a merging gas-rich galaxyinducing star formation while settling into an orbit about the figure rotationaxis.Comment: Accepted for publication in The Astrophysical Journal. 22 pages, 12  figure

The Giant Radio Galaxy MRC B0319−454: Circumnuclear Structure of the Host Galaxy ESO 248‐G10