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We present VLBI and MERLIN data at 1.66 and 4.99 GHz on the central componentcoincident with the nucleus of the giant radio galaxy, 3C236. The nuclear radiostructure is composed of two complexes of emission which are resolved on scalesfrom 1 milli-arcsec (mas) to 1 arcsec. Oscillations with an amplitude of about5 degrees can be seen in the compact radio structure. Spectral indexdistributions are plotted at angular resolutions of 10 and 25 mas and allow usto identify the core component in the south-east emission complex.Re-examination of the HST WFPC-2 image of 3C236 by de Koff et al. (2000), showsthat the normal to the dust disk in the nucleus is ~30 degrees from the planeof the sky and within 12 degrees of parallel to the overall orientation of theradio source. We suggest that the radio axis is also at an angle of ~30 degreesto the plane of the sky and that the north-west jet is on the approaching side.This orientation implies an overall size of 4.5 Mpc (H_o = 75 km/s/Mpc, q_o =0.5) for 3C236. The coincidence of a dust feature and the south-east compactjet, within the astrometric errors, leads us to suggest that the dust may be inthe form of a cloud encountered by the jet in the first ~400 pc of its journeyout from the nucleus. One-sided emission at 5 GHz on 1 mas scales would suggestthat the jets are ejected initially at <= 35 degrees to the line of sight, butthis is difficult to reconcile with the obvious orientation stability of thejet system as a whole. Free-free absorption of the counter-jet may be analternative explanation for the one-sideness.Comment: 11 pages, 9 figures, accepted for Astronomy and Astrophysic

VLBI, MERLIN and HST observations of the giant radio galaxy 3C 236