A detailed study of the nuclear region of Mrk 273
  We present 5 GHz EVN+MERLIN observations of the nuclear region of the ultra luminous infrared galaxy Mrk 273. These observations confirms the detection, on the mas scale, of two resolved component labelled as N and SE in the literature. We use published VLBA observations at 1.4 GHz, at the same resolution, to derive spectral index information of component N and SE and discuss these findings in relation with different hypothesis (compact starburst or AGN) for the origin of the radio emission. 
M. Bondi (1), D. Dallacasa (2), M.A. Peerez Torres (3), T.W.B. Muxlow   (4) ((1) Istituto di Radioastronomia, Italy, (2) Dip...