NED object is NGC 1097; Reference is  1983ApJ...269L..47O

   Fig. 1.- Contour diagram of the 20 cm radio emission in the bar of NGC 1097
 superposed on a blue photograph taken by H. C. Arp.  The contour levels are:
 0.2, 0.35, 0.6, 1, 10, and 20 mJy per beam.  North is up and east is to left. 
 For clarity, only contours within the box indicated were drawn.  The
 synthesizedbeam is indicated by the hatched ellipse in the lower left.