NED object is NGC 4839; Reference is 1985MNRAS.215..437C

   Figure 1. NGC 4839 at 151 MHz. Contour interval is 25 mJy beam**(-1) up to
 100 mJy beam**(-1) and then at an interval of 100 mJy beam**(-1). Negative
 contours are shown dashed. The HPBW is indicated by the L-shape in the figure
 and the galaxy nucleus is marked by a cross. All coordinates in these figures
 are for epoch 1950.0.