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We have made sensitive milliarcsecond-resolution radio images of the nearbymerger galaxy Arp 299 at four epochs spread over 18 months between 2003 and2005. The combined data revealed a total of 30 point sources in the two primarymerger nuclei. Twenty-five of these are found in the northeastern nucleus(component "A"=IC 694) over a region ~100 pc in diameter, while five are in thesouthwestern nucleus (component "B1"=NGC 3690) within a region ~30 pc in size.These objects are interpreted as young supernovae and supernova remnants; theratio of the source counts in nuclei A and B1 is approximately equal to theratio of their predicted supernova rates. An approximate luminosity functionhas been derived for nucleus A, and indicates that it might contain as many as500-1000 compact radio sources more powerful than Cas A; the integrated fluxdensity of these sources would be about 20% of the total flux density seen atlower resolution. A new supernova occurred in nucleus B1 in the first half of2005, having a peak radio power at least 2,000 times the present power ofCassiopeia A. This supernova is located within 0.4 pc (projected distance) ofan apparently older supernova remnant, making it very likely that thisindicates the presence of a massive super star cluster within nucleus B1.Comparison of the typical radio flux densities of our compact radio sources tothe observed X-ray luminosities of nuclei A and B1 indicates that it ispossible that one radio source in each nucleus actually could be associatedwith an active galactic nucleus rather than being a supernova remnant.

Radio Emission from Young Supernovae and Supernova Remnants in Arp 299