Monitoring Young Supernovae in Arp 299


We propose two-frequency (2.3 and 8.4 GHz) monitoring of young radio supernovae in Arp 299 (NGC 3690) which have been discovered in our previous observations of this object. To date, we have detected ve young supernovae or supernova remnants in Source A of Arp 299, including one with a strongly inverted spectrum. In addition, a sixth object, Source D, located about 10 00 (2 kpc) to the south had its 2.3 GHz density increase by a factor of  6 between April 2002 and April 2003; this may be a young supernova that is just transitioning to become optically thin at low gigahertz frequencies. Our primary observational goals are to determine the spectrum and evolution of the apparent supernovae, as well as search for new objects. This monitoring will provide information about the supernova ages and the radio supernova rate, as well as the evolution of radio supernovae exploding in a much denser medium than most such objects that have been monitored previously.

Name Other * Institution Email Phone
James Ulvestad PI NRAO julvesta@nrao.edu
Susan Neff GSFC neff@thidwick.gsfc.nasa.gov 301 286-5137
Stacy Teng S University of Maryland stacyt@astro.umd.edu
* PI = Principal Investigator; T = Thesis observations; S = Student

Front Ends
Gregorian S(1.73 to 2.6 GHz) Gregorian X(8.2 to 10.0 GHz)

Back Ends
VLBA recorder and DAR

Type of Observing
Monitor Very Long Baseline Interferometry

Switching Type

Processor (correlator)

Allotted time 40.00 hours

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Updated 09/09/2005