Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..937..331c&link_type=abstract
SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP Conference Proceedings, Volume 937, pp. 331-338 (2007).
Astronomy and Astrophysics
Astronomy
Supernovae, Radio, Microwave, Astronomical And Space-Research Instrumentation, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers
Scientific paper
Here we present two near-simultaneous spectra of a Type IIb supernova, SN 1993J taken around day ~3200 and ~3700, observed with the Giant Meterwave Radio Telescope (GMRT) and Very Large Array (VLA). We show the synchrotron cooling break in the optically thin part of both the spectra. Based on these two spectra 1.5 years apart, cooling break frequency seems to be evolving with time. We calculate the magnetic field evolution and put constraints on electron diffusion coefficient from the evolution in break frequency.
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