Chevalier 2006 射电波段的超新星和伽玛暴的成协

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astro-ph/0612734 [abs, ps, pdf, other] :

Title: Circumstellar Interaction Around Type Ib/c Supernovae and the GRB Connection
Authors: R. A. Chevalier
Comments: 8 pages, to appear in Circumstellar Media and Late Stages of Massive Stellar Evolution, RevMexAA

Radio observations of Type Ib/c supernovae suggest that circumstellar interaction takes place with a wide range of wind densities, comparable to that seen in Galactic Wolf-Rayet stars. Efficient production of magnetic field in the shocked region is needed. The X-ray emission observed from some Type Ib/c supernovae is higher than would be expected by the thermal or inverse Compton mechanisms; a synchrotron interpretation requires a flattening of the electron energy spectrum at high energies, as might occur in a cosmic ray dominated shock wave. The wind density variations that are indicated in two supernovae may be due to a binary companion, although variable mass loss from a single star remains a possibility. Other than the optical supernova radiation, the emission from the nearby SN 2006aj/GRB 060218 appears to be powered by a central engine, while that from SN 1998bw/GRB 980425 could be powered by either a central engine or the outer supernova ejecta.