A correspondence between optical and radio emission in the Crab-type supernova remnant 3 C 58

Details A correspondence between optical and radio emission in the Crab-type supernova remnant 3 C 58 A correspondence between optical and radio emission in the Crab-type supernova remnant 3 C 58

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..271w&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 3, Apr. 1980, p. 271-276.

Astronomy and Astrophysics

Astronomy

11

Astronomical Photography, Crab Nebula, Light (Visible Radiation), Radio Emission, Supernova Remnants, Astronomical Maps, Continuous Radiation, Depolarization, Nonthermal Radiation, Radio Astronomy

Scientific paper

A comparison of the radio maps of the Crab-type supernova remnant (plerion) 3C 58 with an optical photograph of the region reveals significant correlation. Thermal filaments appearing on the photograph are seen to correspond to areas of enhanced radio continuum emission and increased depolarization. Estimates of the properties of the optical filaments indicate that the excess radio continuum cannot be due to thermal radiation from the filaments themselves and must be caused by a nonthermal process. A possible increased magnetic field near the filaments due to large internal currents is discussed. However, nonthermal radio radiation from interstellar magnetic field and relativistic electrons compressed and accelerated by the expanding supernova remnant is considered more likely. Similarities to the situation in the Crab Nebula are discussed and an observational test is proposed to distinguish between the two mechanisms. The increased depolarization near the optical filaments in 3C 58 is undoubtedly due to their large internal thermal electron densities and magnetic fields causing large Faraday rotations.

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