Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190..833h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 190, Mar. 1980, p. 833-851. Research supported by the Department of Edu
Astronomy and Astrophysics
Astronomy
33
Interstellar Matter, Radio Emission, Radio Sources (Astronomy), Supernova Remnants, Astronomical Maps, Interstellar Magnetic Fields, Polarization Characteristics, Radial Distribution, Relativistic Electron Beams, Thermal Plasmas
Scientific paper
A map of Tycho's supernova remnant (3C 10) at 2.7 GHz with a resolution of 12 x 13 arcsec is presented. The remnant shows irregularities down to a scale less than 0.1 pc and is expanding into an inhomogeneous medium having a number density 0.2 plus or minus 0.1 per cu cm to the SW, and about 0.1 per cu cm to the NE where there are also discrete clouds at least an order of magnitude denser. The outer edge of the radio remnant marks the shock front, and the emissivity profile requires either adiabatic (Sedov) expansion with a uniform distribution of relativistic electrons or isothermal expansion with relativistic electron density varying as the thermal plasma density. In either case energy arguments show that the interstellar magnetic field is amplified by an order of magnitude over the expected post-shock value. The radio spectral index is constant (to within 0.2) over the remnant, in the frequency range 0.4-15 GHz.
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