Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..718h&link_type=abstract
Astronomical Journal, vol. 82, Sept. 1977, p. 718-724, 772.
Astronomy and Astrophysics
Astronomy
48
Radio Astronomy, Radio Sources (Astronomy), Supernova Remnants, Brightness Temperature, Contours, Microwave Emission, Nebulae, Nonthermal Radiation, Size Determination, Stellar Evolution, Thermal Radiation
Scientific paper
Aperture-synthesis observations at 1.4 GHz show that the Gamma Cygni supernova remnant (SNR) has a shell structure of about 62-arcmin diameter, centered at Galactic longitude 78.2 deg, latitude +2.1 deg. Radio emission from the shell is strongest in the southeast quadrant, near the star Gamma Cygni, where it is concentrated in several tangentially elongated structures. A second region of enhanced nonthermal emission is in the northwest quadrant. Based on a brightness-diameter relation, the observed flux density of 270 + or - 40 Jy implies a diameter of approximately 33 pc and a distance of about 1.8 kpc. Thermal radio emission is observed from the Gamma Cygni Nebula which lies near Gamma Cygni and coincidentally near the peak emission of the SNR. The possible significance of the near positional agreement of the thermal and nonthermal radio sources is discussed.
Higgs Lloyd A.
Landecker Thomas L.
Roger Robert S.
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