Low-frequency radio observations of the emission nebula NGC 2264

Details Low-frequency radio observations of the emission nebula NGC 2264 Low-frequency radio observations of the emission nebula NGC 2264

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982azh....59..263a&link_type=abstract

(Astronomicheskii Zhurnal, vol. 59, Mar.-Apr. 1982, p. 263-266.) Soviet Astronomy, vol. 26, Mar.-Apr. 1982, p. 160-163. Transla

Astronomy and Astrophysics

Astronomy

1

Low Frequencies, Nebulae, Radio Astronomy, Brightness Distribution, H Ii Regions, Nonthermal Radiation

Scientific paper

The H II region NGC 2264 has been observed with the UTR-2 radio telescope at 12.6, 14.7, 16.7, 20, and 25 MHz. The half-power resolution at 25 MHz was 28 x 36 arcmin. The brightness distribution is mapped at each frequency; the nebula appears distinctly in absorption against a brighter nonthermal radio background. Several physical parameters are determined for the H II region: an electron temperature within 2500 K of 4100 K, an emission measure of 0.000275/cm-pc, and an electron density of 2.7/cu cm. The average nonthermal radio-emission density in the medium between the sun and NGC 2264 at 12.6 MHz is within 20 K/pc of 108 K/pc.

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