Abstract
The results of observations of the Rosette emission nebula NGC 2237 with the radio telescope UTR-2 at frequencies 12.6, 14.7, 16.7, 20.0 and 25.0 MHz are given in the shape of contours of constant brightness temperature. The half-power beamwidth of the telescope to zenith at 25.0 MHz was 28′×38′. Density weighted mean values for the non-thermal radio emissivity between the Sun and the source (7.9×10−41 W m−3 Hz−1 ster−1 at 25.0 MHz) and the ratio of the intensity of emissivity generated before the area and the intensity of galactic radio emissivity appearing beyond the area equal to 1.3 have been obtained. The electron temperatureT e=3600 K, the optical depth (about ten at 25 MHz), the measure of emission (ME=3500 cm−6 pc), the electron densityN e=8 cm−3 and the nebular mass 16.6×10+3 M ⊙ have been determined. A comparison with other observation results has been made.
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Krymkin, V.V. Observations of the Rosette nebula NGC 2237 at decametric wavelengths. Astrophys Space Sci 54, 187–197 (1978). https://doi.org/10.1007/BF00637907
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DOI: https://doi.org/10.1007/BF00637907