Radio-Frequency Radiation from the Spiral Nebula Messier 81

Details Radio-Frequency Radiation from the Spiral Nebula Messier 81 Radio-Frequency Radiation from the Spiral Nebula Messier 81

Nov 1953

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953natur.172..853h&link_type=abstract

Nature, Volume 172, Issue 4384, pp. 853 (1953).

Physics

6

Scientific paper

FOLLOWING the detection1 of radio-frequency radiation from the Great Nebula in Andromeda M.31, the 218-ft. paraboloid at the Jodrell Bank Experimental Station has been used for continuing the observations of extra-galactic nebulæ, and the preliminary results have already been published2. The survey has recently been extended to the region of sky around the bright Sb-type spiral nebula M.81, which is of particular interest since a previous survey3 failed to detect the radiation from this nebula, which is one of the brightest in the sky, although in the same survey fainter nebulæ were observed. Fig. 1 is a record of the power received with the aerial beam directed to declination N. 69°, and shows a radio source superimposed on a gradient of the background radiation. The co-ordinates and intensity of this source, together with those of the nebula, are given in Table 1, and in view of the close agreement of the co-ordinates, the source may be provisionally identified with the nebula.

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