Abstract
IN a recent article1, Ohio State University maps covering 300 square degrees of the sky surrounding the Andromeda Nebula (M31) were presented for two frequencies, 600 and 1,415 Mc/s. The radio isophotes close to M31 on the higher resolution (1,415 Mc/s) map are of particular interest and are shown in more detail in Fig. 1 as superimposed on a photograph taken for me by C. A. Feuchter. The area covered in Fig. 1 is about 14 square degrees (3.5° × 4°). The size of the antenna beam at half-power is 11′ × 35′ so that there are about 160 beam areas in the map. The isophote interval is in units of 0.05° K of antenna temperature.
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References
Kraus, J. D., Nature, 202, 269 (1964).
Baldwin, J. E., and Costain, C. H., Mon. Not. Roy. Astro. Soc., 121, 413 (1960).
Large, M. I., Mathewson, D. S., and Haslam, C. G. T., Nature, 183, 1250 (1959).
Lyngå, G., Commun. (Meddelande) Lund Astro. Observatory. Ser. II, No. 137 (1959).
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KRAUS, J. Does the Andromeda Nebula (M31) have a Halo?. Nature 202, 1202–1203 (1964). https://doi.org/10.1038/2021202a0
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DOI: https://doi.org/10.1038/2021202a0
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