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Does the Andromeda Nebula (M31) have a Halo?


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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  1. Kraus, J. D., Nature, 202, 269 (1964).

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  2. Baldwin, J. E., and Costain, C. H., Mon. Not. Roy. Astro. Soc., 121, 413 (1960).

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  3. Large, M. I., Mathewson, D. S., and Haslam, C. G. T., Nature, 183, 1250 (1959).

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  4. 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).

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