A radio continuum survey of M 31 at 2695 MHz. II - Comparison of radio and optical data

Details A radio continuum survey of M 31 at 2695 MHz. II - Comparison of radio and optical data A radio continuum survey of M 31 at 2695 MHz. II - Comparison of radio and optical data

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....57....9b&link_type=abstract

Astronomy and Astrophysics, vol. 57, no. 1-2, May 1977, p. 9-31.

Astronomy and Astrophysics

Astronomy

63

Andromeda Galaxy, Milky Way Galaxy, Optical Properties, Radio Astronomy, Spatial Distribution, Astronomical Maps, Brightness Temperature, H Ii Regions, Hydrogen Atoms, Hydrogen Ions

Scientific paper

The extended radio continuum emission from M31 at 11 cm, corrected for unrelated point sources, is compared with the optical distributions of H II regions and OB associations as well as with brightness-temperature peaks in the H I line. It is found that the widths of continuum-emitting regions perpendicular to the plane of M31 is about 2 to 3 times the widths in H I and about twice the corresponding widths in the Galaxy, while the volume emissivity in M31 is at least 6 times smaller than in the Galaxy. The general distributions of the 11-cm continuum emission, H II regions, young stars, and H I are shown to be very similar in that all manifest the intense ring formed by arms 4 and 5. Five empirical power laws are obtained by quantifying the general correlation among the various constituents; these relate H II column density to brightness temperature, H II and H I column density, H II column density to average H I volume density, brightness temperature to H I column density, and brightness temperature to average H I volume density.

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