Archimedes spiral and the surface distribution of dark clouds in M31. III

Details Archimedes spiral and the surface distribution of dark clouds in M31. III Archimedes spiral and the surface distribution of dark clouds in M31. III

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.184..227i&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 184, no. 2, Oct. 1991, p. 227-234.

Astronomy and Astrophysics

Astrophysics

1

Andromeda Galaxy, Molecular Clouds, Interstellar Matter, Radiation Absorption, Spatial Distribution

Scientific paper

The surface distribution of dark clouds along the major and minor axes were conpiled to give a general formula expressing the surface distribution along both axes simultaneously. Absorption values were determined, assuming the parameters of the standard cloud model as a function of the distance from the two-dimensional distribution of dark clouds. Iso-cloud line numbers were drawn as a function of both X and Y. Two knots appeared in the new distribution function. This may announce the beginning of the spiral arms. The knots may indicate the least possible number of the dark clouds per kiloparsec beyond which spiral structure may be possible. The projected distance of the two knots on the X-axis may correspond to some spiral features found by other investigators.

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