Surface distribution of dark clouds in M31 absorption gradient along the major axis.

Details Surface distribution of dark clouds in M31 absorption gradient along the major axis. Surface distribution of dark clouds in M31 absorption gradient along the major axis.

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.176..123i&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 176, no. 1, Feb. 1991, p. 123-130.

Astronomy and Astrophysics

Astrophysics

4

Andromeda Galaxy, Dark Matter, Interstellar Matter, Molecular Clouds, Astronomical Models, Galactic Structure, Interstellar Extinction, Spatial Distribution

Scientific paper

The distribution of dense molecular clouds in M31 is studied, applying a combination of visual inspection and digital image-processing techniques to a photocopy of an image from the Hubble Atlas (Sandage, 1961). The analytical methods employed are outlined, and results are presented in graphs. The number of dark clouds per square kpc is found to vary periodically with distance along the major axis, suggesting that the filling factor used in the standard M31 cloud model may be an upper limit.

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