Is the surface density of galaxy disks always proportional to their surface brightness?

Details Is the surface density of galaxy disks always proportional to their surface brightness? Is the surface density of galaxy disks always proportional to their surface brightness?

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67..182j&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Jan.-Feb. 1990, p. 182-184. In Russian.

Astronomy and Astrophysics

Astronomy

Brightness Distribution, Density Distribution, Galactic Structure, Surface Properties, Astronomical Models, Galactic Rotation, Mass To Light Ratios

Scientific paper

A model in which galaxy disks have constant mass/luminosity ratios is used to study several galaxies with unexplained rotation curves. The photometric and modeled rotation curves of NGC 3054, 925, and 2366 are compared, demonstrating that there are cases in which variations in surface brightness are not correlated with variations in the surface density of the disk. Consideration is given to the possible explanations and implications of this result.

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