Rotating disk galaxies - Yet another case for dark matter

Details Rotating disk galaxies - Yet another case for dark matter Rotating disk galaxies - Yet another case for dark matter

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356...83p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 83-86. Research supported by the University of Durha

Other

16

Dark Matter, Disk Galaxies, Galactic Rotation, Astronomical Photometry, Galactic Mass, Galactic Structure, Luminosity

Scientific paper

A method to probe the systematic variations of the dark matter mass fraction (DM) in the optical region of disk galaxies is proposed, based on studying the correlation between galaxy luminosity and the normalized radius where the rotation frequency exceeds a given multiple of the rotation frequency as measured at the optical disk radius. The results strongly suggest the ubiquitous existence of DM throughout the luminosity sequence of galaxies, thereby challenging the possibility that luminous matter alone can be responsible for the observed disk dynamics. By modeling the distribution of dark matter by means of a pseudoisothermal halo, it is shown that the disk-to-halo mass ratio at the optical edge varies with luminosity.

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