Declining rotation curves - The end of a conspiracy?

Details Declining rotation curves - The end of a conspiracy? Declining rotation curves - The end of a conspiracy?

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1231c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, April 1991, p. 1231-1241. Research supported by ZWO and Rijksuniversiteit Groni

Astronomy and Astrophysics

Astronomy

212

Angular Velocity, Dark Matter, Galactic Rotation, Luminosity, Spiral Galaxies, Galactic Mass, Very Large Array (Vla)

Scientific paper

Two new H I rotation curves, observed at the Very Large Array as part of a search for galaxies with extended H I envelopes, are presented. The two curves are characterized by a large decrease in rotation velocity (more than 50 km/s, or about 25 percent of the maximum rotation velocity) between 1 and 3 optical radii. The velocity decrease is present on both sides of each galaxy and is not due to projection effects. The decrease in rotation velocity is interpreted as an indication of a large ratio of luminous to dark mass in the luminous regions of these systems. While confirming the idea that dark matter is ubiquitous, the discovery indicates that the match between the properties of luminous and dark matter required by the well-known 'conspiracy' is not perfect.

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