Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.323..781f&link_type=abstract
Nature (ISSN 0028-0836), vol. 323, Oct. 30, 1986, p. 781-784. Research supported by the University of California.
Astronomy and Astrophysics
Astrophysics
14
Cosmology, Missing Mass (Astrophysics), Radioactive Decay, Relativistic Particles, Baryons, Galactic Rotation, Gravitational Collapse, Mass Distribution, Universe
Scientific paper
The decaying dark matter (DM) cosmology postulates that a heavy-elementary-particle species X first drives the formation of galaxies and clusters, and then decays nonradiatively, providing a smooth, undetected background of relativistic particles. The authors consider the effects of decaying DM on the radial distribution of mass in spiral galaxies, assumed to have formed through dissipative collapse inside a gravitationally induced protogalaxy consisting initially of a homogeneous mixture of dissipationless DM and a small fraction of dissipative baryonic material. The baryonic inner parts of galaxies are self gravitating, but mass loss from X decay causes the rotation velocity in the outer parts to decrease. It is found that the observed flat rotation curves cannot be obtained in these decaying DM models. Thus, a relativistic, weakly interacting decay product cannot be dominant.
Blumenthal George R.
Dekel Avishai
Flores Ricardo A.
Primack Joel R.
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