Evidence against baryonic dark matter in elliptical galaxies

Details Evidence against baryonic dark matter in elliptical galaxies Evidence against baryonic dark matter in elliptical galaxies

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..648h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 648-652.

Statistics

Computation

12

Baryons, Computational Astrophysics, Dark Matter, Elliptical Galaxies, Black Holes (Astronomy), Galactic Structure, Gravitational Collapse, Mass To Light Ratios, Nuclear Fusion

Scientific paper

The presence of a dark halo, about 20 times more massive than the X-ray emitting gas, is necessary to explain the observations of X-ray halos surrounding some elliptical galaxies. The possibility is considered that the dark matter is baryonic, and, with the exception of massive black holes, it is found that baryons are unlikely to be the dominant form of dark matter in elliptical galaxies. In particular, optical observations of M87 to determine a 2 sigma lower limit on the mass-to-light (M/L) ratio of the galaxy and find M/L greater than 565 at r about 200 kpc are used. This limit is used to place a lower bound on the slope, 1 + x, of the low-mass portion of the initial mass function and find x greater than about 2. This is significantly larger than observationally determined values of the slope.

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