Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524l..15g&link_type=abstract
The Astrophysical Journal, Volume 524, Issue 1, pp. L15-L18.
Astronomy and Astrophysics
Astronomy
7
Cosmology: Dark Matter, Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Individual: Messier Number: M87, Galaxies: Intergalactic Medium
Scientific paper
The empirical relation of coupling in M_d=gammaM^1/2r between the halo dark mass distribution M_d and visible mass M at radius r, previously shown in spiral galaxies and in the core of MS 2137-2353, is tested for the inner 150 h^-1 kpc Virgo Cluster core. If the stellar mass-to-light ratio in M87 is treated as a free parameter, the density distribution predicted by this relation is found to be consistent with that derived from published surface photometry, stellar and globular cluster dynamics, and X-ray observations. The best fit is obtained for Upsilon_*(M87)=6 (M/L_B)_solar, but a wide range of stellar mass-to-light ratios are possible. At r>50 kpc, the relation of coupling and the equation of dynamical equilibrium of the gas are the same. The extrapolated dark mass is also consistent with the kinematics of early-type galaxies on a larger, megaparsec scale for Upsilon_*(M87)=8-11 (M/L_B)_solar. The cluster dark mass halo and the stellar mass in M87 have equal weight at ~1/2-3/4 effective radius.
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