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Massive compact halo objects viewed from a cosmological perspective contribution to the baryonic mass density of the universe.pdf
22!3
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__ NewAstronomy
I!3
ELXWIER New Astronomy 3 (1998) 347-361
Massive compact halo objects
viewed from a cosmological perspective:
contribution to the baryonic mass density of the universe
Brian D. Fields”“, Katherine Freeseb’2, David S. Graft”‘”
“Universir?, of Minnesota, School of Physics and Astronomy, Minneqolis, Minnesota 55455, USA
“University of Michigan, Depurtment ofPhysics. Ann Arbor, Michigan 48109-1120. USA
‘DAPNIAISPP. CEA Saclay. 91191 Gif_sur-Yvette cedex. France
Received 20 January 1998; accepted 8 April 1998
Communicated by Robert P. Kirshner
Abstract
We estimate the contribution of massive compact halo objects (MACHOs) and their stellar progenitors to the mass density
of the Universe. If the MACHOs that have been detected reside in the halo of our Galaxy, then a simple extrapolation of the
Galactic population (out to 50 kpc) of MACHOs to cosmic scales gives a cosmic density pMACHO= (l-5) X
lO’hM,MpcY’, which in terms of the critical density corresponds to a,,,,, = (0.0036-O.O17)h-‘. Should the MACHO
halo extend out to much further than 50 kpc, then ,,,,,, would only be larger. Such a mass density is compara
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