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Possible Constituents of Halos

Published online by Cambridge University Press:  04 August 2017

Martin J. Rees
Martin J. Rees*
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, United Kingdom

Abstract

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There still seem to be three serious contenders for the dark matter in galactic halos and groups of galaxies: (i) very low mass stars, (ii) black hole remnants of very massive stars or (iii) some species of particle (e.g. axions, photinos, etc.) surviving from the big bang. There are genuine prospects of detecting individual objects in all three of these categories, and thereby narrowing down the present range of options. If the Universe has the critical density (Ω = 1), rather than the lower value (Ω = 0.1–0.2) inferred from dynamical evidence, then the galaxies must be more clustered than the overall distribution even on scales 10–20 Mpc. “Biased” galaxy formation could account for this.

Type
Review Paper
Information
Symposium - International Astronomical Union , Volume 117: Dark Matter in the Universe , 1987 , pp. 395 - 409
Copyright
Copyright © Reidel 1987 

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