Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341l..71e&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 341, June 15, 1989, p. L71-L74. Research supported by the Univers
Astronomy and Astrophysics
Astronomy
125
Cosmology, Dark Matter, Open Clusters, Universe, Astronomical Models, Cosmic X Rays, Red Shift, Sky Surveys (Astronomy)
Scientific paper
The expected population of rich clusters in a cold dark matter (CDM)-dominated universe is extremely sensitive to the spectrum normalization, the inverse of which defines the bias parameter b. Recent observations of three high-velocity dispersion clusters at redshifts z roughly 0.5 indicate an alarmingly low value of b for the theory. If taken at face value, the observations imply an unbiased model, b about 1. However, this value of b predicts roughly 10 times as many low-redshift clusters as are observed. The low-redshift data favor values in the range b about 1.5-1.9. It is argued that poor statistics and the uncertainty in recovering intrinsic velocity dispersions from redshift measurements preclude a reliable determination of b at present. A survey of cluster X-ray temperatures complete to moderate redshifts would prove invaluable in deciding this issue.
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