Abstract
view Abstract Citations (144) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Biased Cold Dark Matter Theory: Trouble from Rich Clusters? Evrard, August E. Abstract 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 ~ 0.5 indicate an alarmingly low value of b for the theory. If taken at face value, the observations imply an unbiased model, b ~ 1. However, this value of b predicts roughly 10 times as many low-redshift clusters (z < 0.1) as are observed. The low-redshift data favor values in the range b ~ 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. Publication: The Astrophysical Journal Pub Date: June 1989 DOI: 10.1086/185460 Bibcode: 1989ApJ...341L..71E Keywords: Cosmology; Dark Matter; Open Clusters; Universe; Astronomical Models; Cosmic X Rays; Red Shift; Sky Surveys (Astronomy); Astrophysics; CLUSTERS: OPEN; COSMOLOGY full text sources ADS | data products SIMBAD (5) NED (3)
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
