Abstract
view Abstract Citations (61) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Abundance of Moderate-Redshift Clusters in the Cold Plus Hot Dark Matter Model Jing, Yi-Peng ; Fang, Li-Zhi Abstract Using a particle-particle/particle-mesh simulation which accurately treats the density evolution of two components of dark matter, we study the evolution of clusters in the cold plus hot dark matter (CHDM) model. The mass function, the velocity dispersion function, and the temperature function of clusters are calculated for four different epochs of z <= 0.5. We also use the simulation data to test the Press-Schechter expression of the halo abundance as a function of the velocity dispersion σnu_. The model predictions are in good agreement with the observational data of local cluster abundances (z = 0). We also tentatively compare the model with the Gunn and his collaborators' observation of rich clusters at z ~ 0.8 and with the X-ray luminous clusters at z ~ 0.5 of the Einstein Extended Medium Sensitivity Survey. The important feature of the model is the rapid formation of clusters in the near past: the abundances of clusters of σnu_ => 700 km s^- 1^ and of σnu_ >= 1200 km s^-1^ at z = 0.5 are only 1/4 and 1/10, respectively, of the present values (z = 0). Ongoing ROSAT and AXAF surveys of distant clusters will provide sensitive tests to the model. The abundance of clusters at z~0.5 would also be a good discriminator between the CHDM model and a low-density flat CDM model, both of which show very similar clustering properties at z = 0. Publication: The Astrophysical Journal Pub Date: September 1994 DOI: 10.1086/174582 arXiv: arXiv:astro-ph/9403012 Bibcode: 1994ApJ...432..438J Keywords: Abundance; Astronomical Models; Dark Matter; Galactic Clusters; Galactic Evolution; Galactic Halos; Many Body Problem; Cosmology; Quadrupoles; Red Shift; Universe; Astrophysics; COSMOLOGY: DARK MATTER; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE; COSMOLOGY: THEORY; GALAXIES: CLUSTERING; GALAXIES: EVOLUTION; Astrophysics E-Print: 21 pages + 6 figures (uuencoded version of the PS files), Steward Preprints No. 1184 full text sources arXiv | ADS |
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