Abundance of moderate redshift clusters in the cold + hot dark matter model
Mar 11, 199427 pages
Published in:
- Astrophys.J. 432 (1994) 438
e-Print:
- astro-ph/9403012 [astro-ph]
DOI:
Report number:
- STEWARD-1184
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Abstract: (arXiv)
Using a set of \pppm simulation which accurately treats the density evolution of two components of dark matter, we study the evolution of clusters in the Cold + 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 . We also use the simulation data to test the Press-Schechter expression of the halo abundance as a function of the velocity dispersion . The model predictions are in good agreement with the observational data of local cluster abundances (). We also tentatively compare the model with the Gunn and his collaborators' observation of rich clusters at and with the x-ray luminous clusters at of the {\it 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 \sigma_v\ge 700\kms and of \sigma_v\ge 1200 \kms at are only 1/4 and 1/10 respectively of the present values (). Ongoing ROSAT and AXAF surveys of distant clusters will provide sensitive tests to the model. The abundance of clusters at 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 .References(31)
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