Large-scale structure after COBE: Peculiar velocities and correlations of cold dark matter halos

Details Large-scale structure after COBE: Peculiar velocities and correlations of cold dark matter halos Large-scale structure after COBE: Peculiar velocities and correlations of cold dark matter halos

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431..559z&link_type=abstract

The Astrophysical Journal, vol. 431, no. 2, pt. 1, p. 559-568

Astronomy and Astrophysics

Astrophysics

80

Dark Matter, Galactic Clusters, Galactic Evolution, Halos, Red Shift, Stellar Mass, Computerized Simulation, Cosmic Background Explorer Satellite, Cosmology, Data Correlation, Many Body Problem, Spatial Distribution, Velocity Distribution

Scientific paper

Large N-body simulations on parallel supercomputers allow one to simultaneously investigate large-scale structure and the formation of galactic halos with unprecedented resolution. Our study shows that the masses as well as the spatial distribution of halos on scales of tens of megaparsecs in a cold dark matter (CDM) universe with the spectrum normalized to the anisotropies detected by Cosmic Background Explorer (COBE) is compatible with the observations. We also show that the average value of the relative pairwise velocity dispersion sigmav - used as a principal argument against COBE-normalized CDM models-is significantly lower for halos than for individual particles. When the observational methods of extracting sigmav are applied to the redshift catalogs obtained from the numerical experiments, estimates differ significantly between different observation-sized samples and overlap observational estimates obtained following the same procedure.

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