Structure formation in a universe with cold plus hot dark matter

Abstract

view Abstract Citations (87) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Structure Formation in a Universe with Cold Plus Hot Dark Matter van Dalen, Anthony ; Schaefer, Robert K. Abstract We examine the effect of a small admixture of hot dark matter (HDM) to the "standard" cold dark matter (CDM) model for galaxy formation. With equal amounts of HDM and CDM the growth of galactic scale density peaks in the CDM component is highly damped and galaxy formation is problematic, as has been discussed elsewhere. However, if the HDM contribution is <~ 30% then the damping is not so severe and galaxies can still form by a reasonable redshift. Further, with this amount of HDM agreement with large-scale structure observations are greatly improved over that of pure CDM. In this paper we demonstrate this by comparing the predictions of CDM and cold plus hot dark matter (CPHDM) models with the most recent observations. We will consider galactic cluster correlations, large-scale peculiar velocity flows, observationally derived power spectra, and the likelihood of finding a Great Attractor-sized object. Galaxy formation is still a computationally subtle issue, but we make some preliminary observations concerning two-point correlations and formation times. Publication: The Astrophysical Journal Pub Date: October 1992 DOI: 10.1086/171832 Bibcode: 1992ApJ...398...33V Keywords: Dark Matter; Galactic Evolution; Universe; Astronomical Models; Power Spectra; Red Shift; Transfer Functions; Astrophysics; COSMOLOGY: DARK MATTER; GALAXIES: CLUSTERING; COSMOLOGY: LARGE-SCALE STRUCTURE OF UNIVERSE full text sources ADS |