Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...101...79d&link_type=abstract
Astronomy and Astrophysics, Vol.101, P. 79, 1981
Astronomy and Astrophysics
Astrophysics
31
Scientific paper
The damping that adiabatic density perturbations undergo prior to and during the recombination epoch can produce a secondary peak in their two point, spatial, correlation function. It may then show up in the angle-averaged density profiles around real high density peaks. It is expected to appear at the same time in the non-linear regime of rich clusters of galaxies (length scale of a few Mpc) and in the linear regime of extended superclusters (length scale of a few tens of Mpc). Such peaks are tentatively identified in the observed spatial correlation function of galaxies and in the Virgo-centric density profile. The adiabatic component is found to be relatively important on fitting a theoretical model in which the initial spectrum is a combination of adiabatic and isothermal powerlaws. The power indices are found to be limited by nα ≧ -1 and nb = ≧ 0, respectively. By matching the peaks from the two length scales we obtain Ω0 ˜ 0.1 and MD ˜ 2 1014 Msun h-175 for the damping scale. It is proposed that the structure in the Universe evolves according to a script which is a combination of the hierarchical clustering theory and the "pancake" theory.
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