Evidence for large-scale structure on scales about 300/h MPC

Details Evidence for large-scale structure on scales about 300/h MPC Evidence for large-scale structure on scales about 300/h MPC

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249...46p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 46-61. Research supported by Min

Statistics

Computation

73

Galactic Structure, Local Group (Astronomy), Astronomical Catalogs, Computational Astrophysics, Dark Matter, Gravitational Effects, Perturbation Theory, Relic Radiation

Scientific paper

The combined Abell-ACO cluster catalog with m10 less than about 16.4 which is 80 percent redshift complete was analyzed. Taking into account different models of the extinction region the cluster dipole is found pointing within less than about 10 deg of the cosmic-microwave-background (CMB) dipole direction which indicates that clusters are tracers of mass. The dipole amplitude converges at about 150/h Mpc, within the completeness limit of the catalog. It is found that the anisotropy which is responsible for the Local Group (LG) motion with respect to the CMB rest frame extends in depth and has a scalelength of about 300/h Mpc. Most of the LG peculiar velocity is induced by matter fluctuations within about 50/h Mpc. Shapley's concentration (otherwise known as 'Giant Attractor' or 'alpha region') at a depth of about 140/h Mpc, is responsible for less than about 20 percent of the LG's peculiar velocity. Finally, using linear perturbation theory, it is found that Omega-0 is less than about 0.3.

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