Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391...16s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 16-33. Research supported by NSF.
Astronomy and Astrophysics
Astrophysics
34
Astronomical Models, Brightness Distribution, Galactic Clusters, Charge Coupled Devices, Galactic Mass, Relic Radiation
Scientific paper
The paper uses the observed distribution of light in the Local Supercluster to determine the expected velocities of galaxies if the assumptions are valid that nonexpansion motions are generated by gravitational perturbations and that mass is distributed like the light. The assumption that gravitational perturbations must dominate the generation of peculiar velocities is substantiated, and M/L of about 144h(Omega)00.4 is found. It is concluded that the clumped mass is clustered on scales of less than 1 Mpc with M/L of about 100 and that an insignificant amount of additional mass is clustered on scales between 1 Mpc and about 20 Mpc. The model provides a natural description of the 'local velocity anomaly'. The chi-squared fit for the preferred model results in an equivalent rms uncertainty in the difference between observed and model velocities of 18 percent of the observed velocity.
Pierce Michael J.
Shaya Edward J.
Tully Brent R.
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