Statistics – Computation
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.234..677l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 234, Oct. 1, 1988, p. 677-701.
Statistics
Computation
95
Background Radiation, Dipole Moments, Infrared Astronomy Satellite, Local Group (Astronomy), Microwave Frequencies, Astronomical Catalogs, Computational Astrophysics
Scientific paper
The authors study the relation between the peculiar acceleration of the Local Group and the surface brightness dipole moments of all-sky optical and IRAS samples. Their revised optical dipole lies within 7° of the direction of the Local Group's motion through the Microwave Background Radiation (MBR). The directions of the optical, IRAS and MBR dipoles are all consistent with each other. A simple 'shell model', fitted to the variation of the dipoles as a function of flux, suggests that the dipoles arise from galaxies whose recession velocities are smaller than 4000 km s-1. The authors find a high Ω0 value for the IRAS sample and a low one for the optical sample. These results may be reconciled if the optical galaxy distribution is more biased relative to the matter distribution than the IRAS galaxy distribution.
Lahav Ofer
Lynden-Bell Donald
Rowan-Robinson Michael
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