Statistics – Computation
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..309f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 2, June 1990, p. 309-316.
Statistics
Computation
2
Astronomical Models, Extragalactic Radio Sources, Infrared Sources (Astronomy), Angular Distribution, Computational Astrophysics, Infrared Astronomy Satellite, Luminosity
Scientific paper
The problem of estimating the cosmic density parameter Omega0 from the angular anisotropies of differential counts of extragalactic IR sources is considered theoretically, with a focus on the need to account for source properties (e.g., the luminosity function measured at wavelength 60 microns). The derivation of the governing equations is outlined, and numerical results for realistic models of the source properties are presented in graphs. It is shown that the value of Omega0 calculated from the IRAS dipole anisotropy is too dependent on the underlying assumptions to be reliable. When higher-order harmonics are included in the analysis, the rms fluctuation in F(gamma), the source number density on the celestial sphere as a function of the angular scale, has a slope which, for all values of gamma greater than 1 deg, is significantly different from that of white noise.
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