A redshift survey of IRAS galaxies. IV - The galaxy distribution and the inferred density field

Details A redshift survey of IRAS galaxies. IV - The galaxy distribution and the inferred density field A redshift survey of IRAS galaxies. IV - The galaxy distribution and the inferred density field

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..421s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 421-444. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

132

Galactic Clusters, Infrared Astronomy Satellite, Red Shift, Sky Surveys (Astronomy), Space Density, Astrometry, Density Distribution, Monte Carlo Method

Scientific paper

A full-sky flux-limited redshift survey of galaxies detected by the IRAS is used to characterize the density distribution of galaxies to characterize the density distribution of galaxies to a redshift of 8000 km/s. The galaxy distribution is dominated by the Hydra-Centaurus-Pavo-Indus supercluster and the Perseus-Pisces supercluster. Monte Carlo experiments show that the fractional density field can be determined to an accuracy of 0.3-0.4 of the mean density over most of the volume to 8000 km/s. A detailed comparison of the IRAS density distribution with that inferred from redshift surveys of optically selected samples of galaxies shows that the IRAS density field agrees well with that defined by the optically selected Center for Astrophysics redshift survey, except within the densest regions of the richest clusters. It is concluded that the optical and IRAS samples are consistent with those drawn from the same density field on scales larger than about 500 km/s, and that on smaller scales the optical surveys show greater clustering, an effect not dominated by the observed IRAS deficiencies in clusters.

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