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A Redshift Survey of IRAS Galaxies

Published online by Cambridge University Press:  03 August 2017

Michael A. Strauss  and
Marc Davis
Michael A. Strauss
Affiliation:
Astronomy and Physics Departments, University of California, Berkeley, Berkeley, California, 94720
Marc Davis
Affiliation:
Astronomy and Physics Departments, University of California, Berkeley, Berkeley, California, 94720

Abstract

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We have completed a redshift survey of approximately 2200 IRAS galaxies, flux limited at 60μ. The survey covers 76% of the sky and has a characteristic depth of ≈ 6000 km s−1, making it ideal for large scale structure studies requiring whole sky coverage. We have calculated the gravitational acceleration on us due to the inhomogeneous distribution of galaxies in the sample by summing the dipole acceleration in successive shells centered on us. The acceleration converges at ≈ 4000 km s−1 and we derive density estimates in the range 0.4 < Ω < 0.9. We discuss the various biases of the sample in detail: the paucity of elliptical galaxies, the problem of extended sources, and hysteresis, and suggest ways to accommodate them and thus decrease the uncertainty in Ω. Finally, we discuss the use of the survey to make predictions for the peculiar velocity flowfield in space.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 130: Large Scale Structures of the Universe , 1988 , pp. 191 - 201
Copyright
Copyright © Reidel 1988 

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