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Title:
The peculiar velocity field in the Hercules region
Authors:
Freudling, Wolfram; Martel, Hugo; Haynes, Martha P.
Affiliation:
AA(Arecibo Observatory, PR), AB(Cornell University, Ithaca, NY; Montreal, Universite, Montreal, Canada), AC(Cornell University, Ithaca, NY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 349-364. (ApJ Homepage)
Publication Date:
08/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Galactic Clusters, Hubble Constant, Red Shift, Velocity Distribution, Velocity Measurement, Charge Coupled Devices, Cosmology, H Lines, Spatial Distribution, Spectral Line Width
DOI:
10.1086/170366
Bibliographic Code:
1991ApJ...377..349F

Abstract

The three-dimensional distribution of galaxies in the Hercules region is studied, using the Tully-Fisher relation to search for deviations from a smooth Hubble flow. Magnitudes and inclinations are given for 86 galaxies based on new I-band CCD images, and redshift-independent distances are estimated and used to estimate peculiar velocities of the galaxies. The gravitationally induced deviations from a smooth Hubble flow is modeled using a sample of 2165 galaxies for which only redshifts are known. A comparison of predicted velocities with redshift-independent distances indicates a value of 0.7 for the density parameter Omega.

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