The peculiar velocity field in the Hercules region

Details The peculiar velocity field in the Hercules region The peculiar velocity field in the Hercules region

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..349f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 349-364.

Astronomy and Astrophysics

Astrophysics

27

Galactic Clusters, Hubble Constant, Red Shift, Velocity Distribution, Velocity Measurement, Charge Coupled Devices, Cosmology, H Lines, Spatial Distribution, Spectral Line Width

Scientific paper

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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