Peculiar velocities of field spiral galaxies near and beyond the Great Attractor

Details Peculiar velocities of field spiral galaxies near and beyond the Great Attractor Peculiar velocities of field spiral galaxies near and beyond the Great Attractor

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388..253b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 388, April 1, 1992, p. 253-267. Research supported by Dudley Observatory an

Astronomy and Astrophysics

Astrophysics

20

Astrometry, Celestial Mechanics, Red Shift, Spiral Galaxies, Stellar Motions, Astronomical Models, Galactic Clusters, Galactic Structure

Scientific paper

Peculiar velocities for a sample of 48 late-type spiral galaxies which are located in the general vicinity of the Great Attractor (GA) are measured. Relative distances are derived using the I-band Tully-Fisher relation. The existence of positive velocity residuals, with amplitude 500-2000 km/s in the Hydra-Centaurus region, is confirmed for galaxies located at kinematic distances of 20-30 Mpc. Beyond 45 Mpc, there is a very weak signal of negative velocity residuals whose amplitude is very sensitive to the form of the Malmquist correction. However, positive velocity residuals can be detected in galaxies with distances as large as 80 Mpc. The origin of these motions is tested by the use of a nonlinear spherical infall model which predicts the position of the caustic surface as a function of distance from the GA. All available velocities are used to search for the caustics in redshift space.

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