The Bulk Motion of FGC Galaxies on Scales of 100 Mpc

Details The Bulk Motion of FGC Galaxies on Scales of 100 Mpc The Bulk Motion of FGC Galaxies on Scales of 100 Mpc

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000arep...44..150k&link_type=abstract

Astronomy Reports, Volume 44, Issue 3, March 2000, pp.150-160

Astronomy and Astrophysics

Astronomy

12

Scientific paper

Large-scale streaming is analyzed using a sample of 983 thin, edge-on galaxies from the FGC catalog with radial velocities cz<18000 km s-1. The catalog covers the entire sky and contains galaxies with apparent axial ratios a/b>7 and angular diameters a>0.6 arcmin. The distances to the galaxies were determined using a multi-parameter “rotation amplitude-linear diameter” relation, which is similar to the Tully-Fisher relation and takes into account surface brightness, morphological type, and other global parameters. The bulk motion of the galaxy sample with respect to the frame of the microwave background radiation can be described by a dipole solution with amplitude V B =300±75 km s-1 in the direction (l=328°, b=+7°)±15°. The apex parameters for the FGC galaxies agree well with the amplitude and direction of the bulk motion for the Mark III compiled catalog, although the two samples have no objects in common. The dipole solution provides only a rough approximation to the smoothed peculiar-velocity field of the FGC galaxies. Areas of maxima and minima on the V pec map are not correlated with the locations of known nearby clusters and voids. A comparison of nearby and distant subsamples shows that the amplitude of the bulk motion with respect to the 3K reference frame does not decrease with distance. The observed large-scale galaxy streaming could be due to the Shapley concentration of rich clusters (311°, +30°), which is located within 2σ of the apex.

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