Pairwise Velocity Distribution of Galaxies in the Las Campanas Survey
Abstract
We present a novel measurement of the pairwise peculiar velocity distribution function of galaxies on scales r<3200 km/sec in the Las Campanas Redshift Survey. The distribution is well described by a scaleindependent exponential with a width tau where sigma =\sqrt{2} tau=363 km/sec. The signal is very stable. Results from the sum of Northern and Southern sets of slices agree within +/ 13 km/sec and the fluctuations among the six individual survey slices vary as +/ 44 km/sec. The distribution was determined using a Fourierspace deconvolution of the redshiftspace distortions in the correlation function. This technique is insensitive to the effect of rich clusters in the survey and recovers the entire distribution function rather than just its second moment. Taken together with the large effective volume of the survey $6.0\times10^6$ Mpc$^3$, we believe th is to be a definitive result for $r$band selected galaxies with absolute magnitudes 18.5 <M_r<22.5 and z<0.2.
 Publication:

Large Scale Structure: Tracks and Traces
 Pub Date:
 1998
 Bibcode:
 1998lsst.conf..111S