A survey of galaxy redshifts from low-resolution slitless spectra: suggestion of large-scale structures at z 0.1

We have conducted a galaxy survey based on low-resolution slitless spectrataken from the automated CFHT-Laval survey. We present redshift distributionsfor 522 galaxies distributed in 4 distinct regions of the sky. Redshifts aredetermined from the shifted positions of the 4000 A. stellar break using anautomated break-finding algorithm. The redshifts so obtained have a precisionof < 3000 km s-1, good enough to trace the large-scale distribution ofgalaxies. The most striking feature of the survey is an apparent excess ofgalaxies at z ~ 0.1 in 8 of the 10 fields probed. Although the statisticalsignificance of the peaks appears marginal (~ 2.5s per field) after taken inaccount the small-scale galaxy clustering, the peaks may nevertheless revealthe existence of large-scale structures at z ~ 0.1, indicating that the knownlarge structures in the local universe are not unusual.Comment: 28 pages + 4 figures, uuencoded-compressed-Postscript, EFB0829