THE ASTRONOMICAL JOURNAL    VOLUME 112, NUMBER 5, PAGE 1803     NOVEMBER 1996

              LARGE-SCALE STRUCTURE AT LOW GALACTIC LATITUDE

                             RONALD O. MARZKE

         Dominion Astrophysical Observatory, Herzberg Institute of
    Astrophysics, National Research Council of Canada, 5071 W. Saanich
                    Road, Victoria, BC V8X 4M6, Canada

                   JOHN P. HUCHRA AND MARGARET J. GELLER

      Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,
                      Cambridge, Massachusetts 02138

    We have extended the CfA Redshift Survey to low galactic latitudes to
    investigate the relation between the Great Wall in the North Galactic
    Cap and the Perseus-Pisces chain in the South Galactic Cap. We present
    redshifts for 2020 galaxies in the Catalogue of Galaxies and of
    Clusters of Galaxies (Zwicky et al. 1961-68, CGCG) in the following
    regions: 4h <= R.A. <= 8h, 17h <= Dec. <= 20h, 0 deg <= Dec. <= 45
    deg. In these regions, the redshift catalogue includes 1664 galaxies
    with B(0) <= 15.5 (of which 820 are newly measured) and is 97%
    complete. We also include redshifts for an additional 356 galaxies in
    these regions with B(0) > 15.5; of these, 148 were previously
    unmeasured. The CGCG samples the galaxy distribution down to b_(II) ~
    10 deg. In this paper, we discuss the acquisition and reduction of the
    spectra, and we examine the qualitative features of the redshift
    distribution. The Great Wall and the Perseus-Pisces chain are not
    simply connected across the Zone of Avoidance. These structures, which
    at first appear to be coherent on scales of ~100 h^(-1) Mpc or more,
    actually form the boundaries of neighboring voids of considerably
    smaller scale, approximately 50 h^(-1) Mpc. The structures delineated
    by our optically-selected sample are qualitatively similar to those
    detected by the far-infrared-selected IRAS 1.2 Jansky Survey (Fisher et
    al. 1995). Although the IRAS survey probes more deeply into the Zone of
    Avoidance, our optically-selected survey provides better sampling of
    structures at b_(II) >= 10 deg. (Copyright) 1996 American Astronomical
    Society.