THE ASTRONOMICAL JOURNAL       VOLUME 105, NUMBER 4, PAGE 1251       APRIL 1993

     A SURVEY OF THE PISCES-PERSEUS SUPERCLUSTER. V. THE DECLINATION STRIP
            +33.5 DEG TO +39.5 DEG AND THE MAIN SUPERCLUSTER RIDGE

                                  GARY WEGNER

       Department of Physics and Astronomy, Dartmouth College, Hanover,
                              New Hampshire 03755

                   MARTHA P. HAYNES AND RICCARDO GIOVANELLI

National Astronomy and Ionosphere Center and Department of Astronomy, Cornell
                      University, Ithaca, New York 14853


                                   ABSTRACT

    Measurements of 544 radial velocities, 229 optical and 315 in the 21 cm
    H I line, are presented for galaxies, mostly in the declination strip
    +33.5 deg < Dec < +39.5 deg in the region of the Pisces-Perseus
    supercluster.  These are combined with other available data to
    investigate the linear structure identified as the main supercluster
    ridge.  The main ridge of the supercluster extends at least 50 h^-1 Mpc
    before it disappears into the zone of avoidance east of Perseus.
    Confinement both on the plane of the sky and in the velocity dimension
    imply an axial ratio of greater than ten to one and an inclination with
    respect to the plane of the sky of less than about 12 degrees.  The
    smoothed volume density contrast over the whole ridge averages more
    than a factor of 6 relative to the average density derived for the
    whole sample.  The relative proximity, low inclination to the plane of
    the sky, and high contrast relative to the foreground and background,
    help to make the Pisces-Perseus filament one of the most prominent
    features in the extragalactic sky on large scales.