The updated Zwicky Catalog (UZC)

The Zwicky Catalog of galaxies (ZC), with m(Zw) less than or equal to 15.5, has been the basis for the Center for Astrophysics (CfA) redshift surveys. To date, analyses of the ZC and redshift surveys based on it have relied o n heterogeneous sets of galaxy coordinates and redshifts. Here we correct s ome of the inadequacies of previous catalogs by providing (1) coordinates w ith less than or similar to 2 " errors for all of the 19,369 catalog galaxi es, (2) homogeneously estimated redshifts for the majority (98%) of the dat a taken at the CfA (14,632 spectral, and (3) an estimate of the remaining " blunder" rate for both the CfA redshifts and for those compiled from the li terature. For the reanalyzed CfA data we include a calibrated, uniformly de termined error and an indication of the presence of emission lines in each spectrum.,We provide redshifts for 7257 galaxies in the CfA2 redshift surve y not previously published; for another 5625 CfA redshifts we list the reme asured or uniformly rereduced value. Among our new measurements, 1807 are m embers of UZC "multiplets" associated with the original Zwicky catalog posi tion in the coordinate range where the catalog is 98% complete. These multi plets provide new candidates for examination of tidal interactions among ga laxies. All of the new redshifts correspond to UZC galaxies with properties recorded in the CfA redshift compilation known as ZCAT. About 1000 of our new measurements were motivated either by inadequate signal-to-noise in the original spectrum or by an: ambiguous identification of the galaxy associa ted with a ZCAT redshift. The redshift catalog we include here is similar t o 96% complete to m(Zw) less than or equal to 15.5 and similar to 98% compl ete (12,925 galaxies out of a total of 13,150) for the right ascension rang es 20(h) greater than or equal to alpha(1950) less than or equal to 14(h) a nd 8(h) greater than or equal to alpha(1950) less than or equal to 17(h) an d declination range -2.degrees 5 less than or equal to delta(1950) greater than or equal to 50 degrees. This more complete region includes all of the CfA2 survey as analyzed to date. The Great Wall structure persists througho ut the northern survey region.