SGC (G0): Southern Galaxy Catalog (19890410)
FILE: sgc.g0 (5476 galaxies)
CONTENTS: Southern Galaxy Catalog: -90<Dec<-16
DATASET: This file is part of HyperSky dataset G-2 (G-2.1), version 19890410. Availability on HyperSky CD-ROM: Vol. 1 (1993)
DESCRIPTION: One of the major functions of the SGC is to cover the southern sky in a manner which complements the coverage of the northern sky by the Uppsala Galaxy Catalog (UGC).
This datafile is taken from a version of the SGC provided in Feb. 1989 by Dr. Harold G. Corwin of the University of Texas. The version contains all known corrections thru Nov. 1988, with the addition of later minor corrections provided in April 1989.
The SGC is an "extended subset" of the galaxies in the European Southern Observatory (ESO) catalog. In most cases the SGC catalog number matches the original ESO catalog number.
The ESO number is composed of a field number followed by the object number on that plate. For example, galaxy "545- G 31" is the 31st object on ESO field 545. In the complete ESO catalog (including more than just galaxies) this number would be simply "545- 31". In some cases only a field number is provided. These are additions to the original ESO catalog made by Harold Corwin et al; and are what make the SGC galaxies more than just a subset of the original ESO galaxies. These additional galaxies are named only by the ESO field number, and not necessarily unique: for example, several atlas galaxies have SGC number 606, and are distinquished only by their positions.
DATA: The HyperSky datafile contains the following data from the catalog:
MAG: Magnitudes were not given in the SGC. Those few included are taken from alternate catalog sources. This limits somewhat the usefulness of the data as a "stand_alone" file. Nevertheless, the data still provides a valuable cross-reference when used with other files such as the RC2. WARNING! Since most magnitudes are not provided, essentially all galaxies in this file will disappear if HyperSky's faint limiting faint galaxy magnitude is raised above its default. This is because HyperSky assigns the default faint limit to any galaxy without a magnitude.
IDENTIFICATION: The SGC identification number as discussed above.
COMMENTS: The comment line contains the following additional information, provided if available for each galaxy:
* Revised morphological type, following the format described in the RC2 manual page supplied with HyperSky. See that page for details.
* Alternate identifications.