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UGC - Uppsala General Catalog of Galaxies |
HEASARC Archive |
The catalog contains descriptions of the galaxies and their surrounding areas, plus conventional system classifications and position angles for flattened galaxies. Galaxy diameters on both the blue and red POSS prints are included and the classifications and descriptions are given in such a way as to provide as accurate an account as possible of the appearance of the galaxies on the prints. Only the data portion of the published UGC is included in the machine-readable version, notice. For additional details regarding the classifications, measurement of apparent magnitudes, and data content, the source reference should be consulted.
Name
The UGC source designation based on the catalog number. The galaxies are
numbered in order of their 1950 right ascension values.
UGC_Number
The catalog number of the object in the UGC.
RA
The Right Ascension of the galaxy in the selected equinox. Notice
that the RAs in the originating table were given in 1950 equatorial
coordinates to a precision of 0.1 minutes of time.
Dec
The Declination of the galaxy in the selected equinox. Notice that
the Declinations in the originating table were given in 1950 equatorial
coordinates to a precision of 1 arcminute.
LII
The Galactic Longitude of the galaxy.
BII
The Galactic Latitude of the galaxy.
Mcg
The Morphological Catalogue of Galaxies (MCG: CDS/ADC Catalog VII/62A,
Vorontsov-Velyaminov et al. 1962, 1963, 1964, 1968) designation of the galaxy,
if available, or a pseudo-MCG desgination (explained below), if not. The first
number of the designation is the Palomar Observatory Sky Survey (POSS) 6 deg
zone, from the equator +00 to the north celestial pole +15; the second number
is the POSS field along the zone, while the third number is the galaxy in this
field in the MCG. Non-MCG galaxies are assigned the number 000 in the third
position, but the first and second values are given correctly.
POSS_Field
The number of the Palomar Observatory Sky Survey (POSS) field
in which the galaxy is best visible.
Blue_Major_Axis
The major axis of the galaxy as measured on the POSS
blue print, in arcminutes. The precision of this number is typically 0.1
arcminutes, although in some cases it was only given to the nearest
arcminute in the originating catalog.
Blue_Minor_Axis
The minor axis of the galaxy as measured on the POSS
blue print, in arcminutes. The precision of this number is typically 0.01 or
0.1 arcminutes, although in some cases it was only given to the nearest
arcminute in the originating catalog.
Position_Angle
The position angle of the galaxy major axis in degrees,
measured in the conventional manner from North through East. This field is
left blank if this datum is not available.
Hubble_Type
The classification in the Hubble system or a less specific
description of the galaxy type. Notice that this is an abbreviated version
of the information available in the printed version of this catalog, which
latter should be consulted, if required. Some abbreviations are used:
Abbreviation Meaning COMP Companion DBL SYS Double System DWF Dwarf DWRF EL Dwarf Elliptical DWF PEC Dwarf Peculiar DWRF SP Dwarf Spiral DWF SYS Dwarf System DISTRBD Disturbed ERUPTVE Eruptive EX CMPT Extremely Compact PECULR Peculiar TRP SYS Triple System
Phot_Mag
The photographic magnitude of the galaxy, usually given to
a precision of 0.1 magnitudes, sometimes to only the nearest magnitude, in the
originating version of the catalog.
Radial_Velocity
The radial velocity of the galaxy in km/s relative to
the Local Group of galaxies and corrected for the solar motion
according to the relation V0 = +300 cos A, where A is the distance to the
conventional Solar apex at lI = 55 deg, bI = 0 deg, or lII = 87 deg, bII =
+1 deg. If the uncertainties in the measurements were considered too large
to make corrections meaningful, usually only the uncorrected value is given.
Red_Major_Axis
The major axis of the galaxy as measured on the POSS
red print, in arcminutes. The precision of this number is typically 0.1
arcminutes, although in some cases it was only given to the nearest
arcminute in the originating catalog.
Red_Minor_Axis
The minor axis of the galaxy as measured on the POSS
red print, in arcminutes. The precision of this number is typically 0.01 or
0.1 arcminutes, although in some cases it was only given to the nearest
arcminute in the originating catalog.
Inclination_Code
An code describing the inclination of the galaxy, measured
on a scale from 1 (face-on) to 7 (edge-on). For galaxies of high inclination,
a value is calculated from the Hubble formula n = 10(a-b)/a, where a is the
major axis and b the minor axis. The value of 7 denotes objects that are
inclined not more than a few degrees to the line of sight.
Class
The HEASARC Browse classification is derived for this database from
the hubble_type parameter.