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RC3: third reference catalogue of bright galaxies
Contents
Table name: RC3
Records: 23024
Spectral Band: Uband,Bband,Vband,OPT,Colour Index
Kind of Object: BrightGalaxy
Mode: 2DPhotometry
PreView:
Coordinates: J2000
Reference
- de Vaucouleur,G., de Vaucouleurs,A., Corwin, Jr., H.G., Buta,R.J.,
Paturel,G., Fouque,P.: Third reference catalogue of bright galaxies,
1991, Springer-Verlag New York, Inc.
Description
The catalogue is an good copy of the printed version. The main differences
are the (+/-) sign in the paper copy which is replaced by the standard ascii
character "@".
Fields
Name Meaning
ra right ascension for the equinox 2000.0 processed from the
1950.0 position (see down) given to 0.1 second of time
when available, and to 0.1 minute of time otherwise.
dec right ascension for the equinox 2000.0 processed from the
1950.0 position (see down) given to 1 arcsec when
available, and to 1 arcmin otherwise.
lii Galactic longitude computed from ra and dec
bii Galactic longitude computed from ra and dec
The precision of lii and bii(though depending on the
precision of ra and dec) is better than that in l and b
l Galactic longitude in the IAU 1958 system, to deg 0.01
b Galactic latitude in the IAU 1958 system, to deg 0.01
sl Supergalactic longitude, to deg 0.01
sb Supergalactic latitude, to deg 0.01
ra_ori Right ascension for the equinox 1950.0
dec_ori Declination for the equinox 1950.0
Names = commonly used designations for the galaxies
name1 Names (e.g. LMC, SMC) or NGC and IC designations
name2 UGC (Nilson `73), ESO (Lauberts `82), MCG
(Vorontsov-Veljaminov et al. `62-`74), UGCA (Nilson `74),
CGCG (Zwicky et al. `61-`68) designations, given in that
order of preference. MCG designations not listed here are
given in UGC and ESO.
name3 Other common designations.
PGC Paturel et al. `89a,b designation.
Types and Luminosity Classes
type Mean revised morphological type in the RC2 system, coded
as in RC2
sT_nL Sources of revised type estimates and number of luminosity
class estimates
T Mean numerical index of stage along the Hubble sequence in
RC2 system
T_u T mean error
L Mean numerical luminosity class in RC2 system.
L_u L mean error
Optical Diameters and Axis Ratios
logD25 mean decimal logarithm of the ratio of the major isophotal
diameter, D25, to the minor isophotal diameter, d25,
measured at or reduced to the surface brightness level (mu
)_(bet) = 25.0 B-m/ss , as explained in Section 3.4.a
logD25_u Mean error on logD25
logR25 Mean decimal logarithm of the ratio D25/d25 measured at or
reduced to the surface brightness level (mu)_(bet) = 25.0
B-m/ss, as explained in Section 3.4.b
logR25_u Mean error on logR25
logAe Decimal logarithm of the apparent diameter (in 0.1 arcmin)
of the "effective aperture", the circle centered on the
nucleus within which one-half of the total B-band flux if
emitted
logAe_u logAe mean error
logD0 Decimal logarithm of the isophotal major diameter
corrected to face-on (i=0 deg.), and corrected for
galactic extinction to Ag = 0, but not for redshift.
Major Axis Position Angle, Galactic and Internal Extinctions
posan Position angle, measured in degrees from north through
east (all <180 deg.), taken available from UGC,ESO and
ESGC (and in few cases from HI data).
Ag Galactic extinction in B-band magnitudes, calculated
following Burstein and Heiles (1978a,1982,1984)
Ai Internal extinction in B-band magnitudes (for correction
to face-on), calculated from logR and T.
A21 HI line self-absorption in magnitudes (for correction to
face-on), calculated from logR and T>=1
Optical and Infrared Magnitudes
btot Total (asymptotic) magnitude in the B systemderived by
extrapolation from photoelectric aperture-magnitude data
and from surface photometry with photoelectric zero point.
btot_u btot mean error
mb Photographic magnitude
mb_u mb mean error
mfir far-infrared magnitude calculated from
mfir=-20.0-2.5*log(FIR) where FIR is the far infrared
continuum flux measured at 60 and 100 microns as listed in
the IRAS_PSC (Point Source Catalog) (1987)
b0t Total "face-on" magnitude corrected for galactic and
internal extinction, and for redshift
Total Color Indices
bmv_t Total color index in the Johnson B-V system
bmv_tu bmv mean error
umb_t Total color index in the Johnson U-B system
umb_tu umb mean error
bmv_0t Total (B-V) color index corrected for galactic and
internal extinction, and for redshift
umb_0t Total (U-B) color index corrected for galactic and
internal extinction, and for redshift
Effective Color Indices and B-band Surface Brightness
bmv_e Mean (B-V) color index within the effective aperture Ae
bmv_eu bmv_e mean error
umb_e Mean (U-B) color index within the effective aperture Ae
umb_eu umb_e mean error
m_e Mean B-band surface brightness in magnitudes per square
arcmin (B-m)/sm within the effective aperture Ae,
calculated from the relation m_e = btot + 0.75 + 5*logAe -
5.26. this m_e is statistically related to the effective
mean surface brightness with which it coincides when
logR=0 (i = 0 deg.)
m_eu Mean error of m_e
m_25 Mean surface brightness in magnitudes per square arcmin
within the (mu)_(bet) = 25.0 B-m/ss elliptical isophote of
major axis logD25 and axis ratio logR25, defined as in RC2
by:
m_25 = btot + (DEL)m25 + 5 logD25 -2.5 logR25 -5.26
where (DEL)m25 = 2.5 log (Lt/L25) = B25 - btot
is the magnitude increment contributed by the outer
regions of a galaxy fainter than (mu)_(bet) = 25.0 B-m/ss.
m_25u Mean error on m_25
21-cm Magnitude and Linewidths, Hydrogen Index
m21 21 cm emission line magnitude defined by
m21 = 21.6 - 2.5 log S_H
where S_H is the measured neutral hydrogen flux density in
units of 10^-24 Wm^-2
m21_u m21 mean error
w20 Neutral hydrogen line full width (in km/s) measured
at the 20 % level (I_20/I_max)
w20_u Mean error on w20
w50 Neutral hydrogen line full width (in km/s) measured
at the 50 % level (I_50/I_max)
w50_u Mean error on w50
HI Corrected neutral hydrogen index, which is the difference
(m21 - btot)_0
between the corrected (face-on) 21cm emission line
magnitude and
the similarly corrected magnitude in the btot system.
Radial Velocities
v21 = cz is the mean heliocentric radial velocity in km/s
derived from neutral hydrogen observations.
v21_u Mean error on v21
vopt = cz is the mean heliocentric radial velocity in km/s
derived from optical observations.
vopt_u Mean error on vopt
vgsr The weighted mean of the neutral hydrogen and optical
velocities, corrected to the "Galactic standard of rest"
v3K The weighted mean velocity corrected to the reference
frame defined by the 3^oK microwave background radiation