Astrocat Starcat Homepage


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

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