TABLE  RC3

The main PhotoObj table for the RC3 catalog

The main PhotoObj table for the RC3 catalog

nametypelengthunitucddescription
namevarchar20 ID_AREAPrimary name
aliasesvarchar20  Other names
PGC_namevarchar10  PGC (Paturel et al. 1989a,b) designation
rafloat8degreesPOS_EQ_RARight Ascension (J2000)
decfloat8degreesPOS_EQ_DECDeclination (J2000)
good_positionint4  The values of ra/dec are good to 0.1 sec time, 1 asec (otherwise, 0.1 min time, 1 amin)
galactic_lfloat8degreesPOS_EQ_RAGalactic longitude in the IAU 1958 system (Blaauw et al. 1960); good to 0.01 degrees
galactic_bfloat8degreesPOS_EQ_DECGalactic latitude in the IAU 1958 system (Blaauw et al. 1960); good to 0.01 degrees
superGalactic_lfloat8degreesPOS_EQ_RASupergalactic longitude in the RC2 system; good to 0.01 degrees
superGalactic_bfloat8degreesPOS_EQ_DECSupergalactic latitude in the RC2 system; good to 0.01 degrees
PosAnglefloat8degrees position angle, measured in degrees from north through east (all p.a. < 180 degrees), taken when available from UGC, ESO, and ESGC (and in a few cases from HI data).
rc2_typechar7  mean revised morphological type in the RC2 system, coded as in RC2
rc2_typeSourcechar6  Sources of revised morphological type estimate
T_typefloat8  Mean numerical index of stage along the Hubble sequence in the RC2 system
T_typeErrfloat8  Error in T_type
LC_rc2float8  Mean numerical luminosity class in the RC2 system
LC_rc2Errfloat8  Error in LC_rc2
n_Lfloat8  Number of luminosity class estimates
B_Tfloat8magnitudes Total (asymptotic) magnitude in the B system, derived by extrapolation from photoelectric aperture-magnitude data, B_T^A, and from surface photometry with photoelectric zero point, B_T^S
B_TErrfloat8magnitudes Error in B_T
B_Tsourcechar1  M when B_T is the weighted mean of B_T^A and B_T^S; V when B_T is a V-band magnitude rather than a B-band magnitude; v when the nucleus of the galaxy is variable; * when deriving B_T^A would have required an extrapolation in excess of 0.75 mag.
B_T0float8magnitudes total ``face-on'' magnitude corrected for Galactic and internal extinction, and for redshift
M_Bfloat8magnitudes Photographic magnitude from Ames (1930), Shapley and Ames (1932), CGCG, Buta and Corwin (1986), and/or Lauberts and Valentijn (1989) reduced to the B_T system
M_BErrfloat8magnitudes Error in M_B
M_FIRfloat8magnitudes Far-infrared magnitude calculated from M_FIR = - 20.0 - 2.5 log_10(FIR), where FIR is the far infrared continuum flux measured at 60 and 100 microns as listed in the IRAS Point Source Catalog (1987). For galaxies larger than 8 arcmin in RC2 and for the Virgo cluster area, resolved by the IRAS beam, integrated fluxes are taken from Rice et al. (1988) or Helou et al. (1988)
M_21cmfloat8magnitudes 21-cm emission line magnitude, and its mean error, defined by m_21 = 21.6 - 2.5 log(S_H), where S_H is the measured neutral hydrogen flux density in units of 10^-24 W/m^2
M_21cmErrfloat8magnitudes Error in M_21cm
BV_Tfloat8magnitudes Total (asymptotic) color index in the Johnson B-V system, derived by extrapolation from photoelectric color-aperture data, and/or from surface photometry with photoelectric zero point
BV_TErrfloat8magnitudes Error in BV_T
BV_T0float8magnitudes Total B-V color index corrected for Galactic and internal extinction, and for redshift
BV_efloat8magnitudes Mean B-V color index within the effective aperture A_e, derived by interpolation from photoelectric color-aperture data
BV_eErrfloat8magnitudes Error in BV_e
UB_Tfloat8magnitudes Total (asymptotic) color index in the Johnson U-B system, derived by extrapolation from photoelectric color-aperture data, and/or from surface photometry with photoelectric zero point
UB_TErrfloat8magnitudes Error in UB_T
UB_T0float8magnitudes Total U-B color index corrected for Galactic and internal extinction, and for redshift
UB_efloat8magnitudes Mean U-B color index, and its mean error, within the effective aperture A_e, derived by interpolation from photoelectric color-aperture data
UB_eErrfloat8magnitudes Error in UB_e
lgD_25float8lg(0.1 arcmin) mean decimal logarithm of the apparent major isophotal diameter measured at or reduced to surface brightness level mu_B = 25.0 B-mag/arcsec^2
lgD_25Errfloat80.1 arcmin Error in lgD_25
lgD_0float8lg(0.1 arcmin)? decimal logarithm of the isophotal major diameter corrected to ``face-on'' (inclination = 0 degrees), and corrected for Galactic extinction to A_g = 0, but not for redshift
lgR_25float8  Mean decimal logarithm of the ratio of the major isophotal diameter, D_25, to the minor isophotal diameter, d_25, measured at or reduced to the surface brightness level mu_B = 25.0 B-mag/arcsec^2
lgR_25Errfloat8  Error in lgR_25
logA_efloat8  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 is emitted
logA_eErrfloat8  Error in logA_e
m_efloat8magnitudes mean B-band surface brightness in magnitudes per square arcmin (B-mag/arcmin^2) within the effective aperture A_e, as given by the relation m'_e = B_T + 0.75 + 5logA_e - 5.26. m'_e is statistically related to the effective mean surface brightness, mu'_e (RC2, p. 31; Olson and de Vaucouleurs 1981), with which it coincides when log R = 0 (i = 0 degrees)
m_eErrfloat8magnitudes Error in m_e
m_25float8magnitudes/arcmin^2 m'_25 = the mean surface brightness in B-mag/arcmin^2 within the mu_B = 25.0 B-mag/arcsec^2 elliptical isophote of major axis D_25 and axis ratio R_25, defined as in RC2 (Equation 21) by: m'_25 = B_T + Delta m_25 + 5 logD_25 - 2.5 logR_25 - - 5.26, where Delta m_25 = 2.5 log(L_T/L_D_25) = B_25 - B_T is the magnitude increment contributed by the outer regions of a galaxy fainter than mu_B = 25.0 B-mag/arcsec^2
m_25Errfloat8magnitudes/arcmin^2 Error in m_25
A_Bfloat8magnitudes Galactic extinction in B-band magnitudes, calculated following Burstein and Heiles (1978a,b, 1982, 1984)
A_HI_selffloat8magnitudes HI line self-absorption in magnitudes (for correction to face-on), calculated from logR and T >= 1
A_B_intfloat8magnitudes internal extinction in B-band magnitudes (for correction to face-on), calculated from logR and T
W_20float8km/s Neutral hydrogen line full width measured at the 20% level (I_20/I_max)
W_20Errfloat8km/s Error in W_20
W_50float8km/s Neutral hydrogen line full width measured at the 50% level (I_50/I_max)
W_50Errfloat8km/s Error in W_50
HIfloat8magnitudes corrected neutral hydrogen index, which is the difference m_21^0 - B_T^0 between the corrected (face-on) 21-cm emission line magnitude and the similarly corrected magnitude in the B_T system. N.n. Since m_21 and B_T are provided in this table, there is no need to list the uncorrected index.
V_21cmfloat8km/s Mean heliocentric radial velocity, and its mean error, in km/s derived from neutral hydrogen observations
V_21cmErrfloat8km/s Error in V_21cm
V_optfloat8km/s mean heliocentric radial velocity, and its mean error, in km/s derived from optical observations
V_optErrfloat8km/s Error in V_opt
V_GSRfloat8km/s weighted mean of the neutral hydrogen and optical velocities, corrected to the ``Galactic standard of rest
V_3Kfloat8km/s weighted mean velocity corrected to the reference frame defined by the 3 K microwave background radiation
htmIDbigint8 CODE_HTM20-deep hierarchical trangular mesh ID of this object
cxfloat8 POS_EQ_CART_Xunit vector for ra+dec
cyfloat8 POS_EQ_CART_Yunit vector for ra+dec
czfloat8 POS_EQ_CART_Zunit vector for ra+dec
objIdbigint8 ID_MAINthe main primary key