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Table: sga2020.ellipse
(The bold columns are indexed columns)
Column NameDescriptionDatatype
baMinor-to-major axis ratio as measured from the ellipse moments (or equivalent to BA_LEDA if the ellipse moments could not be measured)REAL
ba_ledaRatio of the semi-minor axis to the semi-major axis taken from the reference indicated in REF (but see also the BYHAND column)REAL
bricknameName of brick encoding the brick sky position e.g. 1126p222 is centered on RA=112.6, Dec=+22.2CHAR
byhandFlag indicating whether one or more of RA_LEDA, DEC_LEDA, D25_LEDA, PA_LEDA, BA_LEDA, or MAG_LEDA were changed from their published HyperLeda values, generally based on visual inspectionSMALLINT
d25_ledaApproximate major-axis diameter at the 25 mag arcsec-2 (optical) surface brightness isophote taken from the reference indicated in REF (but see also the BYHAND column)REAL
d26Major axis diameter measured at the mu=26 mag arcsec-2 r-band isophote based on SMA_SB26. If the r-band surface-brightness profile could not be measured at this level the diameter is set equal to 2.5 x SMA_SB25 or 1.5 x D25_LEDA in that order of priorityREAL
d26_refReference indicating the origin of the DIAM measurement: SB26, SB25, or LEDACHAR
decDeclination (J2000) based on the Tractor model fit; identical to DEC in the tractor tableDOUBLE
dec_ledaDeclination (J2000) from the reference indicated in REF (but see also the BYHAND column)DOUBLE
dec_momentLight-weighted declination (J2000) as measured from the ellipse moments. Equivalent to DEC_Y0 in the Ellipse Fits table (https://www.legacysurvey.org/sga/sga2020/#ellipse-fits) but set to DEC_LEDA if ellipse-fitting was not carried outDOUBLE
elatEcliptic latitudeDOUBLE
ellipsebitSee the bitsmasks documentation here https://www.legacysurvey.org/sga/sga2020/#bitmasksINTEGER
elonEcliptic longitudeDOUBLE
g_cog_params_alpha1Best-fitting parameter alpha1 in g-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
g_cog_params_alpha2Best-fitting parameter alpha2 in g-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
g_cog_params_chi2Chi2 of the fit to the curve of growth in g-band (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
g_cog_params_m0Best-fitting parameter m0 in g-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
g_cog_params_mtotBest-fitting parameter m1 in g-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
g_mag_sb22Cumulative brightness measured within sma_sb22 (-1 if not measured)REAL
g_mag_sb22_5Cumulative brightness measured within sma_sb22_5 (-1 if not measured)REAL
g_mag_sb22_5_errUncertainty in g_mag_sb22_5 (1 sigma)REAL
g_mag_sb22_errUncertainty in g_mag_sb22 (1 sigma)REAL
g_mag_sb23Cumulative brightness measured within sma_sb23 (-1 if not measured)REAL
g_mag_sb23_5Cumulative brightness measured within sma_sb23_5 (-1 if not measured)REAL
g_mag_sb23_5_errUncertainty in g_mag_sb23_5 (1 sigma)REAL
g_mag_sb23_errUncertainty in g_mag_sb23 (1 sigma)REAL
g_mag_sb24Cumulative brightness measured within sma_sb24 (-1 if not measured)REAL
g_mag_sb24_5Cumulative brightness measured within sma_sb24_5 (-1 if not measured)REAL
g_mag_sb24_5_errUncertainty in g_mag_sb24_5 (1 sigma)REAL
g_mag_sb24_errUncertainty in g_mag_sb24 (1 sigma)REAL
g_mag_sb25Cumulative brightness measured within sma_sb25 (-1 if not measured)REAL
g_mag_sb25_5Cumulative brightness measured within sma_sb25_5 (-1 if not measured)REAL
g_mag_sb25_5_errUncertainty in g_mag_sb25_5 (1 sigma)REAL
g_mag_sb25_errUncertainty in g_mag_sb25 (1 sigma)REAL
g_mag_sb26Cumulative brightness measured within sma_sb26 (-1 if not measured)REAL
g_mag_sb26_errUncertainty in g_mag_sb26 (1 sigma)REAL
g_sma50Half-light semi-major axis length in g-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting; -1 if not measured)REAL
galaxyUnique galaxy nameVARCHAR
glatGalactic latitudeDOUBLE
glonGalactic longitudeDOUBLE
group_decDeclination of the group weighted by D25_LEDADOUBLE
group_diameterApproximate group diameter. For groups with a single galaxy this quantity equals D25_LEDA. For galaxies with multiple members we estimate the diameter of the group as the maximum separation of all the pairs of group members (plus their D25_LEDA diameter)REAL
group_idUnique group identification numberBIGINT
group_multGroup multiplicity (i.e. number of group members from the parent sample)SMALLINT
group_nameUnique group name constructed from the name of its largest member (based on D25_LEDA) and the suffix _GROUP (e.g. PGC193199_GROUP)VARCHAR
group_primaryFlag indicating the primary (i.e. largest) group memberSMALLINT
group_raRight ascencion of the group weighted by D25_LEDADOUBLE
htm9HTM index (order 9 => ~10 arcmin size)INTEGER
mag_ledaApproximate brightness (Note: this magnitude estimate is heterogeneous in both bandpass and aperture but for most galaxies it is measured in the B-band within D25_LEDA ; use with care)REAL
morphtypeVisual morphological type from Hyperleda (if available)VARCHAR
nest4096HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec size)INTEGER
paGalaxy position angle measured positive clockwise from North as measured from the ellipse moments (or equivalent to PA_LEDA if the ellipse moments could not be measured)REAL
pa_ledaGalaxy position angle measured positive clockwise from North taken from the reference indicated in REF (but see also the BYHAND column)REAL
pgcUnique identifier from the Principal Catalogue of Galaxies (-1 if none or not known)BIGINT
r_cog_params_alpha1Best-fitting parameter alpha1 in r-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
r_cog_params_alpha2Best-fitting parameter alpha2 in r-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
r_cog_params_chi2Chi2 of the fit to the curve of growth in r-band (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
r_cog_params_m0Best-fitting parameter m0 in r-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
r_cog_params_mtotBest-fitting parameter m1 in r-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
r_mag_sb22Cumulative brightness measured within sma_sb22 (-1 if not measured)REAL
r_mag_sb22_5Cumulative brightness measured within sma_sb22_5 (-1 if not measured)REAL
r_mag_sb22_5_errUncertainty in r_mag_sb22_5 (1 sigma)REAL
r_mag_sb22_errUncertainty in r_mag_sb22 (1 sigma)REAL
r_mag_sb23Cumulative brightness measured within sma_sb23 (-1 if not measured)REAL
r_mag_sb23_5Cumulative brightness measured within sma_sb23_5 (-1 if not measured)REAL
r_mag_sb23_5_errUncertainty in r_mag_sb23_5 (1 sigma)REAL
r_mag_sb23_errUncertainty in r_mag_sb23 (1 sigma)REAL
r_mag_sb24Cumulative brightness measured within sma_sb24 (-1 if not measured)REAL
r_mag_sb24_5Cumulative brightness measured within sma_sb24_5 (-1 if not measured)REAL
r_mag_sb24_5_errUncertainty in r_mag_sb24_5 (1 sigma)REAL
r_mag_sb24_errUncertainty in r_mag_sb24 (1 sigma)REAL
r_mag_sb25Cumulative brightness measured within sma_sb25 (-1 if not measured)REAL
r_mag_sb25_5Cumulative brightness measured within sma_sb25_5 (-1 if not measured)REAL
r_mag_sb25_5_errUncertainty in r_mag_sb25_5 (1 sigma)REAL
r_mag_sb25_errUncertainty in r_mag_sb25 (1 sigma)REAL
r_mag_sb26Cumulative brightness measured within sma_sb26 (-1 if not measured)REAL
r_mag_sb26_errUncertainty in r_mag_sb26 (1 sigma)REAL
r_sma50Half-light semi-major axis length in r-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting; -1 if not measured)REAL
raRight ascension (J2000) based on the Tractor model fit; identical to RA in the tractor tableDOUBLE
ra_ledaRight ascension (J2000) from the reference indicated in REF (but see also the BYHAND column)DOUBLE
ra_momentLight-weighted right ascension (J2000) as measured from the ellipse moments. Equivalent to RA_X0 in the Ellipse Fits table (https://www.legacysurvey.org/sga/sga2020/#ellipse-fits) but set to RA_LEDA if ellipse-fitting was not carried outDOUBLE
random_idRandom ID in the range 0.0 => 100.0 (not unique)REAL
refUnique reference name indicating the original source of the object as described in Sample Selection here https://www.legacysurvey.org/sga/sga2020/#sample-selection: LEDA-20181114, LGDWARFS, RC3, OpenNGC, or DR8VARCHAR
ring256HEALPIX index (Nsides 256, Ring scheme => ~14 arcmin size)INTEGER
sb_d25_ledaMean surface brightness within D25_LEDA based on the brightness in MAG_LEDAREAL
sga_galaxySGA galaxy name constructed as SGA-2020 SGA_IDVARCHAR
sga_idUnique integer identifierBIGINT
sma_momentSecond moment of the light distribution along the major axis based on the measured ellipse moments (-1 if not measured). Equivalent to MAJORAXIS (but converted to arcsec) in the Ellipse Fits table (https://www.legacysurvey.org/sga/sga2020/#ellipse-fits)REAL
sma_sb22Semi-major axis length at the mu=22 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb22_5Semi-major axis length at the mu=22.5 mag arcsec^^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb22_5_errUncertainty in sma_sb22_5 (1 sigma)REAL
sma_sb22_errUncertainty in sma_sb22 (1 sigma)REAL
sma_sb23Semi-major axis length at the mu=23 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb23_5Semi-major axis length at the mu=23.5 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb23_5_errUncertainty in sma_sb23_5 (1 sigma)REAL
sma_sb23_errUncertainty in sma_sb23 (1 sigma)REAL
sma_sb24Semi-major axis length at the mu=24 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb24_5Semi-major axis length at the mu=24.5 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb24_5_errUncertainty in sma_sb24_5 (1 sigma)REAL
sma_sb24_errUncertainty in sma_sb24 (1 sigma)REAL
sma_sb25Semi-major axis length at the mu=25 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb25_5Semi-major axis length at the mu=25.5 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb25_5_errUncertainty in sma_sb25_5 (1 sigma)REAL
sma_sb25_errUncertainty in sma_sb25 (1 sigma)REAL
sma_sb26Semi-major axis length at the mu=26 mag arcsec^-2 isophote in the r-band (-1 if not measured)REAL
sma_sb26_errUncertainty in sma_sb26 (1 sigma)REAL
z_cog_params_alpha1Best-fitting parameter alpha1 in z-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
z_cog_params_alpha2Best-fitting parameter alpha2 in z-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
z_cog_params_chi2Chi2 of the fit to the curve of growth in z-band (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
z_cog_params_m0Best-fitting parameter m0 in z-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
z_cog_params_mtotBest-fitting parameter m1 in z-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting)REAL
z_ledaHeliocentric redshift from HyperLeda. Note: a missing value represented with -1.0 does not imply that no redshift existsREAL
z_mag_sb22Cumulative brightness measured within sma_sb22 (-1 if not measured)REAL
z_mag_sb22_5Cumulative brightness measured within sma_sb22_5 (-1 if not measured)REAL
z_mag_sb22_5_errUncertainty in z_mag_sb22_5 (1 sigma)REAL
z_mag_sb22_errUncertainty in z_mag_sb22 (1 sigma)REAL
z_mag_sb23Cumulative brightness measured within sma_sb23 (-1 if not measured)REAL
z_mag_sb23_5Cumulative brightness measured within sma_sb23_5 (-1 if not measured)REAL
z_mag_sb23_5_errUncertainty in z_mag_sb23_5 (1 sigma)REAL
z_mag_sb23_errUncertainty in z_mag_sb23 (1 sigma)REAL
z_mag_sb24Cumulative brightness measured within sma_sb24 (-1 if not measured)REAL
z_mag_sb24_5Cumulative brightness measured within sma_sb24_5 (-1 if not measured)REAL
z_mag_sb24_5_errUncertainty in z_mag_sb24_5 (1 sigma)REAL
z_mag_sb24_errUncertainty in z_mag_sb24 (1 sigma)REAL
z_mag_sb25Cumulative brightness measured within sma_sb25 (-1 if not measured)REAL
z_mag_sb25_5Cumulative brightness measured within sma_sb25_5 (-1 if not measured)REAL
z_mag_sb25_5_errUncertainty in z_mag_sb25_5 (1 sigma)REAL
z_mag_sb25_errUncertainty in z_mag_sb25 (1 sigma)REAL
z_mag_sb26Cumulative brightness measured within sma_sb26 (-1 if not measured)REAL
z_mag_sb26_errUncertainty in z_mag_sb26 (1 sigma)REAL
z_sma50Half-light semi-major axis length in z-band based on the fit to the curve of growth (see the Ellipse-Fitting section here https://www.legacysurvey.org/sga/sga2020/#ellipse-fitting; -1 if not measured)REAL