High reliability sub-selection of galaxies from Source. |
This view of table Source defines a reliable selection of extended objects (ie. galaxies) from Source. Reliable in this context means that each galaxy must appear on the UKJ, UKR and UKI plates; must be classed as non-stellar on UKJ & UKR; must not be deblended on UKJ or UKR; and must have good quality UKJ, UKR & UKI (ie. quality < 128). A magnitude cut of Bj < 20.0 provides a reliability of better than approximately 90%. The use of this, or any other, SSA view depends on the particular science application. If your science application needs a highly reliable selection of galaxies, then use this view. But be aware that this selection is not in any sense complete, particularly at faint magnitudes. Note also that because the SSA has general poor completeness of extragalactic objects at low Galactic latitudes and severe contamination by blended stars which are indistinguishable from extended sources, this view is currently limited to |b| > 35.0 and Galactic Centre distance d > 45.0 (to avoid the crowded Bulge region). The details and SQL SELECT corresponding to this view are available here. |
Name | Type | Length | Unit | Description | Default Value | Unified Content Descriptor |
---|---|---|---|---|---|---|
objID | bigint | 8 | Unique identifier of merged source | ID_MAIN | ||
objIDB | bigint | 8 | objID for B band detection merged into this object | 0 | ID_ASSOCIATED | |
objIDR1 | bigint | 8 | objID for R1 band detection merged into this object | 0 | ID_ASSOCIATED | |
objIDR2 | bigint | 8 | objID for R2 band detection merged into this object | 0 | ID_ASSOCIATED | |
objIDI | bigint | 8 | objID for I band detection merged into this object | 0 | ID_ASSOCIATED | |
htmId | bigint | 8 | Hierarchical Triangular Mesh (20-deep) of centroid | POS_GENERAL | ||
epoch | real | 4 | year | Epoch of position (variance weighted mean epoch of available measures) | TIME_EPOCH | |
ra | float | 8 | degrees | Mean RA, computed from detections merged in this catalogue | POS_EQ_RA_MAIN | |
dec | float | 8 | degrees | Mean Dec, computed from detections merged in this catalogue | POS_EQ_DEC_MAIN | |
sigRA | float | 8 | degrees | Uncertainty in RA (formal random error not inc. systematic errors) | ERROR | |
sigDec | float | 8 | degrees | Uncertainty in Dec (formal random error not inc. systematic errors) | ERROR | |
cx | float | 8 | Cartesian x of unit (ra,dec) vector on celestial sphere | POS_EQ_X | ||
cy | float | 8 | Cartesian y of unit (ra,dec) vector on celestial sphere | POS_EQ_Y | ||
cz | float | 8 | Cartesian z of unit (ra,dec) vector on celestial sphere | POS_EQ_Z | ||
muAcosD | real | 4 | mas/yr | Proper motion in RA direction | -0.99999995e9 | POS_EQ_PMRA |
muD | real | 4 | mas/yr | Proper motion in Dec direction | -0.99999995e9 | POS_EQ_PMDEC |
sigMuAcosD | real | 4 | mas/yr | Error on proper motion in RA direction | -0.99999995e9 | ERROR |
sigMuD | real | 4 | mas/yr | Error on proper motion in Dec direction | -0.99999995e9 | ERROR |
chi2 | real | 4 | Chi-squared value of proper motion solution | -0.99999995e9 | FIT_CHI2 | |
Nplates | tinyint | 1 | No. of plates used for this proper motion measurement | NUMBER | ||
classMagB | real | 4 | mag | B band magnitude selected by B image class | -99.999995 | PHOT_PHG_BJ |
classMagR1 | real | 4 | mag | R1 band magnitude selected by R1 image class | -99.999995 | PHOT_PHG_R |
classMagR2 | real | 4 | mag | R2 band magnitude selected by R2 image class | -99.999995 | PHOT_PHG_R |
classMagI | real | 4 | mag | I band magnitude selected by I image class | -99.999995 | PHOT_PHG_I |
gCorMagB | real | 4 | mag | B band magnitude assuming object is galaxy | -99.999995 | PHOT_PHG_BJ |
gCorMagR1 | real | 4 | mag | R1 band magnitude assuming object is galaxy | -99.999995 | PHOT_PHG_R |
gCorMagR2 | real | 4 | mag | R2 band magnitude assuming object is galaxy | -99.999995 | PHOT_PHG_R |
gCorMagI | real | 4 | mag | I band magnitude assuming object is galaxy | -99.999995 | PHOT_PHG_I |
sCorMagB | real | 4 | mag | B band magnitude assuming object is star | -99.999995 | PHOT_PHG_BJ |
sCorMagR1 | real | 4 | mag | R1 band magnitude assuming object is star | -99.999995 | PHOT_PHG_R |
sCorMagR2 | real | 4 | mag | R2 band magnitude assuming object is star | -99.999995 | PHOT_PHG_R |
sCorMagI | real | 4 | mag | I band magnitude assuming object is star | -99.999995 | PHOT_PHG_I |
meanClass | tinyint | 1 | Estimate of image class based on unit-weighted mean of individual classes | CLASS_OBJECT | ||
classB | tinyint | 1 | Image classification from B band detection | 0 | CLASS_OBJECT | |
classR1 | tinyint | 1 | Image classification from R1 band detection | 0 | CLASS_OBJECT | |
classR2 | tinyint | 1 | Image classification from R2 band detection | 0 | CLASS_OBJECT | |
classI | tinyint | 1 | Image classification from I band detection | 0 | CLASS_OBJECT | |
ellipB | real | 4 | Ellipticity of B band detection | -0.99999995e9 | PHYS_ELLIPTICITY | |
ellipR1 | real | 4 | Ellipticity of R1 band detection | -0.99999995e9 | PHYS_ELLIPTICITY | |
ellipR2 | real | 4 | Ellipticity of R2 band detection | -0.99999995e9 | PHYS_ELLIPTICITY | |
ellipI | real | 4 | Ellipticity of I band detection | -0.99999995e9 | PHYS_ELLIPTICITY | |
qualB | int | 4 | Bitwise quality flag from B band detection | -1 | CODE_QUALITY | |
qualR1 | int | 4 | Bitwise quality flag from R1 band detection | -1 | CODE_QUALITY | |
qualR2 | int | 4 | Bitwise quality flag from R2 band detection | -1 | CODE_QUALITY | |
qualI | int | 4 | Bitwise quality flag from I band detection | -1 | CODE_QUALITY | |
blendB | int | 4 | Blend flag from B band detection | -99999999 | CODE_MULT_INDEX | |
blendR1 | int | 4 | Blend flag from R1 band detection | -99999999 | CODE_MULT_INDEX | |
blendR2 | int | 4 | Blend flag from R2 band detection | -99999999 | CODE_MULT_INDEX | |
blendI | int | 4 | Blend flag from I band detection | -99999999 | CODE_MULT_INDEX | |
prfStatB | real | 4 | N(0,1) | Profile statistic from B band detection | -0.99999995e9 | CLASS_STAR/GALAXY |
prfStatR1 | real | 4 | N(0,1) | Profile statistic from R1 band detection | -0.99999995e9 | CLASS_STAR/GALAXY |
prfStatR2 | real | 4 | N(0,1) | Profile statistic from R2 band detection | -0.99999995e9 | CLASS_STAR/GALAXY |
prfStatI | real | 4 | N(0,1) | Profile statistic from I band detection | -0.99999995e9 | CLASS_STAR/GALAXY |
l | real | 4 | degrees | The Galactic longitude of the source | POS_GAL_LON | |
b | real | 4 | degrees | The Galactic latitude of the source | POS_GAL_LAT | |
d | real | 4 | degrees | The great-circle distance of the source from the Galactic centre | POS_ANG_DIST_REL | |
Ebmv | real | 4 | mag | The estimated foreground reddening at this position from Schlegel et al. (1998) | PHOT_EXTINCTION_GAL | |
Total length | 262 |