| Contains the parameters provided for each source in the 2dFGRS NGP photometric catalogue. |
| The photometric catalogue has been derived from APM scans of the Southern Sky Survey (see Colless et al. 2001). It's highly complete down to its nominal limit at an extinction-corrected magnitude (BJSEL) of approximately bJ=19.45; this limit varies slightly from field to field. Required constraints:
|
| Name | Type | Length | Unit | Description | Default Value | Unified Content Descriptor |
|---|---|---|---|---|---|---|
| SEQNUM | int | 4 | Assigned sequence number to this object; determines the FITS filename (SEQNUM.fits) | meta.id | ||
| cx | float | 8 | unit vector of spherical co-ordinates | pos.distance;pos.cartesian.x | ||
| cy | float | 8 | unit vector of spherical co-ordinates | pos.distance;pos.cartesian.y | ||
| cz | float | 8 | unit vector of spherical co-ordinates | pos.distance;pos.cartesian.z | ||
| htmID | bigint | 8 | Hierarchical Triangular Mesh (HTM) index, 20 deep, for equatorial co-ordinates | pos.eq | ||
| ra | float | 8 | R.A. (B1950) in HH MM SS.SS | |||
| dec | float | 8 | Dec. (B1950) in DD MM SS.S | |||
| BJSEL | real | 4 | Final bj magnitude with extinction correction (i.e. with corrections for isophote, field-effects and plate-matching, then calibrated to total mags with saturation correction, and then extinction corrected) | |||
| PROB | real | 4 | psi classification parameter: for eyeballed galaxies: psi*1000 = (10000 + abs(jon) + psi*100); for eyeballed non-galaxies: psi*1000 = -(10000 + abs(jon) + psi*100) | |||
| PARK | real | 4 | k classification parameter = k / k_star | |||
| PARMU | real | 4 | mu classification parameter = mu / mu_star | |||
| IGAL | int | 4 | Final classification: -4 = noise; -3 = star + star; -2 = star + fuzz; -1 = star; 0 = galaxy + star merger; 1 = galaxy; 2 = galaxy + galaxy merger | |||
| JON | int | 4 | Eyeball classification, value > 0 only for galaxies brighter than about 18th mag: 0 = noise; 1 = S0; 2 = elliptical; 3 = spiral; 4 = irregular; 5 = undetermined galaxy; 6 = star; 7 = star + star merger; 8 = galaxy + star merger; 9 = galaxy + galaxy merger | |||
| ORIENT | real | 4 | Orientation measured in degrees clockwise from E to W: orient = 180/pi * atan(2*sxy/((sxx + syy)*(1 + e)-syy)) | |||
| ECCENT | real | 4 | Eccentricity (e) e*200 = 200*(((sxx-syy)**2 + 4sxy**2)**0.5)/(sxx + syy) | |||
| AREA | real | 4 | Isophotal area in pixels | |||
| X_BJ | real | 4 | Plate x_bj in 8 micron pixels | |||
| Y_BJ | real | 4 | Plate y_bj in 8 micron pixels | |||
| DX | real | 4 | Distortion corrected difference (x_bj - x_R)*100 | |||
| DY | real | 4 | Distortion corrected difference (y_bj - y_R)*100 | |||
| BJG | real | 4 | Final bj magnitude without extinction correction | |||
| RMAG | real | 4 | Unmatched APM 'total' mag | |||
| PMAG | real | 4 | Unmatched raw APM profile integrated mag | |||
| FMAG | real | 4 | Unmatched raw APM 2" profile integrated mag | |||
| SMAG | real | 4 | Unmatched raw stellar mag (from APMCAL) | |||
| REDMAG | real | 4 | Not used | |||
| IFIELD | int | 4 | UKST field | |||
| IGFIELD | int | 4 | Galaxy number in UKST field | |||
| NAME | varchar | 10 | 2dFGRS assigned name; if either (i) BJSELOLD is fainter than 19.45, or (ii) the object could not be allocated to a fibre by the configuration algorithm, then NAME is blank | |||
| BJG_OLD | real | 4 | Original bj magnitude without extinction correction (prior to re-calibration to BJG) | |||
| BJSELOLD | real | 4 | Original bj magnitude with extinction correction (prior to re-calibration to BJSEL); used to select survey sample | |||
| BJG_100 | real | 4 | 100k release bj magnitude without extinction correction (prior to re-calibration to BJG) | |||
| BJSEL_100 | real | 4 | 100k release bj magnitude with extinction correction (prior to re-calibration to BJSEL) | |||
| Total length | 162 |