SExtractor Draft - METU Astrophysics

11FULLSTARNNW NAME — string Name of the file containing the neuralnetworkweights for star/galaxy separation.THRESH TYPE RELATIVE keywords (n ≤ 2) Meaning of the DETECT THRESH andANALYSIS THRESH parameters :RELATIVE – scaling factor to the backgroundRMS,ABSOLUTE – absolute level (in ADUs or in surfacebrightness).VERBOSE TYPE NORMAL keyword How much SExtractor comments itsoperations:QUIET– run silently,NORMAL– display warnings and limited infoconcerning the work in progress,EXTRA WARNINGS – like NORMAL, plus a few more warningsif necessary,– display a more complete informationand the principal parameters of all theobjects extracted.WEIGHT GAIN Y boolean If true, weight maps are considered asgain maps.WEIGHT IMAGE weight.fits strings (n ≤ 2) File name of the detection and measurement“weight-image”, respectively.WEIGHT TYPE NONE keywords (n ≤ 2) Weighting scheme (for single image, ordetection and measurement images):NONEBACKGROUNDMAP RMSMAP VARMAP WEIGHT– no weighting,– variance-map derived from the imageitself,– variance-map derived from an externalRMS-map,– external variance-map,– variance-map derived from an externalweight-map,3.3 The catalog parameter fileIn addition to the configuration file detailed above, SExtractor needs a file containing the list ofparameters that will be listed in the output catalog for every detection. This allows the softwareto compute only catalog parameters that are needed. The name of this catalog-parameter fileis traditionally suffixed with .param, and must be specified using the PARAMETERS NAME configparameter.3.3.1 FormatThe format of the catalog parameter list is ASCII, and there must be only one keyword perline. Presently two kinds of keywords are recognized by SExtractor: scalars and vectors. S-calars, like X IMAGE, yield single numbers in the output catalog. Vectors, like MAG APER(4) or1 Optional parameter