12.07.2015 Views

SExtractor Draft - METU Astrophysics

SExtractor Draft - METU Astrophysics

SExtractor Draft - METU Astrophysics

SHOW MORE
SHOW LESS
  • No tags were found...

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

7then be separated by commas. Integers can be given as decimals, in octal form (preceded by digitO), or in hexadecimal (preceded by 0x). The hexadecimal format is particularly convenient forwriting multiplexed bit values such as binary masks. Environment variables, written as $HOMEor ${HOME} are expanded, and not only for string parameters. Some parameters are assigneddefault values in <strong>SExtractor</strong> and can therefore be omitted from the configuration file; they arelisted in §3.2.2.3.2.2 Configuration parameter listHere is a complete list of all the configuration parameters known to <strong>SExtractor</strong>. Many of themare just used with default values. Please refer to §?? for a detailed description of their meaning.Parameter default type DescriptionANALYSIS THRESH — floats (n ≤ 2) Threshold (in surface brightness) atwhich CLASS STAR and FWHM operate.1 argument: relative toBackground RMS. 2 arguments: mu(mag.arcsec −2 ), Zero-point (mag).ASSOC DATA 2,3,4 integers (n ≤ 32) Nos of the columns in the ASSOC filethat will be copied to the catalog output.ASSOC NAME sky.list string Name of the ASSOC ASCII file.ASSOC PARAMS 2,3,4 integers (2 ≤ n ≤ 3) Nos of the columns in the ASSOC filethat will be used as coordinates andweight for cross-matching.ASSOC RADIUS 2.0 float Search radius (in pixels) for ASSOC.ASSOC TYPE MAG SUM keyword Method for cross-matching in ASSOC:FIRST– keep values corresponding to thefirst match found,NEAREST– values corresponding to the nearestmatch found,MEAN– weighted-average values,MAG MEAN– exponentialy weighted-average values,SUM– sum values,MAG SUM– exponentialy sum values,MIN– keep values corresponding to thematch with minimum weight,MAX– keep values corresponding to thematch with maximum weight.ASSOCSELEC TYPE MATCHED keyword What sources are printed in the outputcatalog in case of ASSOC:ALL– all detections,MATCHED– only matched detections,-MATCHED – only detections that were notmatched.BACK FILTERSIZE — integers (n ≤ 2) Size, or Width,Height (in backgroundmeshes) of the background-filteringmask.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!