Sextractor for dummies - METU Astrophysics
Sextractor for dummies - METU Astrophysics
Sextractor for dummies - METU Astrophysics
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Appendix B<br />
SE parameters<br />
Below the settings of SE are listed with their function and the best way to use them in a crowded<br />
field. These values were obtained after using SE on a series of simulations of Sextans A (north<br />
pointing wf2) and the HDF. The success rate was measured by the number of objects classified as<br />
galaxies in the simulations actually found in the HDF with the same settings.<br />
CATALOG_TYPE ASCII # This means no header with the values<br />
# in different colums is printed.<br />
PARAMETERS_NAME /net/bartoli/bartoli/data2/Programs/default2.param<br />
# file with the names of the parameters to be<br />
# printed in the catalogs.<br />
DETECT_TYPE CCD # type of image (alt PHOTO)<br />
DETECT_MINAREA 16 # Minimum area of connected pixels in an object.<br />
FILTER Y<br />
FILTER_NAME /net/bartoli/bartoli/data2/Programs/sextractor2.1.6/config/gauss_4.0<br />
DEBLEND_NTHRESH 32 # the number of thresholds the intensity<br />
# range is devided up in. 32 is the most<br />
# common number.<br />
DEBLEND_MINCONT 0.005 # percentage of flux a separate peak must<br />
# have to be considered a separate object.<br />
CLEAN Y # Should objects close to bright object be<br />
# removed from the catalogs<br />
CLEAN_PARAM 1.0 # measure <strong>for</strong> ’clean’ing. wish I knew what it ment...<br />
PHOT_APERTURES 5,10,20,30 # Fixed apertures in pixels<br />
PHOT_AUTOPARAMS 2.5, 3.5<br />
SATUR_LEVEL 200000. # saturation occurs at
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