SExtractor Draft - METU Astrophysics

8BACK SIZE — integers (n ≤ 2) Size, or Width,Height (in pixels) of abackground mesh.BACK TYPE INTERNAL keywords (n ≤ 2) What background is subtracted fromthe images:INTERNAL – the internal interpolatedbackground-map,MANUAL– a user-supplied constant value providedin BACK VALUE.BACK VALUE 0.0,0.0 floats (n ≤ 2) in BACK TYPE MANUAL mode, the constantvalue to be subtracted from theimages.BACKPHOTO THICK 24 integer Thickness (in pixels) of the backgroundLOCAL annulus.BACKPHOTO TYPE GLOBAL keyword Background used to compute magnitudes:GLOBAL– taken directly from the backgroundLOCALmap,– recomputed in a “rectangular annulus”around the object.CATALOG NAME — string Name of the output catalogue. Ifthe name “STDOUT” is given andCATALOG TYPE is set to ASCII,ASCII HEAD, or ASCII SKYCAT, thecatalogue will be piped to thestandard output (stdout)CATALOG TYPE — keyword Format of output catalog:ASCII– ASCII table; the simplest, but spaceand time consuming,– as ASCII, preceded by a header containinginformation about the content,ASCII SKYCAT – SkyCat ASCII format (WCS coordinatesrequired),FITS 1.0 – FITS format as in SExtractor 1,ASCII HEADFITS LDAC – FITS “LDAC” format (the originalimage header is copied).CHECKIMAGE NAME check.fits strings (n ≤ 16) File name for each “check-image”.CHECKIMAGE TYPE NONE keywords (n ≤ 16) Type of information to put in the“check-images”:NONE– no check-image,IDENTICAL – identical to input image (useful forconverting formats),BACKGROUND – full-resolution interpolated backgroundmap,BACKGROUND RMS – full-resolution interpolated backgroundnoise map,MINIBACKGROUND – low-resolution background map,MINIBACK RMS – low-resolution background noisemap,-BACKGROUND – background-subtracted image,FILTERED – background-subtracted filtered image(requires FILTER = Y),