Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/5.4.1/doc/omsource/node12.html
Дата изменения: Fri Jan 10 23:30:01 2003
Дата индексирования: Sat Dec 22 10:29:37 2007
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XMM-Newton Science Analysis System


omsource (omsource-1.1.11) [xmmsas_20030110_1802-5.4.1]

Meta Index / Home Page / Photometry

Notes

• The aperture radius can be changed between 6/bin and 12/bin pixels, where bin is the binning factor (1 for unbinned data, 2 otherwise). The upper limit corresponds to the cal calibration radius. Using a smaller radius than the upper limit will result in the source counts being scaled to the calibration radius using the point-spread function (this correction is the tabulated psf1 corr value).

• The current version of omsource cannot properly do photometry on extended sources- this will be rectified in future versions.