Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/7.1.0/doc/arfgen/node19.html
Дата изменения: Thu Nov 15 16:15:38 2007
Дата индексирования: Sat Dec 22 08:43:09 2007
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Поисковые слова: south pole
Using an image mask XMM-Newton SAS Home Page
XMM-Newton Science Analysis System


arfgen (arfgen-1.73.3) [???]

Spatial region settings Spatial region settings Spatial variation of source Home Index

Meta Index / Home Page / Description / Spatial region settings

Using an image mask

A spectrum may be produced by filtering events using a 2-dimensional mask in either sky or detector coordinates. This is supported for the calculation of the ARF of an extended source. To maintain the resolution of the image mask it is important to use a finely binned detector map within arfgen (see section 7.3). Preferable is a detector pixel image which just encompasses the masked region, otherwise a flat detector map will be ok.

e.g.

arfgen spectrumset=spectrum.ds extendedsource=yes detxbins=400 detybins=400
detxoffset=10000 detyoffset=10000 withdetbounds=yes

The chip gap and bad pixel/column corrections will be correctly calculated if the detector map is fine enough. The backscale task will also produce the correct area calculation in this case.



XMM-Newton SOC/SSC -- 2007-11-15