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From: Martin Stuhlinger <stuhli@astro.uni-tuebingen.de>
Subject: Flux of pile-uped sources
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Date: Tue, 22 Jan 2002 12:19:15 +0100 (CET)
From: Martin Stuhlinger <stuhli@astro.uni-tuebingen.de>
To: XMM Helpdesk <xmmhelp@xvsoc01.vilspa.esa.es>
Subject: Flux of pile-uped sources
Dear helpdesk,

how can I get the real flux of a source with pile-up at the source center?

I have a MOS small window mode observation where I have to cut out a
circle with radius of 4 pixels to avoid pile-up effects. Using the
coordinates rawx/y I can see in the image a field of 50x50 pixels
(according to user handbook it should be 100x100 pixels. Is there a
onboard binning of 4 pixels). To get the real flux I need the ratio of
the integral over the complete PSF and the integral over the PSF with a
hole in the center with the same size.

I generated a PSF using calview. It looks similar to the source image, so
this could not be that wrong. The image of this generated PSF shows
199x199 pixels. What I couldn't find so far is a correlation of the pixel
sizes between this generated PSF image and the real pixels. Where can I
find documentation for this problem?


Best regards,

Martin



------------------------------------------------------------
Martin Stuhlinger          - stuhli@astro.uni-tuebingen.de -

INTEGRAL: On Board Real Time Data Processing of IBIS
XMM:      Active Galactic Nuclei

Institute for Astronomy and Astrophysics IAAT  - Astronomy -
Sand 1  D-72076 Tuebingen    Pho: **49 / (0)7071 / 29_7_5473
------------------------------------------------------------


Reply 1

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From: Matteo Guainazzi <xmmhelp@xmm.vilspa.esa.es>
To: stuhli@astro.uni-tuebingen.de
Subject: Re: Flux of pile-uped sources (PR#4525)
Date: Tue Jan 22 15:37:04 2002
Dear Martin,

 there are three potantial ways to address your question:

1. the header of the image extensions in the PSF CCF constituent
   contains the pixel size in mm ([YZ]_PIXSZ). The correspondence
   between mm and arcseconds is reported in Tab.1 of the XMM-Newton
   User Handbook

2. two extensions of each PSF CCF constituent contain the
   parameterization of the PSF. The adopted models and relevant
   parameters are explained in: 	

	http://xmm.vilspa.esa.es/docs/documents/CAL-SRN-0002-1-0.ps.gz

3. since you are interested only in the encircled energy fraction as
   a function of the radius, you may want to look at the corresponding
   CCF constituent. In "calview", select:

	View --> Encircled Energy Fraction

 Please, do not hesitate to ask if something remains not clear.

 Regards,

 Matteo Guainazzi
 XMM-Newton Science Operation Center
 User Support Group

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