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From: bjm@star.sr.bham.ac.uk
Subject: calview psf problems
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Date: Thu, 28 Nov 2002 18:25:24 GMT
From: bjm@star.sr.bham.ac.uk
To: xmmhelp@xmm.vilspa.esa.es
CC: bjm@star.sr.bham.ac.uk
Subject: calview psf problems
Full_Name: Ben Maughan
Submission from: (NULL) (147.188.32.177)


Hi Helpdesk,
 I've been generating a series of PSF images with calview, but have noticed that
there seem to be some bugs. 
 If I set the accuracy level to LOW, or MEDIUM, then the PSF varies depending on
the energy and angles that I specify, but is identical for the MOS1, MOS2, and
EPN detectors, which shouldn't be true. The LOW and MEDIUM accuracy PSFs also
appear very different from eachother - what is this difference due to?
 If I set the accuracy to EXTENDED or HIGH, then the PSFs are different for the
three cameras, but do not vary with energy or angle!
 How can I get a fits image of the appropriate PSF for a given camera, postion,
and energy?
 Thanks a lot,
 Ben

Reply 1

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From: Matteo Guainazzi <xmmhelp@xmm.vilspa.esa.es>
To: bjm@star.sr.bham.ac.uk
Subject: Re: calview psf problems (PR#7588)
Date: Mon Dec  2 09:07:23 2002
Dear Ben,

 I assume that you got these results with the latest available
calibration files. Indeed, I was able to reproduce them with a
very recently generated CIF file.

 I have transmitted your concerns to the EPIC Calibration Scientist
and our "calview" expert. I will come back to you, as soon as their
analysis is available.

 Best Regards,

 Matteo


Reply 2

Resend
From: Matteo Guainazzi <xmmhelp@xmm.vilspa.esa.es>
To: bjm@star.sr.bham.ac.uk
Subject: Re: calview psf problems (PR#7588)
Date: Mon Dec  2 17:16:56 2002
Dear Ben,

 the mapping of the CAL accuracy levels onto PSF models is described in
the calibration handbook:

  http://xmm.vilspa.esa.es/docs/documents/CAL-MAN-0001-2-1.ps.gz

In brevity:

  LOW     : single Gaussian (E+off-axis dependent)
  MEDIUM  : maps from SciSim simulations
  EXTENDED: Simona Ghizzardi's King-profile model (E+off-axis dependent)
  HIGH    : superposition of three-center Gaussians; off-axis but *NOT*
            E-dependent

 Indeed, the numbers for the XPSF CCF in the level LOW and MEDIUM are
very close.

 The HIGH-model is E-independent by definition and is defined only in
a small off-axis range [0, 300] arcsec. The former is a deficiency
of the model and the latter is simply due to the fact that too little
data were available at the time to fit to larger off-axis angles.

 The EXTENDED model is instead dependent on both energy and off-axis.
Both the 2-D PSF and the encircled energy fraction differ in facts
with energy and/or off-axis, if the latest calibration files are used.

 I hope this may help. Please, do not hesitate to ask further if
something is still not clear.

 Regards, Matteo


 

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