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From: cocj@roe.ac.uk
Subject: weighted exposure maps
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Date: Fri, 30 May 2003 15:03:53 GMT
From: cocj@roe.ac.uk
To: xmmhelp@xmm.vilspa.esa.es
CC: cocj@roe.ac.uk
Subject: weighted exposure maps
Full_Name: Olivia Johnson
Submission from: (NULL) (195.194.120.192)


Hi, 

  This is a follow-up to helpdesk ticket #8562, in which I asked how to properly

account for the variable response of different detectors when combining MOS and
pn 
exposure maps.  The reply I received was:

> Dear Olivia,
> 
>  the different effective areas of the detectors are not automatically
> taken into account when exposure maps of different instrumentse are
> merged, as their units are - as you have noticed - seconds. One needs
> to weight the exposure maps for the effective area of each detector
> in the energy band, where the exposure maps have been calculated. The
> weights need to be calculated manually (i.e., there is no SAS tool for
> it). The corresponding numbers can be extracted from the User Handbook,
> or from an effective area file.
> 
>  Regards,
> 
>  Matteo Guainazzi
>  XMM-Newton Science Operations Center
>  User Support Group

My additional questions are: 1) Can the properly weighted exposure map and image

then be fed to the detect chain as if it were a single image? and 2) Could you
point 
me toward the specific section of the Handbook or EA files which contain the
data
for weighting the exposure maps.  I can only find plots in the handbook, and the

EA files in the CCF seem to include only mirror EA, and not detector QE + filter

transmission.  

Thank you,
Olivia


Reply 1

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From: Matteo Guainazzi <xmmhelp@xmm.vilspa.esa.es>
To: cocj@roe.ac.uk
Subject: Re: weighted exposure maps (PR#8669)
Date: Tue Jun  3 16:26:22 2003
Dear Olivia,

1. weighted exposure maps can be used as "standard" exposure maps

2. there is no CCF component, which contains the mirror+detector
   effective area. This has to be generated via the SAS tasks
   "rmfgen" and "arfgen". My suggestion is to generate appropriate
   response files, corresponding to your region of interest, and
   use them as a source for the weighting factor.

 Regards, Matteo

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