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From: dr@star.sr.bham.ac.uk
Subject: PN timing mode energy resolution and spectral binning
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Date: Tue, 20 Apr 2004 14:56:12 GMT
From: dr@star.sr.bham.ac.uk
To: xmmhelp@xmm.vilspa.esa.es
CC: dr@star.sr.bham.ac.uk
Subject: PN timing mode energy resolution and spectral binning
Full_Name: Dan Reed
Submission from: (NULL) (147.188.32.208)


Hello

I am working on data from PN timing mode. I have extracted spectra using usual
techniques. I am using canned response matrices which means that the default
spectral bin has width of ~5eV. However, I need to rebin the spectrum in order
to oversample the FHWM of the energy resolution of the instrument by a factor of
three. I have your energy resolution diagram from the XMM users handbook but the
doubles resolution is considerably worse than the singles due to CTI. Is this
diagram old, if so, what energy resolution do you suggest I use given that I am
using both singles and doubles and using SAS 5.4.1, with all CCF updates prior
to the release of SAS 6.0. Furthermore, in order to oversample the FWHM of the
energy resolution by a factor 3 would you agree that this means that a spectral
bin needs to be 3*FWHM in width as opposed to the puny value of 5eV?

Thanks for any help you can give me.

Dan reed


Reply 1

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From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: dr@star.sr.bham.ac.uk
Subject: Re: PN timing mode energy resolution and spectral binning (PR#10711)
Date: Wed Apr 21 15:18:02 2004

Dear Dr. Reed


I have forwarded your question to our PN experts. I'll let you know as soon as I
hear from them.

Regards

                Rosario Gonzalez-Riestra
                XMM-SOC User Support Group
 


Reply 2

Resend
From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: dr@star.sr.bham.ac.uk
Subject: Re: PN timing mode energy resolution and spectral binning (PR#10711)
Date: Thu Apr 22 07:45:30 2004

Dear Dr. Reed

This is the answer from the PN experts:


> To first order the energy resolution in timing mode is consistent
> with that in full-frame mode. Since the fraction of doubles for timing mode
is

> relatively small I would recommend to use the resolution for singles given
in

> the UHB.
>
> To oversample the FWHM of the energy resolution by a factor 3
> in my view means FWHM/3 not 3*FWHM. I anyway would argue that
> rebinning should be done on statistical demands (to have a sufficiently
high
number > of counts in each bin to obey Gaussian statistics).



Regards,


            Rosario

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