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From: nevalaj@email.uah.edu
Subject: EPIC energy resolution
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3 replies: 1 2 3
1 followups: 1

Private message: yes  no

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Date: Tue, 26 Feb 2002 18:20:29 GMT
From: nevalaj@email.uah.edu
To: xmmhelp@xvsoc01.vilspa.esa.es
CC: nevalaj@email.uah.edu
Subject: EPIC energy resolution
Full_Name: Jukka Nevalainen
Submission from: (NULL) (146.229.9.129)


Is there documentation on the in-flight measurement of PN and MOS energy
resolution?
What are the mathematical expressions for the on-axis energy resolution as a
function 
of energy for MOS and PN?  

Reply 1

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: nevalaj@email.uah.edu
Subject: Re: EPIC energy resolution (PR#4720)
Date: Wed Feb 27 09:16:07 2002
Dear Jukka Nevalainen,

I am discussing your question with our EPIC calibration scientist and will
let you know his reply asap.

Cheers,
Matthias.


Reply 2

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: nevalaj@email.uah.edu
Subject: Re: EPIC energy resolution (PR#4720)
Date: Thu Feb 28 11:23:34 2002
Dear Jukka,

hereby I can inform you about the PN energy resolution
(I am still waiting to hear about MOS...you can already have a look at the 
XMM-Newton Users handbook, though):

There are no mathematical expressions for the energy resolution as a function 
of energy for PN. This is because we use the partial event model for the 
calculation of the detector response, which has as input just noise in
electrons.
There are however plots with FWHM vs energy (as it is derived from the current 
response matrices) in the XMM-Newton users handbook and in the proceedings paper

for the ESTEC conference by F. Haberl et al. 

I will send you this paper from my private email account as the helpdesk mail 
system does not handle attachments. (Please continue using the helpdesk account

for any further questions!).

Best regards,
Matthias.


Followup 1

Compose reply
Date: Thu, 28 Feb 2002 12:14:53 +0600 (GMT-6)
From: Jukka Nevalainen <nevalaj@email.uah.edu>
To: Matthias Ehle <xmmhelp@xvsoc01.vilspa.esa.es>
Subject: Re: EPIC energy resolution (PR#4720)
Thanks,

> There are no mathematical expressions for the energy resolution as a
function 
> of energy for PN. This is because we use the partial event model for the 
> calculation of the detector response, which has as input just noise in
> electrons.

But you can fit the data in the plots with analytical models to get a 
description of it. 

Do you think MOS has similar shoulder at < 0.5 keV as PN? At least in the 
handbook the preflight data indicated that only PN has this shoulder.


Jukka Nevalainen



Reply 3

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: nevalaj@email.uah.edu
Subject: Re: EPIC energy resolution (PR#4720)
Date: Mon Mar 11 12:21:25 2002
Dear Jukka,

you wrote
> 
> Do you think MOS has similar shoulder at < 0.5 keV as PN? At least in
the 
> handbook the preflight data indicated that only PN has this shoulder.
> 
> 
now I have received an answer from the MOS experts:

"The MOS response < 0.5 keV is certainly not representative
of a clean, isolated Gaussian.  Yes, we have shoulders, and in some CCDs
towards these lowest energies the 'shoulder' splits from, dominates, and
then totally replaces the main photopeak response."

If you wish to have a mathematical expression for energy resolution
which is *also* a function of time, we do not yet have this. If you require
an expression for the time-invariant resolution currently in the RMF, I
think we could provide this."

In addition I will send you a paper about the MOS in-flight measurements of
non-CTI corrected line width (section 4.1, 4.2, ADC units).  Of course,
these plots do not record the last 6 months of data.

I hope this is usefull for you.

Best regards,
Matthias.

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