Viewing RGS/49942
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Date: Thu, 12 Apr 2012 13:45:55 -0400
Subject: Response Matrices
From: shokoofeh nourbakhsh <snourbak@uwo.ca>
To: xmmhelp@sciops.esa.int

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Dear Sir/Madam

I want to measure the line width of different elements from RGS spectrum
and for that purpose I need to know how the line spread function affects my
data. I am aware that XSPEC use response matrices to account of LSF and
other correction but I do not want to modelling to get the width. Is there
any other way to visualize response matrices to see how it varies by energy
for detection of my source?

Thanks for your consideration
Shokoofeh Nourbakhsh

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Dear Sir/Madam<div><br></div><div>I want to measure the
line width of diffe=
rent elements from RGS spectrum and for that purpose I need to know how the=
 line spread function affects my data. I am aware that XSPEC use response m=
atrices to account of LSF and other correction but I do not want to modelli=
ng to get the width. Is there any other way to visualize response matrices =
to see how it varies by energy for detection of my source? =A0</div>
<div><br></div><div>Thanks for your
consideration</div><div>Shokoofeh Nourb=
akhsh</div>

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Reply 1

From: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
To: snourbak@uwo.ca
Subject: Re: Response Matrices (PR#49942)
Date: Tue Apr 17 07:45:38 2012

Dear Shokoofeh Nourbakhsh,

 we apologize for the long delay in answering your question. Last week, we had a
hacker attack that forced us to disable various systems including the helpdesk
until all issues were investigated and resolved. We only received your question
now.

 As you already suspect, the standard way to assess the width of a line would be
modelling with xspec. If you use a Gaussian model with zero line width, you will
see the instrumental contribution to the line width as recorded in the response
file. You can then judge whether there is any additional line broadening and
quantify that by increasing the line width of the model.

 Other than that you could use the SAS tool calview
http://xmm.esac.esa.int/sas/current/doc/calview/index.html
to visualize the calibration state for all instruments including the RGS. Under
'View' in the graphical user interface, you can display the dispersed PSF.

 Best wishes,
Jan-Uwe


> Dear Sir/Madam
> 
> I want to measure the line width of different elements from RGS spectrum
> and for that purpose I need to know how the line spread function affects
my
> data. I am aware that XSPEC use response matrices to account of LSF and
> other correction but I do not want to modelling to get the width. Is there
> any other way to visualize response matrices to see how it varies by
energy
> for detection of my source?
> 
> Thanks for your consideration
> Shokoofeh Nourbakhsh
>