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From: "Junjie Mao" <J.Mao@sron.nl>
Subject: Re: RGS spectrum with multiple source regions defined by
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Date: Tue, 28 Jun 2016 15:13:11 +0200
From: "Junjie Mao" <J.Mao@sron.nl>
To: "Rosario Gonzalez Riestra" <xmmhelp@sciops.esa.int>
Subject: Re: RGS spectrum with multiple source regions defined by
Dear Rosario, 

Thanks for your quick respond and the step-by-step recipe! It solves my
question. 

Kind regards,

Junjie
 
>>> Rosario Gonzalez Riestra <xmmhelp@sciops.esa.int> 06/28/2016
02:52
PM >>> 

Dear Junjie Mao

> I am working on the RGS data for extended source, groups/clusters of
galaxies,
> and I am
> trying to extract spectra from two rectangular source regions, say,
> xdspregions="-1.7 -0.3 0.3 1.7". The aim is to exclude the central
brightest
> region, which suffers from contamination of non thermal component
from
BCG/AGN.
> 
> However, I am encountering the following problem. It turns out the
spectrum I
> got was only counts from one source region (i.e. the first half
[-1.7, -0.3]
of
> the expression in xdspregions), the counts from the second source
region was
not
> included. 

If you define several rectangular regions, you will get several
separate
extraction regions and, when you eventually extract the spectra,
several
separate spectra (in this case, two). There is no way to merge them:
there will
be as many spectra as extraction regions defined.

> I looked into the source list file and found that there was an
> extension of RGS1_SRC3_SPATIAL (the first source region) and another
one for
> RGS1_SRC4_SPATIAL (the second source region, verified by extracting
the
region
> via tool cxctods9 and plot it with ds9 in dispersion - cross
dispersion
space).

That's right

> Note that in the SRCLIST extension I had 3 rows (PROPOSAL, ONAXIS and
USER,
the
> 3rd is introduce by myself), as expected. This also prevents me to
use
parameter
> like procsrcsexpr=...INDEX==3 & INDEX==4... since the source with
index=4 is not
> available.

This is true. You need to add sources to the list in order to extract
the
spectra.


> 
> So what went wrong and how do I get the a spectrum with counts from
both
source
> regions I defined?
> 

I am sending you in a separate message from my personal account the
detailed 
instructions of how to use this option.


Regards,

Rosario Gonzalez-Riestra
XMM-SOC User Support Group




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