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From: fabio@physics.technion.ac.il
Subject: RGS extraction regions
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Date: Sat, 18 Sep 2004 13:02:31 GMT
From: fabio@physics.technion.ac.il
To: xmmhelp@xmm.vilspa.esa.es
CC: fabio@physics.technion.ac.il
Subject: RGS extraction regions
Full_Name: Fabio Pizzolato
Submission from: (NULL) (132.68.1.29)


Dear Helpdesk,

I have some problems in reducing the RGS observation
of the starburst galaxy NGC253 (ObsId 0125960101).
First I run rgsproc (with its default parameters).

The troubles start when I examine the products.
Namely, when I issue the command  rgsimplot  to
draw  the banana plot and the dispersion-crossdispersion
diagrams, the first looks OK, but no source is to be found on the
second one. This occurs for both RGS1 and RGS2.
As a consequence, of course, the extracted spectrum (SRSPEC) has much less
counts than the background  (BGSPEC). My  SAS version is 6.0.0.

The coordinates of the source reduced by rgsproc are correct.

I have the  same problem also with other observations
(e.g. ObsId 0125960201).  Am I doing something wrong?

Thank you very much for your help!

Fabio



Reply 1

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: fabio@physics.technion.ac.il
Subject: Re: RGS extraction regions (PR#16222)
Date: Mon Sep 20 08:25:46 2004
Dear Fabio,

I have forwarded your question to our RGS SAS experts.
You will get results of their analysis as soon as possible.

Cheers,
        Matthias

        Matthias Ehle 
        XMM-Newton User Support Group


Reply 2

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From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: fabio@physics.technion.ac.il
Subject: Re: RGS extraction regions (PR#16222)
Date: Tue Sep 21 08:38:46 2004

Dear Dr. Pizzolato,

I have been examining the data of NGC 253 that you mention in your message
(obsid 0125960101).

I have first run 'rgsproc' with the default parameters, which take as default
position for the extraction of the spectrum the coordinates enteres in the
proposal, that are in this case R.A.=00 47 37.0, Dec. -25 18 00.
After running 'rgsproc' and 'rgsimplot' I see that, as you describe in your
mail, there is a spectrum visible in the 'banana' space. 
If one looks carefully there is also an excess emission in the spatial image,
centered approximately at xdsp_corr=-3.E-4. It is difficult to see, but note
that this is a very extended object.

When using the default coordinates, the extraction region in the spatial image
in centered around  xdsp_corr=0, and therefore this region of maximum emission
is out of the extraction region.

I have then run 'rgsproc' using the SIMBAD coordinates of NGC 253 (00 47 33.13,
-25 17 17.8), and then the spatial extraction region is displaced to negative
values of xdsp_corr, and threrfore the emission area is included.

I hope this answer your question. 

Regards,

                      Rosario Gonzalez-Riestra
                      XMM-SOC User Support Group

P.S.  You can look to the 'RGS analysis threads' for more details:

http://xmm.vilspa.esa.es/sas/documentation/threads/rgs_thread.html
http://xmm.vilspa.esa.es/sas/documentation/threads/rgs_thread_2.html


                     


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