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From: miranda@physics.umanitoba.ca
Subject: trouble with a spectrum extracted from multiple point source regions
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Date: Mon, 8 Sep 2008 18:22:16 GMT
From: miranda@physics.umanitoba.ca
To: xmmhelp@sciops.esa.int
Cc: miranda@physics.umanitoba.ca
Subject: trouble with a spectrum extracted from multiple point source regions
Full_Name: MIranda Jackson
Submission from: (NULL) (130.179.72.213)


I have extracted a spectrum from a large number of small circles within a larger
circle in PN and MOS data, in order to determine the flux contribution from all
of the resolved point sources within the region. The selection expression makes
reference to a FITS region file including all of the small circles, and I hope I
have made it so it is a union among all of those circles rather than an
intersection, but I'm not sure about that, though it didn't say that there were
zero events in the file when it was produced. When I try to read the spectrum in
with Xspec, after making the other files and setting the appropriate keywords
(BACKFILE, etc), I get the following errors:

***Warning: Data file obs2pnptsrcspec.grp has invalid BACKSCAL value = 0.0.
    XSPEC will instead use 1.0.
Warning: RMF CHANTYPE keyword is not consistent with spectrum

***XSPEC Error: Background file pnbackobs2.pi DETCHANS do not match data file.

Please let me know what I can check in the spectrum file to make sure it was
extracted properly, and what I have to do with backscale, rmfgen, and arfgen
(special command line parameters, etc.) to be able to read this spectrum into
Xspec.

Thanks.



Reply 1

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From: Maria Diaz Trigo <xmmhelp@sciops.esa.int>
To: miranda@physics.umanitoba.ca
Subject: Re: trouble with a spectrum extracted from multiple point source regions (PR#38318)
Date: Tue Sep  9 06:54:43 2008
Dear Miranda,

could you please send us the region file that you have used to extract your
spectrum?
With this we can tell you already if the region is correct or not.

Best regards,

Maria

Maria Diaz Trigo
XMM-Newton SOC

> Full_Name: MIranda Jackson
> Submission from: (NULL) (130.179.72.213)
> 
> 
> I have extracted a spectrum from a large number of small circles within a
larger
> circle in PN and MOS data, in order to determine the flux contribution from
all
> of the resolved point sources within the region. The selection expression
makes
> reference to a FITS region file including all of the small circles, and I
hope
I
> have made it so it is a union among all of those circles rather than an
> intersection, but I'm not sure about that, though it didn't say that there
were
> zero events in the file when it was produced. When I try to read the
spectrum
in
> with Xspec, after making the other files and setting the appropriate
keywords
> (BACKFILE, etc), I get the following errors:
> 
> ***Warning: Data file obs2pnptsrcspec.grp has invalid BACKSCAL value =
0.0.
>     XSPEC will instead use 1.0.
> Warning: RMF CHANTYPE keyword is not consistent with spectrum
> 
> ***XSPEC Error: Background file pnbackobs2.pi DETCHANS do not match data
file.
> 
> Please let me know what I can check in the spectrum file to make sure it
was
> extracted properly, and what I have to do with backscale, rmfgen, and
arfgen
> (special command line parameters, etc.) to be able to read this spectrum
into
> Xspec.
> 
> Thanks.
> 
> 
> 

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