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From: miranda@physics.umanitoba.ca
Subject: what is the pn line at 8 keV?
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Date: Wed, 26 Apr 2006 21:04:11 GMT
From: miranda@physics.umanitoba.ca
To: xmmhelp@xmm.vilspa.esa.es
CC: miranda@physics.umanitoba.ca
Subject: what is the pn line at 8 keV?
Full_Name: Miranda Jackson
Submission from: (NULL) (130.179.72.213)


For an SNR observation (307130201) the pn and MOS spectra do not match each
other. This discrepancy appears in point sources and diffuse emission regions.
There is a strong sharp line in the pn spectrum at 8 keV which does not appear
in the MOS spectrum, and this appears in spectra from all regions, including the
chosen background region (as well as any other potential background region that
has been tried). When the background subtracted spectrum of point and diffuse
sources is viewed, the line still appears, meaning that it is not as strong in
the background, or is not being properly subtracted for some other reason. This
line appears also in another SNR observation (307130301), but it appears that
the line is properly subtacted with the background, indiating that it is
possibly instrumental in origin and not particular to one observation. Can you
please tell me the cause of this line and how I might go about properly
subtracting it? I have checked for pileup and both single and double events show
this same peak but there are not triple or quadruple events. I can give further
details if they are needed. Thanks.


Reply 1

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From: Pedro M. Rodriguez Pascual <xmmhelp@xmm.vilspa.esa.es>
To: miranda@physics.umanitoba.ca
Subject: Re: what is the pn line at 8 keV? (PR#21498)
Date: Thu Apr 27 06:58:33 2006
Dear Miranda, 

There are some EPIC-pn instrumental emission lines in the 8keV region; the
strongest being due to Cu. For a detailed description of the background in EPIC
cameras as well as some techniques and software to deal with it you may want to
have a look to the references in the following web page:

http://xmm.vilspa.esa.es/external/xmm_sw_cal/background/index.shtml

Sincerely, 

Pedro

> Full_Name: Miranda Jackson
> Submission from: (NULL) (130.179.72.213)
> 
> 
> For an SNR observation (307130201) the pn and MOS spectra do not match
each
> other. This discrepancy appears in point sources and diffuse emission
regions.
> There is a strong sharp line in the pn spectrum at 8 keV which does not
appear
> in the MOS spectrum, and this appears in spectra from all regions,
including
the
> chosen background region (as well as any other potential background region
that
> has been tried). When the background subtracted spectrum of point and
diffuse
> sources is viewed, the line still appears, meaning that it is not as strong
in
> the background, or is not being properly subtracted for some other reason.
This
> line appears also in another SNR observation (307130301), but it appears
that
> the line is properly subtacted with the background, indiating that it is
> possibly instrumental in origin and not particular to one observation. Can
you
> please tell me the cause of this line and how I might go about properly
> subtracting it? I have checked for pileup and both single and double events
show
> this same peak but there are not triple or quadruple events. I can give
further
> details if they are needed. Thanks.
> 
> 

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