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From: wangzx@shao.ac.cn
Subject: Resolving a possible line feature with XMM-Newton
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Date: Sun, 6 Oct 2019 03:51:54 +0200
From: wangzx@shao.ac.cn
To: xmmhelp@sciops.esa.int
Subject: Resolving a possible line feature with XMM-Newton
Full_Name: Zhongxiang Wang
Submission from: (NULL) (193.147.152.102)


Dear Helpdesk,
We see a possible emission line feature, with FWHM=0.141 keV at the energy of ~2
keV,
in the archival data for an interesting source from other telescope. We are 
considering to request an XMM observation to confirm the detection of the
feature. 

According to the XMM user handbook, Table 1 in Section 3.1 (also section 3.3.4),

the spectral resolutions of MOS and pn are 70 eV and 80 eV, respectively, at 1
keV. My
question is at 2 keV, could you confirm that we would likely resolve the line
feature? The table and and figures in the handbook were made based on results
in
early time of the XMM mission. We also try to know if there are any changes
(e.g.,
any significant degradation of the resolving power) after nearly 20 years?  

Thanks,
Zhongxiang Wang  


Reply 1

Resend
From: Nora Loiseau <xmmhelp@sciops.esa.int>
To: wangzx@shao.ac.cn
Subject: Re: Resolving a possible line feature with XMM-Newton (PR#85718)
Date: Mon Oct  7 15:51:26 2019
Dear Dr. Wang,

The evolution of the EPIC energy resolution using the onboard
calibration source lines are presented in Fig. 8 (page 14) of the EPIC
Status of Calibration and Data Analysis document
(http://xmm2.esac.esa.int/docs/documents/CAL-TN-0018.pdf).

The current line resolution at Al-K (1.8 keV) is about 80 eV for
EPIC-MOS (only single events PATTERN==0) and about 120 eV for EPIC-pn.

Best regards,

Nora


> 
> Dear Helpdesk,
> We see a possible emission line feature, with FWHM=0.141 keV at the energy
of
~2
> keV,
> in the archival data for an interesting source from other telescope. We are

> considering to request an XMM observation to confirm the detection of the
> feature. 
> 
> According to the XMM user handbook, Table 1 in Section 3.1 (also section
3.3.4),
> 
> the spectral resolutions of MOS and pn are 70 eV and 80 eV, respectively,
at
1
> keV. My
> question is at 2 keV, could you confirm that we would likely resolve the
line
> feature? The table and and figures in the handbook were made based on
results
> in
> early time of the XMM mission. We also try to know if there are any
changes
> (e.g.,
> any significant degradation of the resolving power) after nearly 20 years? 

> 
> Thanks,
> Zhongxiang Wang  
> 
> ----
Dr. Nora Loiseau
XMM-Newton User Support Group

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