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From: Jaewoong Jung <jjung11@alaska.edu>
Subject: Re: evqpb spectrum doesn't match with sciece spectrum (%2%555%2)
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From: Jaewoong Jung <jjung11@alaska.edu>
Date: Thu, 8 Aug 2019 00:58:01 -0800
Subject: Re: evqpb spectrum doesn't match with sciece spectrum (%2%555%2)
To: Jacobo Ebrero <xmmhelp@sciops.esa.int>
--000000000000f559a6058f9741b8
Content-Type: text/plain; charset="UTF-8"

Dear Jacobo,

I'm not sure I understood it correctly.
When Xspec says following,

Spectral Data File: MOS1spec.fits
 Assigned to Data Group 1 and Plot Group 1
Net count rate (cts/s) for Spectrum:1  8.787e-03 +/- 2.833e-03 (10.5 % total)
 Spectral data counts: 961
 Model predicted rate: 0.0

I think what it means is 'science-QPB' is 10% of the science spectrum,
not that QPB is 10% of the spectrum.

Can you explain this further for me please?


Best,

Jaewoong



On Thu, Aug 8, 2019 at 12:09 AM Jacobo Ebrero <xmmhelp@sciops.esa.int>
wrote:

> Dear Jaewoong,
>
> Your analysis seems to be right and the result looks reasonable too. The
> QPB is
> typically more or less constant and it is expected (although it may vary
> from
> one observation to another) to be of the order of 10%. Estimations vary
> but you
> can find some here:
>
>
> https://xmm-tools.cosmos.esa.int/external/xmm_user_support/documentation/uhb/epicintbkgd.html
>
> or here:
>
> https://www.cosmos.esa.int/web/xmm-newton/epic-background-components
>
> Best regards,
> Jacobo
>
> ----------------------
> Dr. Jacobo Ebrero
> XMM-Newton SOC
> Community Support and Scientific Planning Team
>
> This message is intended only for the recipient(s) named above. It may
> contain proprietary information and/or
> protected content. Any unauthorised disclosure, use, retention or
> dissemination is prohibited. If you have received
> this e-mail in error, please notify the sender immediately. ESA applies
> appropriate organisational measures to protect
> personal data, in case of data privacy queries, please contact the ESA
> Data Protection Officer (dpo@esa.int).
>
>
>

--000000000000f559a6058f9741b8
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear
Jacobo,<div><br></div><div>I&#39;m not sure I
underst=
ood it correctly.</div><div>When Xspec says
following,</div><div><br></div>=
<div><pre style=3D"color:rgb(0,0,0)">Spectral Data File:
MOS1spec.fits
 Assigned to Data Group 1 and Plot Group 1
Net count rate (cts/s) for Spectrum:1  8.787e-03 +/- 2.833e-03 (10.5 % tota=
l)
 Spectral data counts: 961
 Model predicted rate: 0.0</pre><pre style=3D"color:rgb(0,0,0)">I
think wha=
t it means is &#39;science-QPB&#39; is 10% of the science spectrum, not
tha=
t QPB is 10% of the spectrum.</pre><pre
style=3D"color:rgb(0,0,0)">Can you =
explain this further for me please?</pre><pre
style=3D"color:rgb(0,0,0)"><b=
r></pre><pre style=3D"color:rgb(0,0,0)">Best,</pre><pre
style=3D"color:rgb(=
0,0,0)">Jaewoong</pre><pre
style=3D"color:rgb(0,0,0)"><br></pre></div></div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr"
class=3D"gmail_attr">On Th=
u, Aug 8, 2019 at 12:09 AM Jacobo Ebrero &lt;<a
href=3D"mailto:xmmhelp@scio=
ps.esa.int">xmmhelp@sciops.esa.int</a>&gt;
wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex">Dear Jaewoong,<br>
<br>
Your analysis seems to be right and the result looks reasonable too. The QP=
B is<br>
typically more or less constant and it is expected (although it may vary fr=
om<br>
one observation to another) to be of the order of 10%. Estimations vary but=
 you<br>
can find some here:<br>
<br>
<a href=3D"https://xmm-tools.cosmos.esa.int/external/xmm_user_support/docum=
entation/uhb/epicintbkgd.html" rel=3D"noreferrer" target=3D"_blank">https:/=
/xmm-tools.cosmos.esa.int/external/xmm_user_support/documentation/uhb/epici=
ntbkgd.html</a><br>
<br>
or here:<br>
<br>
<a href=3D"https://www.cosmos.esa.int/web/xmm-newton/epic-background-compon=
ents" rel=3D"noreferrer" target=3D"_blank">https://www.cosmos.esa.int/web/x=
mm-newton/epic-background-components</a><br>
<br>
Best regards,<br>
Jacobo<br>
<br>
----------------------<br>
Dr. Jacobo Ebrero<br>
XMM-Newton SOC<br>
Community Support and Scientific Planning Team<br>
<br>
This message is intended only for the recipient(s) named above. It may cont=
ain proprietary information and/or<br>
protected content. Any unauthorised disclosure, use, retention or dissemina=
tion is prohibited. If you have received<br>
this e-mail in error, please notify the sender immediately. ESA applies app=
ropriate organisational measures to protect<br>
personal data, in case of data privacy queries, please contact the ESA Data=
 Protection Officer (<a href=3D"mailto:dpo@esa.int"
target=3D"_blank"&

Message of length 5128 truncated

Reply 1

Resend
From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: jjung11@alaska.edu
Subject: Re: evqpb spectrum doesn't match with sciece spectrum (%2%2U55252529292828%2%555%2)
Date: Thu Aug  8 13:06:31 2019
Dear Jaewoong,

Sorry I didn't noticed that. As you see, the Xspec output is the "net" count
rate. This means it is already background substracted. The uncertainties quoted
there might be the statistical errors in your count rate (i.e. the propagated
error from the error in each count rate bin).

Regards,
Jacobo



----------------------
Dr. Jacobo Ebrero
XMM-Newton SOC
Community Support and Scientific Planning Team

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