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From: kiran lakhchaura <kiru111184@gmail.com>
Subject: Instrumental Al and Si lines seen in the background subtracted spectra
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Date: Tue, 12 Jul 2011 17:21:32 +0530
Subject: Instrumental Al and Si lines seen in the background subtracted spectra
From: kiran lakhchaura <kiru111184@gmail.com>
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
--bcaec5016347ced45504a7ddeb96
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--bcaec5016347ced45204a7ddeb94
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Dear Sir,

I have written about this problem to you earlier also.
This time I am sending all the commands used in generating the spectra and
am attaching all the relevant files required.

You can download all the fits files (in compressed state) from the links
given below :

http://www.esnips.com/doc/c8fc7d5a-218c-44ee-83a5-e73a07118109/mos1_blanksky_req0238_events.fits.tar
http://www.esnips.com/doc/83d3143b-5e49-4e8f-a6c4-0fa2c507d59b/mos2_blanksky_req0237_events.fits.tar
http://www.esnips.com/doc/c9fb21a5-f12f-42ec-bcec-68d23ba09d9b/pn_blanksky_req0239_events.fits.tar
http://www.esnips.com/doc/5aceb15f-5991-49d9-9123-0d871d62caa9/mos1S002-clean.fits.tar
http://www.esnips.com/doc/96d47e22-a189-48a2-8bbd-e9132a21f90b/mos2S005-clean.fits.tar
http://www.esnips.com/doc/cbd45fc1-a7b2-4249-876d-ec66c6628f9b/pnS003-clean.fits.tar
http://www.esnips.com/doc/000ed4b2-6599-4ba7-9fce-88a2055d2b30/mos1_filtered.fits.tar
http://www.esnips.com/doc/9bc1c717-b851-4a7b-bc15-883463f69542/mos2_filtered.fits.tar
http://www.esnips.com/doc/81e70309-340d-4e10-8dc4-33f478fd3153/pn_filtered.fits.tar

Details of these files are as follows :

1. mos1_blanksky_req0238_events.fits, mos1_blanksky_req0238_events.fits and
pn_blanksky_req0238_events.fits
are the blanksky background files originally received from
http://www.star.le.ac.uk/~jac48/BG/UserRequest/blankskyform.html

2. The files mos1S002-clean.fits, mos2S005-clean.fits amd pnS003-clean.fits
are the cleaned source observation event files
made by running mos-filter and pn-filter in the standard processing.

3. The files mos1_filtered.fits, mos2_filtered.fits and pn_filtered.fits are
the cleaned files after removing point sources.


The first three  files attached here are scripts described below. I request
you to please run these scripts (one by one in the order given below) and
make the output
files as some of the files are very big and each takes a lot of time to
upload.

1. 'blanksky_files_flare_filtering_script' is the script that was run to
filter the blanksky files

2. 'reprojection_scripts'  is the script that was run to reproject the
blanksky background files into source coordinates.

3. 'spectrum_script' is the script used to make the source and background
spectra, response matrices and group them together using 'grppha'.

The grouped spectral files from mos1, mos2 and pn detectors were then fitted
using the 'wabs*apec' model in xspec.
The second last file 'NW_circle1_fitted_spectrum.eps' is the fitted spectra
and the last files 'NW_circle1_fitted_spectrum.log' is the log file
obtained from the fitting.

My problem is that I am seeing the Al K-alpha line at 1.49 keV and Si
K-alpha line at 1.75 keV in these spectra which
should not have been there as the background and source spectra have been
generated from the same region from the same detectors
the lines should have been well subtracted with the background spectra.

This problem is particularly seen in the regions where the emission is very
weak and some of them the chi-square becomes do alrge that it's
not possible to even fit the spectra. I request you to please help me on
this as I am totally stuck with these lines.

I have asked this problem to some of the xspec people also, but they have
also directed me here.
I don't think fitting the lines using gaussian components in the model is a
good idea.

My main question is why at all am I seeing these lines after background
subtraction.



Regards,

-- 
Kiran
Research Scholar
DAA, TIFR,
Mumbai-05

--bcaec5016347ced45204a7ddeb94
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Dear Sir,<br><br>I have written about this problem to you earlier
also.<br>=
This time I am sending all the commands used in generating the spectra and =
am attaching all the relevant files required.<br><br>You can
download all t=
he fits files (in compressed state) from the links given below : <br>
<br><a href=3D"http://www.esnips.com/doc/c8fc7d5a-218c-44ee-83a5-e73a071181=
09/mos1_blanksky_req0238_events.fits.tar">http://www.esnips.com/doc/c8fc7d5=
a-218c-44ee-83a5-e73a07118109/mos1_blanksky_req0238_events.fits.tar</a><br>
<a href=3D"http://www.esnips.com/doc/83d3143b-5e49-4e8f-a6c4-0fa2c507d59b/m=
os2_blanksky_req0237_events.fits.tar">http://www.esnips.com/doc/83d3143b-5e=
49-4e8f-a6c4-0fa2c507d59b/mos2_blanksky_req0237_events.fits.tar</a><br><a
h=
ref=3D"http://www.esnips.com/doc/c9fb21a5-f12f-42ec-bcec-68d23ba09d9b/pn_bl=
anksky_req0239_events.fits.tar">http://www.esnips.com/doc/c9fb21a5-f12f-42e=
c-bcec-68d23ba09d9b/pn_blanksky_req0239_events.fits.tar</a><br>
<a href=3D"http://www.esnips.com/doc/5aceb15f-5991-49d9-9123-0d871d62caa9/m=
os1S002-clean.fits.tar">http://www.esnip

Message of length 89939 truncated

Reply 1

Resend
From: Nora Loiseau <xmmhelp@sciops.esa.int>
To: kiru111184@gmail.com
Subject: Re: Instrumental Al and Si lines seen in the background subtracted spectra (PR#48236)
Date: Tue Jul 12 12:26:23 2011
Dear Kiran,

we have passed your message to Dr. De La Calle, he will reply as soon as
possible,

Best regards,

Nora


> 
> Dear Sir,
> 
> I have written about this problem to you earlier also.
> This time I am sending all the commands used in generating the spectra and
> am attaching all the relevant files required.
> 
> You can download all the fits files (in compressed state) from the links
> given below :
> 
> http://www.esnips.com/doc/c8fc7d5a-218c-44ee-83a5-e73a07118109/mos1_blanksky_req0238_events.fits.tar
> http://www.esnips.com/doc/83d3143b-5e49-4e8f-a6c4-0fa2c507d59b/mos2_blanksky_req0237_events.fits.tar
> http://www.esnips.com/doc/c9fb21a5-f12f-42ec-bcec-68d23ba09d9b/pn_blanksky_req0239_events.fits.tar
> http://www.esnips.com/doc/5aceb15f-5991-49d9-9123-0d871d62caa9/mos1S002-clean.fits.tar
> http://www.esnips.com/doc/96d47e22-a189-48a2-8bbd-e9132a21f90b/mos2S005-clean.fits.tar
> http://www.esnips.com/doc/cbd45fc1-a7b2-4249-876d-ec66c6628f9b/pnS003-clean.fits.tar
> http://www.esnips.com/doc/000ed4b2-6599-4ba7-9fce-88a2055d2b30/mos1_filtered.fits.tar
> http://www.esnips.com/doc/9bc1c717-b851-4a7b-bc15-883463f69542/mos2_filtered.fits.tar
> http://www.esnips.com/doc/81e70309-340d-4e10-8dc4-33f478fd3153/pn_filtered.fits.tar
> 
> Details of these files are as follows :
> 
> 1. mos1_blanksky_req0238_events.fits, mos1_blanksky_req0238_events.fits
and
> pn_blanksky_req0238_events.fits
> are the blanksky background files originally received from
> http://www.star.le.ac.uk/~jac48/BG/UserRequest/blankskyform.html
> 
> 2. The files mos1S002-clean.fits, mos2S005-clean.fits amd
pnS003-clean.fits
> are the cleaned source observation event files
> made by running mos-filter and pn-filter in the standard processing.
> 
> 3. The files mos1_filtered.fits, mos2_filtered.fits and pn_filtered.fits
are
> the cleaned files after removing point sources.
> 
> 
> The first three  files attached here are scripts described below. I
request
> you to please run these scripts (one by one in the order given below) and
> make the output
> files as some of the files are very big and each takes a lot of time to
> upload.
> 
> 1. 'blanksky_files_flare_filtering_script' is the script that was run to
> filter the blanksky files
> 
> 2. 'reprojection_scripts'  is the script that was run to reproject the
> blanksky background files into source coordinates.
> 
> 3. 'spectrum_script' is the script used to make the source and background
> spectra, response matrices and group them together using 'grppha'.
> 
> The grouped spectral files from mos1, mos2 and pn detectors were then
fitted
> using the 'wabs*apec' model in xspec.
> The second last file 'NW_circle1_fitted_spectrum.eps' is the fitted
spectra
> and the last files 'NW_circle1_fitted_spectrum.log' is the log file
> obtained from the fitting.
> 
> My problem is that I am seeing the Al K-alpha line at 1.49 keV and Si
> K-alpha line at 1.75 keV in these spectra which
> should not have been there as the background and source spectra have been
> generated from the same region from the same detectors
> the lines should have been well subtracted with the background spectra.
> 
> This problem is particularly seen in the regions where the emission is
very
> weak and some of them the chi-square becomes do alrge that it's
> not possible to even fit the spectra. I request you to please help me on
> this as I am totally stuck with these lines.
> 
> I have asked this problem to some of the xspec people also, but they have
> also directed me here.
> I don't think fitting the lines using gaussian components in the model is
a
> good idea.
> 
> My main question is why at all am I seeing these lines after background
> subtraction.
> 
> 
> 
> Regards,
> 
> -- 
> Kiran
> Research Scholar
> DAA, TIFR,
> Mumbai-05
> 
> --bcaec5016347ced45204a7ddeb94
> Content-Type: text/html; charset=ISO-8859-1
> Content-Transfer-Encoding: quoted-printable
> 
> Dear Sir,<br><br>I have written about this problem to you
earlier also.<br>=
> This time I am sending all the commands used in generating the spectra and
=
> am attaching all the relevant files required.<br><br>You can
download all t=
> he fits files (in compressed state) from the links given below :
<br>
> <br><a
href=3D"http://www.esnips.com/doc/c8fc7d5a-218c-44ee-83a5-e73a071181=
> 09/mos1_blanksky_req0238_events.fits.tar">http://www.esnips.com/doc/c8fc7d5=
> a-218c-44ee-83a5-e73a07118109/mos1_blanksky_req0238_events.fits.tar</a><br>
> <a href=3D"http://www.esnips.com/doc/83d3143b-5e49-4e8f-a6c4-0fa2c507d59b/m=
&

Message of length 97188 truncated


Reply 2

Resend
From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: kiru111184@gmail.com
Subject: Re: Instrumental Al and Si lines seen in the background subtracted spectra (PR#48236)
Date: Mon Jul 25 12:42:58 2011
Dear Kiran,

I understand that this question has been answered in ticket number
48200, am I correct ?

Regards,

Ignacio de la Calle
XMM-Newton SOC

> --bcaec5016347ced45504a7ddeb96
> Content-Type: multipart/alternative; boundary=bcaec5016347ced45204a7ddeb94
> 
> --bcaec5016347ced45204a7ddeb94
> Content-Type: text/plain; charset=ISO-8859-1
> 
> Dear Sir,
> 
> I have written about this problem to you earlier also.
> This time I am sending all the commands used in generating the spectra and
> am attaching all the relevant files required.
> 
> You can download all the fits files (in compressed state) from the links
> given below :
> 
> http://www.esnips.com/doc/c8fc7d5a-218c-44ee-83a5-e73a07118109/mos1_blanksky_req0238_events.fits.tar
> http://www.esnips.com/doc/83d3143b-5e49-4e8f-a6c4-0fa2c507d59b/mos2_blanksky_req0237_events.fits.tar
> http://www.esnips.com/doc/c9fb21a5-f12f-42ec-bcec-68d23ba09d9b/pn_blanksky_req0239_events.fits.tar
> http://www.esnips.com/doc/5aceb15f-5991-49d9-9123-0d871d62caa9/mos1S002-clean.fits.tar
> http://www.esnips.com/doc/96d47e22-a189-48a2-8bbd-e9132a21f90b/mos2S005-clean.fits.tar
> http://www.esnips.com/doc/cbd45fc1-a7b2-4249-876d-ec66c6628f9b/pnS003-clean.fits.tar
> http://www.esnips.com/doc/000ed4b2-6599-4ba7-9fce-88a2055d2b30/mos1_filtered.fits.tar
> http://www.esnips.com/doc/9bc1c717-b851-4a7b-bc15-883463f69542/mos2_filtered.fits.tar
> http://www.esnips.com/doc/81e70309-340d-4e10-8dc4-33f478fd3153/pn_filtered.fits.tar
> 
> Details of these files are as follows :
> 
> 1. mos1_blanksky_req0238_events.fits, mos1_blanksky_req0238_events.fits
and
> pn_blanksky_req0238_events.fits
> are the blanksky background files originally received from
> http://www.star.le.ac.uk/~jac48/BG/UserRequest/blankskyform.html
> 
> 2. The files mos1S002-clean.fits, mos2S005-clean.fits amd
pnS003-clean.fits
> are the cleaned source observation event files
> made by running mos-filter and pn-filter in the standard processing.
> 
> 3. The files mos1_filtered.fits, mos2_filtered.fits and pn_filtered.fits
are
> the cleaned files after removing point sources.
> 
> 
> The first three  files attached here are scripts described below. I
request
> you to please run these scripts (one by one in the order given below) and
> make the output
> files as some of the files are very big and each takes a lot of time to
> upload.
> 
> 1. 'blanksky_files_flare_filtering_script' is the script that was run to
> filter the blanksky files
> 
> 2. 'reprojection_scripts'  is the script that was run to reproject the
> blanksky background files into source coordinates.
> 
> 3. 'spectrum_script' is the script used to make the source and background
> spectra, response matrices and group them together using 'grppha'.
> 
> The grouped spectral files from mos1, mos2 and pn detectors were then
fitted
> using the 'wabs*apec' model in xspec.
> The second last file 'NW_circle1_fitted_spectrum.eps' is the fitted
spectra
> and the last files 'NW_circle1_fitted_spectrum.log' is the log file
> obtained from the fitting.
> 
> My problem is that I am seeing the Al K-alpha line at 1.49 keV and Si
> K-alpha line at 1.75 keV in these spectra which
> should not have been there as the background and source spectra have been
> generated from the same region from the same detectors
> the lines should have been well subtracted with the background spectra.
> 
> This problem is particularly seen in the regions where the emission is
very
> weak and some of them the chi-square becomes do alrge that it's
> not possible to even fit the spectra. I request you to please help me on
> this as I am totally stuck with these lines.
> 
> I have asked this problem to some of the xspec people also, but they have
> also directed me here.
> I don't think fitting the lines using gaussian components in the model is
a
> good idea.
> 
> My main question is why at all am I seeing these lines after background
> subtraction.
> 
> 
> 
> Regards,
> 
> -- 
> Kiran
> Research Scholar
> DAA, TIFR,
> Mumbai-05
> 
> --bcaec5016347ced45204a7ddeb94
> Content-Type: text/html; charset=ISO-8859-1
> Content-Transfer-Encoding: quoted-printable
> 
> Dear Sir,<br><br>I have written about this problem to you
earlier also.<br>=
> This time I am sending all the commands used in generating the spectra and
=
> am attaching all the relevant files required.<br><br>You can
download all t=
> he fits files (in compressed state) from the links given below :
<br>
> <br><a
href=3D"http://www.esnips.com/doc/c8fc7d5a-218c-44ee-83a5-e73a071181=
> 09/mos1_blanksky_r

Message of length 97379 truncated

Up to top level
AO15   AO16   AO17   AO18   AO19   Backgrounds   Calibration   Conference   Data   Docs   EPICMOS   EPICpn   Feedback   Gallery   Misc   OM   Pending   PhD_Theses   Publications   RGS   RadMonitor   SAS_Hardware   SAS_WS   SASv16.0   SASv16.0_Installation   SASv16.1   SASv16.1_Installation   SASv17.0   SASv17.0_Installation   SASv18.0   SASv18.0_Installation   SciSim   Simulators_other   Suggestions   Trash   Visibility   XMM-bouncing   XMM-news   XRPS   XSA   esas   incoming  

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