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From: merritt@astro.gsu.edu
Subject: omsource pixel
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Date: Mon, 17 Dec 2018 19:49:07 +0100
From: merritt@astro.gsu.edu
To: xmmhelp@sciops.esa.int
Subject: omsource pixel
Full_Name: Rachael Merritt
Submission from: (NULL) (193.147.152.102)


Hello,
I am using omsource and I am slightly confused about the pixel size. I was
reading and in Kuntz et al 2008 they say 'the .native. pixel size is 0.476513'',
which is also what is says on XMMs instrument
description(https://xmm-tools.cosmos.esa.int/external/xmm_user_support/documentation/uhb/om.html)
 but at a different XMM website
(https://heasarc.gsfc.nasa.gov/docs/xmm/xmmhp_inst.html) it says that 'The
spatial pixel size in normal operation is 1 arc second'.
I would appreciate any insight you could provide regarding this matter.
Thank you.
Best,
Rachael Merritt


Reply 1

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From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: merritt@astro.gsu.edu
Subject: Re: omsource pixel (PR#84404)
Date: Mon Dec 17 22:54:31 2018
Dear Rachael,

The size of the OM pixel is indeed 0.476 arcsec. However, the instrument allows
for observations with different resolutions: high resolution, at the nominal
~0.5x0.5 arcsec pixel size, and low resolution, with a 2x2 binning and therefore
a pixel size of about 1 arcsec. You may find more details here:

https://xmm-tools.cosmos.esa.int/external/xmm_user_support/documentation/uhb/omdef.html

Best regards,
Jacobo
----------------------
Dr. Jacobo Ebrero
XMM-Newton SOC
User Support Group


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