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From: Christopher Dessert <dessert@umich.edu>
Subject: Extracting source around its PSF
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From: Christopher Dessert <dessert@umich.edu>
Date: Mon, 11 Feb 2019 00:04:37 -0500
Subject: Extracting source around its PSF
To: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
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Hi,

I am trying to extract a point source. I have obtained the point source
image by following
https://www.cosmos.esa.int/web/xmm-newton/sas-thread-2dpsf-amr on the
command line. Apologizies if this is mentioned elsewhere, but how do I go
from the PSF image to actually extracting the source using the PSF image? I
would like to be slightly more accurate than just a circle.

Thanks,

Chris

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<div dir=3D"ltr"><div
dir=3D"ltr"><div>Hi,</div><div><br></div><div>I
am tr=
ying to extract a point source. I have obtained the point source image by f=
ollowing <a href=3D"https://www.cosmos.esa.int/web/xmm-newton/sas-thread-2d=
psf-amr">https://www.cosmos.esa.int/web/xmm-newton/sas-thread-2dpsf-amr</a>=
 on the command line. Apologizies if this is mentioned elsewhere, but how d=
o I go from the PSF image to actually extracting the source using the PSF i=
mage? I would like to be slightly more accurate than just a circle.
<br></d=
iv><div><br></div><div>Thanks,</div><div><br></div><div>Chris<br></div></di=
v></div>

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Reply 1

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From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: dessert@umich.edu
Subject: Re: Extracting source around its PSF (PR#84634)
Date: Mon Feb 11 11:34:37 2019
Dear Chris,

The 2-D PSF generation procedure was created recently to allow the user to use a
customized PSF for source extraction. Unfortunately, the tool that may allow to
go from the user-generated PSF image to the actual source extraction is not
developed yet (it may be incorporated in future versions of SAS).

As an alternative, if your point source is off-axis, using an ellipse instead of
a circle works quite well. You may use the task eregionanalyse:

https://xmm-tools.cosmos.esa.int/external/sas/current/doc/eregionanalyse/index.html

to get the actual ellipse parameters for the location of your source.

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

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