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From: Dominique.Eckert@unige.ch
Subject: Units of psfgen output image
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Date: Tue, 7 Mar 2017 16:01:52 GMT
From: Dominique.Eckert@unige.ch
To: xmmhelp@sciops.esa.int
CC: Dominique.Eckert@unige.ch
Subject: Units of psfgen output image
Full_Name: Dominique Eckert
Submission from: (NULL) (129.194.8.73)


Dear colleagues,

I would like to use psfgen to create PSF images for detected sources and compare
them with observed images. To this aim, I convert RA, Dec of my source into
detector coordinates using ecoordconv and then apply psfgen using the syntax

psfgen region='(DETX,DETY) IN circle(x,y,rad)' [...]

This appears to work well, however it is not mentioned what is the pixel size of
the output image. I obviously need this information for a thorough comparison of
PSF profiles with source profiles. Can you please tell me what is the pixel size
of the output image?

Thank you in advance,
Dominique


Reply 1

Resend
From: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
To: Dominique.Eckert@unige.ch
Subject: Re: Units of psfgen output image (PR#81098)
Date: Wed Mar  8 09:33:16 2017
Dear Dominique,

 does this table in the package description answer your questions?
https://xmm-tools.cosmos.esa.int/external/sas/current/doc/ecoordconv/node3.html

 Regards,
Jan-Uwe

> Dear colleagues,
> 
> I would like to use psfgen to create PSF images for detected sources and
compare
> them with observed images. To this aim, I convert RA, Dec of my source
into
> detector coordinates using ecoordconv and then apply psfgen using the
syntax
> 
> psfgen region='(DETX,DETY) IN circle(x,y,rad)' [...]
> 
> This appears to work well, however it is not mentioned what is the pixel
size
of
> the output image. I obviously need this information for a thorough
comparison
of
> PSF profiles with source profiles. Can you please tell me what is the pixel
size
> of the output image?
> 
> Thank you in advance,
> Dominique
> 
> 


Followup 1

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From: Dominique Eckert <Dominique.Eckert@unige.ch>
To: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
Subject: Re: Units of psfgen output image (PR#81098)
Date: Wed, 8 Mar 2017 09:40:13 +0000
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Reply 2

Resend
From: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
To: Dominique.Eckert@unige.ch
Subject: Re: Units of psfgen output image (PR#81098)
Date: Wed Mar  8 21:20:12 2017
Hi Dominique,

 after consulting a developer, the output pixel size is 1" by 1" (20x20 DET
pixels).

You can make the image bigger using the xsize, ysize parameters but the pixel
resolution remains the same. Use fimgbin to rebin it if necessary.

Best wishes,
Jan-Uwe


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Subject: Re: Units of psfgen output image (PR#81098)
To: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
From: Dominique Eckert <Dominique.Eckert@unige.ch>
Date: Thu, 9 Mar 2017 09:20:00 +0100
Hi Jan-Uwe,

Thank you for the answer, this is the information I needed. I guess it 
would be good if this information were included in the documentation of 
psfgen.

Cheers,

Dominique



Le 08. 03. 17 . 22:20, Jan-Uwe Ness a .crit :
> Hi Dominique,
>
>   after consulting a developer, the output pixel size is 1" by 1" (20x20
DET
> pixels).
>
> You can make the image bigger using the xsize, ysize parameters but the
pixel
> resolution remains the same. Use fimgbin to rebin it if necessary.
>
> Best wishes,
> Jan-Uwe
>
>
> This message and any attachments are intended for the use of the addressee
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> The unauthorised disclosure, use, dissemination or copying (either in whole
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> If you received this message in error, please notify the sender and delete
it from your system.
> Emails can be altered and their integrity cannot be guaranteed by the
sender.
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> Please consider the environment before printing this email.
>
>



Reply 3

Resend
From: Jan-Uwe Ness <xmmhelp@sciops.esa.int>
To: Dominique.Eckert@unige.ch
Subject: Re: Units of psfgen output image (PR#81098)
Date: Thu Mar  9 08:52:13 2017
Hi Dominique, great this helps. Of course, I have already requested the
documentation to include this information.

 Best wishes,
Jan-Uwe


> Hi Jan-Uwe,
> 
> Thank you for the answer, this is the information I needed. I guess it 
> would be good if this information were included in the documentation of 
> psfgen.
> 
> Cheers,
> 
> Dominique
> 
> 
> 
> Le 08. 03. 17 . 22:20, Jan-Uwe Ness a .crit :
>> Hi Dominique,
>>
>>   after consulting a developer, the output pixel size is 1" by 1"
(20x20 DET
>> pixels).
>>
>> You can make the image bigger using the xsize, ysize parameters but the
pixel
>> resolution remains the same. Use fimgbin to rebin it if necessary.
>>
>> Best wishes,
>> Jan-Uwe

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