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From: Juan Pradas <jpradas@astro.uni-bonn.de>
Subject: bright CCDs and quota
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Date: Fri, 28 Jan 2005 17:22:58 +0100
From: Juan Pradas <jpradas@astro.uni-bonn.de>
Subject: bright CCDs and quota
To: xmmhelp@xmm.vilspa.esa.es
This is a multi-part message in MIME format.
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Dear Sirs,

I have been working on the development of exposure maps for the MOS 
detectors based on the in-flight performance (similart to Read & Ponman 
2003). For this purpose, I have been making use of multiple pointed 
observations extracted from the data archive. I have found a so far 
unreported "contamination" in CCDs 2 and 5 of MOS1 which appears 
systematically in about 50% and 20% of the observations respectively. 
The "contamination" consists of an artificial background intensity 
enhancement (about a factor of two or more above the cosmic background 
with respect to the other chips) in the 200 to 500 eV energy band. This 
results in "bright CCDs" as you can see in the three example images, 
attached to this e-mail. The images have been calibrated, flare-filtered 
and individual source are subtracted, finally they had been binned to 
about 5 PSF angular resolution. Do you have additional information on 
the origin of this bright CCDs or how to overcome them? I would also 
like to extend my analysis to other configurations of the telescope 
(until now I analysed only medium filter fullframe mode observation) and 
therefore a temporary higher disk quota for the archive would be very 
useful for me.  Is this possible?

Thank you very much in advance. Looking forward hearing from you soon.

Best regards

Juan Pradas

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Message of length 80394 truncated

Reply 1

Resend
From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: jpradas@astro.uni-bonn.de
Subject: Re: bright CCDs and quota (PR#16999)
Date: Fri Jan 28 15:59:46 2005

Dear Dr. Pradas

Thanks for your message.

I have forwarded it to the EPIC Calibration Scientist. I'll let you know as soon
as I get his answer.

Regards

               Rosario Gonzalez-Riestra
               XMM-SOC User Support Group



Reply 2

Resend
From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: jpradas@astro.uni-bonn.de
Subject: Re: bright CCDs and quota (PR#16999)
Date: Fri Jan 28 17:31:10 2005

Dear Dr. Pradas,

First of all, your XSA quota has been increased. Please let us know if this is
enough or if you need more space.

As for the problem you report, it is already known by the calibration team and
it is under investigation.

I'll let you know if there are some news about it, or if we need any additional
information from you.

Regards,

            Rosario


Followup 1

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Date: Fri, 11 Feb 2005 15:44:13 +0100
From: Juan Pradas <jpradas@astro.uni-bonn.de>
Subject: Re: bright CCDs and quota (PR#16999)
To: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
Estimada Rosario,

La "quota" que me habeis concedido es suficiente, muchas gracias. De 
hecho, ya me he bajado todos los datos que queria y no necesitare mas la 
quota aumentada. Con respecto a los problemas de calibracion, por el 
momento parece que estoy llegando a algunas conclusiones aunque  no son 
definitivas todavia. Quiza lo sean cuando haya analizado los datos 
nuevos... En cualquier caso, probablemente seria provechoso si pudiera 
intercambiar informacion al respecto con el calibration team. Seria esto 
posible?

 Un cordial saludo

   Juan

Rosario Gonzalez Riestra wrote:

>Dear Dr. Pradas,
>
>First of all, your XSA quota has been increased. Please let us know if this
is
>enough or if you need more space.
>
>As for the problem you report, it is already known by the calibration team
and
>it is under investigation.
>
>I'll let you know if there are some news about it, or if we need any
additional
>information from you.
>
>Regards,
>
>            Rosario
>
>
>
>  
>



Reply 3

Resend
From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: jpradas@astro.uni-bonn.de
Subject: Re: bright CCDs and quota (PR#16999)
Date: Fri Feb 11 14:52:35 2005

Hola Juan,

I am writing you in english because these messages might be read by some of my
colleagues here.

If you have any futher question or comment that you want to forward to the
Calibration  Team, please do it through the HelpDesk.

Good luck in your work !


Un saludo,

              Rosario

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