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From: kargaltsev@gwu.edu
Subject: avoiding very bright source by turning off MOS?
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Private message: yes  no

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Date: Mon, 1 Oct 2018 18:17:48 GMT
From: kargaltsev@gwu.edu
To: xmmhelp@sciops.esa.int
CC: kargaltsev@gwu.edu
Subject: avoiding very bright source by turning off MOS?
Full_Name: Oleg Kargaltsev
Submission from: (NULL) (193.147.152.102)


Hello,

I would like to observe a relatively faint source which is about 13.8' away from
a very bright source. The latter source is so bright that it causes telemetry
problems. I was thinking of using EPIC-pn in SW mode (this will leave the very
bright source outside the pn field-of-view) but such approach would not work
with MOS. Can MOS be switched off completely to avoid the very bright source? Is
there any other option to avoid the very bright source?

Thanks, 

Oleg


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From: Jacobo Ebrero <xmmhelp@sciops.esa.int>
To: kargaltsev@gwu.edu
Subject: Re: avoiding very bright source by turning off MOS? (PR#84047)
Date: Tue Oct  2 09:25:49 2018
Dear Oleg,

Yes, in principle MOS cameras can be switched off if there are telemetry issues.
Are you sure you cannot follow the same strategy as in pn, putting your dim
source in the central chip in SW mode and leave the bright source outside?

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


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Subject: Re: avoiding very bright source by turning off MOS? (PR#84047)
To: Jacobo Ebrero <xmmhelp@sciops.esa.int>
From: Oleg Kargaltsev <kargaltsev@email.gwu.edu>
Date: Tue, 2 Oct 2018 09:55:23 -0400
Hi Jacobo,

On 10/2/18 5:25 AM, Jacobo Ebrero wrote:
> Dear Oleg,
>
> Yes, in principle MOS cameras can be switched off if there are telemetry
issues.
Ok, thanks.
> Are you sure you cannot follow the same strategy as in pn, putting your dim
> source in the central chip in SW mode
This can be done
>   and leave the bright source outside?
but then the very bright source will land on one of the outer MOS chips 
and it is so bright that there will be issues with telemetry.

Thanks,

Oleg
>
> Regards,
> Jacobo
> ----------------------
> Dr. Jacobo Ebrero
> XMM-Newton SOC
> User Support Group
>
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-- 
  
======================================================
Oleg Kargaltsev                   Associate  Professor
The George Washington University  Department of Physics
725 21st Street NW                tel:  (814) 404-6378
Washington, DC                    fax:  (202) 994-3001
20052   USA                       kargaltsev@gwu.edu

http://home.gwu.edu/~kargaltsev/


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