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From: Ed Lloyd-Davies <ejdavies@umich.edu>
Subject: RGS low energy QE
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Date: Mon, 17 Jan 2005 16:02:45 -0500
From: Ed Lloyd-Davies <ejdavies@umich.edu>
Subject: RGS low energy QE
To: xmmhelp@xmm.vilspa.esa.es
I am seeing systematic increases in the fitted hydrogen column with
observation date for both RGS instruments. The increases appear
additive, both low and and high column sources increase by roughly
the same amount ~2x10^20 with about half this column added between 
mid 2000 and mid 2001 and rest added over the following years to
date. I have verified this trend for MKN 421, 3C 273, PKS 2155-304
and MCG-6-30-15, which are all bright AGN with multiply observations
spread over a considerable time period. Is it possible that there is 
build up of hydrocarbon ices in the optical path of the RGS similar 
to the problems expirienced by the Chandra ACIS instrument? Do you 
know of any other issues that could by cause this effect? I am in 
the process off testing whether there is any similar trend in the 
EPIC instruments although one who have thought that it would have
been noticed already if that was the case. Thank you for your 
attention.

Regards,

Ed

+----------------------------------------+---------------------------+
|  Ed Lloyd-Davies,                      | Email: ejdavies@umich.edu | 
|  Postdoctoral Fellow,                  |                           |
|  Department of Astronomy,              |                           |
|  University of Michigan,               |                           |
|  830 David M. Dennison Building,       |     Tel : +1 734 615 1585 | 
|  Ann Arbor, Michigan 48109-1090        |     Fax : +1 734 763 6317 | 
+----------------------------------------+---------------------------+
|  Do or do not; there is no try. - Yoda                             |
+--------------------------------------------------------------------+


Reply 1

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From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: ejdavies@umich.edu
Subject: Re: RGS low energy QE (PR#16935)
Date: Tue Jan 18 15:47:54 2005
Dear Dr. Lloyd-Davies,

I have forwarded your question to the RGS Calibration Scientist. I'll let you
know as soon as I get his answer.

Regards,

               Rosario Gonzalez-Riestra
               XMM-SOC User Support Group 

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