This bounced so I am sending it on....
Belinda
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Date: Tue, 17 Sep 2002 15:06:15 -0400 (EDT)
From: Tahir Yaqoob <yaqoob@skysrv.pha.jhu.edu>
To: <chandra-users@head-cfa.harvard.edu>
Subject: Re: CTI Corrected Response
In-Reply-To: <Pine.LNX.4.44.0209171413400.10031-100000@krupa.jca.umbc.edu>
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Examining a dozen or so grating spectra of AGN,
it seems the 10-30% residuals in the 2-2.3 keV
band are ubiquitous -my understanding is that
the mirror edge region there is a very difficult part
of the response to model.
Tahir
On Tue, 17 Sep 2002, Danny Hudson wrote:
> Hi all,
>
> I am trying to fit CTI corrected data to a large region (spanning the four
> I chips) and am running into problems around 2 keV. I am using an rmf
> file which is computed from a count weighted average of the rmfs provided by
> the PSU team. The mirror edge (slightly above 2 keV) seems to be
> exaggerated when the model is folded through the response, making it
> impossible for the model to fit the data. There also seems to be a
> systematic model excess slightly below 2 keV. Has anyone else noticed
> this effect? It seems to be less noticeable in small regions where the
> uncertainty in counts are high.
>
> Danny
>
>
------------------------------------------------------------------------
Dr. Belinda Wilkes Tel : (617) - 495 - 7268
Harvard/Smithsonian email: belinda@cfa.harvard.edu
Center for Astrophysics fax : (617) - 495 - 7356
60 Garden Street Assistant Director
Cambridge MA 02138 Chandra X-ray Center (CXC)
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