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From: D.Galloway@physics.unimelb.edu.au
Subject: Simulations using fakeit with canned .rmfs - what to use for .arf?
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Date: Fri, 14 Oct 2005 07:18:54 GMT
From: D.Galloway@physics.unimelb.edu.au
To: xmmhelp@xmm.vilspa.esa.es
CC: D.Galloway@physics.unimelb.edu.au
Subject: Simulations using fakeit with canned .rmfs - what to use for .arf?
Full_Name: Duncan Galloway
Submission from: (NULL) (128.250.50.149)


Hi,
  I'm trying to do simulations in Xspec 11.3 using the fakeit command. I
downloaded the "canned" responses recommended for AO-5, which (as I understand
it) include the ancillary response file. However, fakeit prompts for two
separate files; if I just quote the rmf and leave the arf blank, it does not
appear to give sensible results (wildly different than PIMMS, for example). I
have tried giving the .rmf file when prompted for the arf, but this gives an
error. How do I get fakeit to read in the arf from the .rmf file? Alternatively,
are there also canned .arfs available somewhere? I've looked on the website but
can't find them. I recall they were available last round?
  I've also tried using SciSim, but my simulation gets to 6% each time and then
just hangs with the message "Initializing simulators". Not impressed.
Duncan.


Reply 1

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From: Pedro M. Rodriguez Pascual <xmmhelp@xmm.vilspa.esa.es>
To: D.Galloway@physics.unimelb.edu.au
Subject: Re: Simulations using fakeit with canned .rmfs - what to use for .arf? (PR#19949)
Date: Fri Oct 14 07:32:49 2005
Dear Duncan,

Canned response files only contain redistribution matrices, effective area (arf)
is not included. Unfortunately, canned arf's are no longer available. This
should be generated with SAS task arfgen, for which the redistribution (rmf) is
an input. 

Depending on the actual simulation (actually, on the number of photons/rays to
simulate) and on the computer performance, a SciSim realization may take a
really long time.

Sorry,

Pedro

> Full_Name: Duncan Galloway
> Submission from: (NULL) (128.250.50.149)
> 
> 
> Hi,
>   I'm trying to do simulations in Xspec 11.3 using the fakeit command. I
> downloaded the "canned" responses recommended for AO-5, which (as I
understand
> it) include the ancillary response file. However, fakeit prompts for two
> separate files; if I just quote the rmf and leave the arf blank, it does
not
> appear to give sensible results (wildly different than PIMMS, for example).
I
> have tried giving the .rmf file when prompted for the arf, but this gives
an
> error. How do I get fakeit to read in the arf from the .rmf file?
Alternatively,
> are there also canned .arfs available somewhere? I've looked on the website
but
> can't find them. I recall they were available last round?
>   I've also tried using SciSim, but my simulation gets to 6% each time and
then
> just hangs with the message "Initializing simulators". Not impressed.
> Duncan.
> 
> 

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