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From: kluli@stanford.edu
Subject: creating surface brightness profile + spatial temperature profile
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To: xmmhelp@xmm.vilspa.esa.es
Subject: creating surface brightness profile + spatial temperature profile
Date: Thu, 07 Aug 2003 02:14:00 -0700
From: kluli@stanford.edu
Dear Sir or Madam, I'm trying to create a surface brightness profile 
and a spatial temperature profile. I browsed through the SAS manual but 
I couldn't find any relevant information. Would you please give me a 
brief guide as to how to construct those profiles or direct me to some 
easy-to-follow references? Thank you for your consideration.

Best,

Garving K. Luli


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From: Matteo Guainazzi <xmmhelp@xmm.vilspa.esa.es>
To: kluli@stanford.edu
Subject: Re: creating surface brightness profile + spatial temperature profile (PR#8904)
Date: Fri Aug  8 07:05:51 2003
Dear Dr. Luli,

1. unfortunately, there is no SAS task that allows a user to automatically
create a brightness profile. One has to create a small piece of code or script,
which, e.g., extracts event lists in annuli of increasing radii (via, e.g.,
"evselct"), calculates the number of counts in each annulus (via, e.g., the
FTOOLS "fstatistics"), correct for the wignetting, and normalize the counts for
the extragion region area and, if needed, for the peak brightness. If you need
more details on how to accomplish each of the steps above, please do not
hesitate to contact us

2. determining a temperature profile is a rather complex data analysis task,
which implies spectral fitting of spatially resolved spectra, taking into
account (in the generation of the instrument response function) several subtle
calibration effects. I can indicate you a couple of references, which discuss
this issue:

- Arnaud M., et al., 2001A&A...365L..80A
- Majerowicz S., et al., 2002A&A...394...77M 
- Molendi S., 2002ApJ...580..815M
- Pizzolato S., et al., Astrophys.J. 592 (2003) 62-78

 I hope this may help.

 Regards,

 Matteo Guainazzi
 XMM-Newton Science Operation Center
 User Support Group


 

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