It is not possible to give a general answer to this question. Look in the
literature to see what has been used before, consider the physical processes
that you expect in the source, and use your imagination. Note that if you
are working with ACIS data any model you fit many not be a unique solution.
To give a trivial example : any spectrum that can be fit by a power-law
can also be fit by a sufficiently hot thermal bremsstrahlung. So, be sceptical.
Keith Arnaud
PS To CXC folks - it would be a good idea to use a variety of models in the
threads.
> I was wondering what models people were using to fit different spectrums.
> The threads seem to use POW and XSWABS which seem to work well for
> quasars, but for clusters of stars these don't work well. Can anyone
> suggest which model to use in a particular situation (ie for quasars, use
> POW and XSWABS, for X use Y and Z, ...)?
>
> Thanks,
> Ryan Foley
>
>
> ------------------------------------------------------------------------
> 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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