Re: multiplicative user-defined models

I have written the Pei (1992) extinction curves for MW, LMC and SMC into 
S-Lang format to use with ISIS. If you want them I am willing to make them 
available.
Cheers,
Rhaana 

Rhaana Starling
Swift Scientist/Research Associate
University of Leicester


On Mon, 6 Nov 2006, rgibson_at_email.domain.hidden
> Let's say I'm defining my own reddening fit model, similar to redden().  I use
> add_slang_function() to register it with ISIS.  Call it myRedden().
> 
> Should myRedden return bin-integrated values (integrated over \Delta\lambda, the
> bin width in Angstroms)?
> 
> If I use a fit_fun("myRedden(1) * powerlaw(1)"), powerlaw(1) is already
> bin-integrated, so integrating myRedden would mistakenly throw in a factor of
> bin-width, and it appears that ISIS does not account for that.  I.e., ISIS
> assumes that only one component of a multiplicative model (term) is
> bin-integrated.
> 
> Also, comparison with the get_model_counts() values returned by redden()
> indicates that bin-integration would be wrong.
> 
> Do I understand this correctly?  If so, there is obviously potential for
> confusion, especially if I use non-physical models like "poly(1) *
> powerlaw(1)".  Just educating myself.
> 
> Thanks,
> Rob
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