On Fri, 16 Apr 2004, Peter W. Draper wrote:
> On Thu, 15 Apr 2004, Tim Jenness wrote:
>
> > > > - Integrate under a spectral line, rather than only being able to
> > > > integrate under a fit.
> > >
> > > That's what the equivalent width is, I take it you want the result in
> > > simple data units.
> > >
> >
Well, for the only equivalent width we can find it's not clear to us
whether it is calculating it from the fit or from the data? Does "quick"
mean the data rather than fit?
The actual integrated intensity is what we want (not the equivalent width)
since that is directly proportional to the amount of "stuff" in the line
of sight for optically thin lines. It's a fundamental measurement used by
submm astronomers all the time. (in real units ie "K km/s" if we are using
a velocity scale).
--
Tim Jenness
JAC software
http://www.jach.hawaii.edu/~timj
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