From: Robert A. Knop Jr. (robert.a.knop@vanderbilt.edu)
Date: Fri Mar 21 2003 - 15:30:43 PST
I'm done trying different ways of fitting the P99 data. You can see the
results at:
http://brahms.phy.vanderbilt.edu/~rknop/scp/hst/#whatchanged
The final fits which will be used in the HST paper are the ones that
went into the stroked contours of line A-5. If you want to pick and
question and wonder about the absolute best way to fit the lightcurves,
please leave me out of the discussion; I need to move forward with the
paper rather than keep rehashing this until the end of time.
It is clear to me that the right thing to do right now is to fit
everything as consistently as possible, and the HST lightcurves require
simultaneous fits with fixed zeros. So that's how it will be done
(except for P99 data without final refs) for everything. It's also
clear to me that the idea of trying to just use the P99 paper as a
result which we add only the new HST supernovae to is not the right or
consistent thing to do, given the new K-corrections and lightcurve
templates, and especially given our error in Galactic extinction.
Finally, it's clear to me that fairly small changes in the fit method
and templates *can* bias your results, and as such we need to include
that as about ~0.03 of systematic error, in addition to any systematic
error due to K-corrections. We can leave determining the One True
Method, the Fundamental Template, and the Absolute K-Correction all to
future papers... at least if we think we want to publish this one
sometime this year. (I intend to have an undergrad this summer work on
the effect of propogating uncertainties into K-correctinos.)
Next, I will redo all of the R99 and HST fits, regenerate all of the
cosmology fits that go into the paper plus *some* of the cross-checks
I'd done before, updated the draft and the text, and put out a new draft
early next week. If anybody wants to contribute the little bits they're
supposed to contribute, feel free to do so at any time.
-Rob
-- --Prof. Robert Knop Department of Physics & Astronomy, Vanderbilt University robert.a.knop@vanderbilt.edu
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