From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Sat May 17 2003 - 13:35:40 PDT
Hi Rob,
I believe that correct way to isolate the E(B-V) uncertainties is to
Monte Carlo only the E(B-V) errors and then look at the distribution of
best-fit values of Om in a flat universe. This would be very time
consuming if you let script M and alpha vary, since you have to
marginalize over their probabilities. A fast, but less accuract way
would be to let MINUIT or some other solver crank out the best-fit
values based on the equations for Om, script M, and alpha (with Ol =
1-Om).
The shifting technique you discuss might be an OK stop-gap. I guess
we can expect the Om shift to be about the size of the magnitude shift,
e.g., 0.08 or 0.06.
- Greg
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