From: Robert A. Knop Jr. (robert.a.knop@vanderbilt.edu)
Date: Tue May 20 2003 - 05:26:05 PDT
On Tue, May 20, 2003 at 02:18:15PM +0200, Ariel Goobar wrote:
> So, then you probably can tell me what the significance of
> E(B_V)>0.1 is in terms of intrinsic spread. I, at least, have not seen
> any evidence that this would correspond to more than 2 sigma.
Well, if sigma[E(B-V)] is 0.05, then E(B-V)>0.1 is a 2sigma cut.
I know that Serena's paper has an 0.07 or 0.08 intrinsic spread in B-V,
but since that went out I realized that Greg is right-- it simply can't
be that high. Otherwise, Phillips would have seen an intrinsic
dispersion in extinction-corrected supernova magnitudes of something
like 0.28 rather than the 0.11 he sees. In fact, the real intrinsic
dispersion on B-V probably can't be more than 0.03 (given RB=4.1) or
0.05 (if you allow for a radically lower RB close to the one I'd like to
use if it weren't so radical to use a radically lower RB).
-Rob
-- --Prof. Robert Knop Department of Physics & Astronomy, Vanderbilt University robert.a.knop@vanderbilt.edu
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