From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Sat Jul 12 2003 - 09:38:02 PDT
Hi Saul,
I've looked at the plots you have so far. I like the Hubble diagram with
points within 0.01 in z averaged (page 6), the standard deviation plot
(page 8), and then am torn between whether to show the residuals wrt to
our best-fit (page 7) or wrt an open universe (page 9). The former is more
natural/traditional, but the open universe residuals is what Riess likes
to show (and it seems to have caught on). IMHO the latter plot happens to
look more convincing just because of how our residuals fall. For instance,
on page 7 is looks like the residuals follow a broad dip running from 0.45
< z < 0.85. (In fact, I bet the chi^2 improves by about 1-sigma if such an
ad-hoc curve (even with its 3 parameters) were put into the model!)
Anyway, I think these 3 types of plots (full linear Hubble diagram,
residual plot, standard deviation plot) could be put together just as in
P99, and that it would make a stronger positive impression than what's in
the paper now.
I would also add that the colored points really help the eye pull out the
central values better from the (necessary) clutter of error bars and
comparison models.
- Greg
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