From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Wed May 07 2003 - 18:24:17 PDT
HERE IS THE REVISED VERSION:
Hi Rob,
I started to investigate "what'sup" with SN1995bd and SN1996bo and
found that your B-band magnitudes differ, sometimes by a lot, from the
published Bmax tables from Table 3 of Riess 1999 (the 22 SNe paper).
Further investigation showed generally poor agreement. Can you
comment?
no extinction cor
Bmax mB mBcor Bmx-mB
R99 SCP03 SCP03
---------------------------------------------------------------------------
SN1995bd 17.27 15.32 17.39 HUGE! (weird that mB_cor is much better)
SN1996bo 16.15 15.85 15.92 +0.30
also, here are the other Riess 1999 SNe for comparison
SN1994M 16.35 16.25 16.13 +0.10
SN1994S 14.79 14.78 14.93 +0.01
SN1995ac 17.19 17.05 17.37 +0.14
SN1996bl 17.08 16.67 17.14 +0.41 way off!
These seem like large differences (some extremely large) given the
small uncertainty you quote from fitting the same data (few tenths of a
magnitude). Some of this is probably due to the crudeness of the
delta-m15 fits quoted in Riess 1999. I seem to recall that in P99 we
may have had a similar issue with the H96 data, but I haven't checked
that yet.
These offsets aren't enough to explain the anomalous extinction for
95bd and 96bo, unless the extinction estimate is off. So, I looked at
your E(B-V) values and compared them to the value in Phillips 1999
your ph99 tail ph99 peak
E(B-V) E(B-V) E(B-V)
------------------------------------------------------
SN1995bd 0.339 0.242 NOT GIVEN - dm15 < 0.9
SN1996bo 0.390 0.358 0.385
So here, the agreement for E(B-V) at max for 96bo is good. 95bd may be
another question, but it isn't as big an outlier as 96bo in the
extinction-corrected fits.
On to more data sifting.
- Greg
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