From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Wed May 07 2003 - 18:14:36 PDT
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 mX Bmx-mB
R99 SCP03 SCP03
---------------------------------------------------------
SN1995bd 17.27 17.39 15.32 -0.12 Note that mX is WAY OFF
SN1996bo 16.15 15.92 15.85 +0.23
also, here are the other Riess 1999 SNe for comparison
SN1994M 16.35 16.13 16.25 +0.22
SN1994S 14.79 14.93 14.78 -0.14
SN1995ac 17.19 17.37 17.05 -0.18
SN1996bl 17.08 17.14 16.67 -0.06
These seem like large differences 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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