From: Kyle S Dawson (KDawson@lbl.gov)
Date: Thu Jan 18 2007 - 08:12:33 PST
Hi Marc et al,
Gerson put that Hubble Diagram together using all, or almost all of the SNe discovered in the program. Many of these,
including the 5 below, were not spectroscopically confirmed Ia's. In publishing a cosmology result, we will only be using
those SNe which are either spectroscopically confirmed or hosted by an E type galaxy. This will probably total 12 or so
SNe. Gerson's diagram should be interpreted as an indicator of the SN rates in the program, and provides a
representation of the depth and coverage of the lightcurves.
We do try to spectroscopically confirm all active SNe, but often the telescope time does not coincide with the SN
discovery, and in times when it does, we still run the risk of weather or significant host galaxy contamination preventing a
valid typing of the SN.
-Kyle
----- Original Message -----
From: Marc Postman <postman@stsci.edu>
Date: Thursday, January 18, 2007 6:49 am
Subject: Re: hubble plot for cluster SNe PRELIMINARY
To: Gerson Goldhaber <G_Goldhaber@lbl.gov>
Cc: hstclustersn@lbl.gov
> One would hope this assertion is true but do we have any other
> supporting data to corroborate their non-Ia status? Otherwise we
> risk
> being accused of throwing out data simply because it doesn't fit.
>
> On Jan 17, 2007, at 6:45 PM, Gerson Goldhaber wrote:
>
> > This is to be compared with David Rubin's fits using Salt.
> > What is obvious is that there are 5 clear outliers - presumably
> not
> > type Ia SNe viz B4-Michaela, G3-Brian, F8-Ayako, B3-Isabella, and
>
> > H3-Elizabeth.
>
> -----------------------------------------------------------------
> Marc Postman Email: postman@stsci.edu
> STScI - CMO Phone: +1-410-338-4340
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>
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