From: clidman@eso.org
Date: Tue, 27 Nov 2001 21:40:48 -0300
To: Serena Nobili <serena@ices02.physto.se>
CC: "Robert A. Knop Jr." <robert.a.knop@vanderbilt.edu>, DAHowell@lbl.gov
Subject: Re: definitive source for redshifts?

Hi Serena,
    This is too pessimistic. I think an error of 0.001 in the redshift is 
reasonable.

The z=0.546 estimate comes from the Keck spectrum whereas the z=0.543 
estimate comes from the VLT spectrum. I would imagine that the redshift from 
the VLT spectrum is more accurate as the OII line is at the edge of the 
wavelength range in the Keck spectrum.

  Andy, could you update the web page which Rob refers to. My apologies for 
not noting this error earlier.

Cheers, Chris.


Serena Nobili wrote:

> Using the OII and OIII emission lines on the host galaxy, one obtains
> z=0.543+/- 0.001. This is considering an uncertainty of less than 1AA
> in our spectrum(?!). One should also consider systematics in the
> wavelengths calibration, so pessimistically I would say that the redshift
> for Beethoven is 0.54 +/- 0.01 to be on the safe side.
>
> Cheers
>
> - Serena
>
> On Mon, 26 Nov 2001, Robert A. Knop Jr. wrote:
>
> > What is considered the definitive reference for redshifts of our
> > supernovae?  I've been assuming
> > http://www.supernova.lbl.gov/collab/data/spec, but Chris tells me that
> > Beethoven's redshift is different from the one listed there (by 0.003).
> >
> > -Rob
> >