From: clidman (clidman@eso.org)
Date: Fri Apr 11 2003 - 10:18:41 PDT
Hi Greg,
This is usually quite difficult as the systemmatic error is usually quite high. This should
be tried with 2000fr (aka Beethoven) since the systemmatic errors in the spectrophotometry
for this SN are likely to be considerably smaller that the errors in other SN.
Cheers, Chris.
Greg Aldering wrote:
> Calling all SN spectroscopy experts!
>
> Can the restframe U-band spectra of the five z > 0.6 of the "HST 11"
> SNe be used to even partly discriminate between SNe Ia whose U-B colors
> are intrinsically different? We are using U-B to correct for
> extinction, and then also worrying that the intrinsic U-B color of the
> SN may be different. From the photometry we can't tell the difference,
> but maybe from the spectroscopy we can make a crude distinction using
> spectral features that are not degenerate with dust extinction. Perhaps
> the drop blueward of CaII, or some aspect of the Fe blends could be
> used?
>
> For Peter in particular, can the spectra rule-out (or rule-in) SNe with
> intrinsic U-B that deviates from the Jha U-B vs. stretch relation?
>
> Finally, this would be valuable for the Malmquist bias calculation - are
> we in fact picking up any unusually blue SNe at high redshift?
>
> - Greg
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