Re: clarification on my comments about intrinsic color dispersion

From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Wed Feb 26 2003 - 22:08:42 PST

  • Next message: DAHowell@lbl.gov: "Re: clarification on my comments about intrinsic color dispersion"

    Hi Andy,

    I agree that there could be lots of reasons why SNe are blue in U-B; my
    point was simply that SNe which are blue for any reason will be more common
    in our highest redshift sample. Whether this is a dangerous argument - well
    given that our NIR data should be able to check this in the near future I'm
    am not all that worried - people will have to discuss whether an analysis
    with this approach is included in the paper.

    > I don't see this. Our U-affected SNe in this paper are:
    >
    > name z stretch
    > 97201 0.863 1.05 +/- 0.01
    > 97226 0.778 1.06 +/- 0.04
    > 9878 0.644 0.76 +/- 0.03
    > 98104 0.638 1.05 +/- 0.05
    >
    > This spans the range in Jha's plot from the lowest U-B=-0.85 at s=1.04
    > to the highest U-B= -0.1 at s=0.82.

    By the way, I used the SN with largest sigma E(B-V) in table 3. These
    are:

       name z s
     -------------------
     sn97201 0.863 1.05
     sn97226 0.778 1.06
     sn98104 0.634 1.05
     sn98184 0.740 0.95

    Cheers,

    Greg

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