Re: K-corrections

From: LWang@lbl.gov
Date: Tue Mar 09 2004 - 11:53:03 PST

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    Dear Serena,

         Thanks for the k-corrections. I have run a
    quick comparison and our k-corrections are indeed
    very different. I do not have time to resolve the
    reasons - this means mine could be wrong. The size
    of my k-corrections up to redshift z = 0.09 are all
    quite small, typically below 0.1 mag. I will have to
    do the calculations using your spectra to see what
    is going on. I will put that on the first thing to
    do when I get back next week from a meeting.

         Cheers,

    Lifan

    ----- Original Message -----
    From: Serena Nobili <serena@physto.se>
    Date: Tuesday, March 9, 2004 4:06 am
    Subject: K-corrections

    >
    > Dear Lifan,
    >
    > given the disagreement you pointed out between
    your and my K-
    > correctionsit would be nice to try to find out
    what is going on.
    > As I recall it, you
    > said the differences were only above redshift
    0.07, is this
    > correct? I
    > send you as attachment K-corrections I computed
    using my spectral
    > templates (which you find in the Stockholm web page:
    >
    http://www.physto.se/~snova/private/templates/snflux_1a_serena.dat.gz
    ) as
    > a function of time for some relevant redshift
    (z=0.01,0.05,0.08).
    > Also, it
    > would be nice to understand what spectra you are
    using for
    > computing the
    > K-corrections (perhaps we could start with a list
    of them).
    >
    > Meanwhile, can you provide me with a list of SNe
    that you have in the
    > Hubble diagram and their fitted Imax? This way I
    can check why I
    > seem to
    > get a larger dispersion than you.
    > Thank you for your help.
    > Cheers
    >
    > Serena
    >
    >
    > On Tue, 24 Feb 2004, Serena Nobili wrote:
    >
    > >
    > >2) Lifan computes different K-corrections than I.
    We should try to
    > > compare them and figure out why there are
    differences. Serena uses
    > > the spectral templates published in Nobili et
    al 2003. Lifan
    > uses a
    > > sample of nearby spectral templates for which
    he computes the
    > > K-corrs and average them out. Lifan will try
    to compare them.
    > > As Ariel pointed out, we would like to use
    templates for
    > computing
    > > K-corrections, as this is used for the high-z
    SNe, in order not to
    > > treat them differently.
    > >
    >
    >
    >
    >
    >
    >
    --------------------------------------------------------------------
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    >
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