Re: K-Correction histogram for B and V

From: Lifan Wang (lifan@panisse.lbl.gov)
Date: Thu Apr 01 2004 - 16:45:36 PST

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    Hi, All,

            Here is the histogram for B and V. As you can see this time, they
    agree perfectly. These are for SNe at day 0 as with the colors given by
    Serena's template.

            Cheers,

    Lifan

    On Thu, 1 Apr 2004, Lifan Wang wrote:

    > Chris,
    >
    > There are four figures in the plot. They are K-R and K-I at z =
    > 0.05 and 0.08, respectively.
    >
    > Cheers,
    >
    > Lifan
    >
    > On 1 Apr 2004, Chris Lidman wrote:
    >
    > > Hi Lifan,
    > > From the label on the x-ordinate, it would appear that this is for the
    > > R filter. Can you do the same for I? Also, is this plot applicable to a
    > > single redshift?
    > >
    > > Cheers, Chris.
    > >
    > > On Thu, 2004-04-01 at 19:29, Lifan Wang wrote:
    > > > Hi,
    > > >
    > > >
    > > > Here is the histogram of K-corrections for all of the spectra that I
    > > > have. The template spectrum Serena sent to me is marked by the red "temp".
    > > >
    > > > I might have found the reason for the difference between my K-corr and
    > > > the Serena's. In my fit, I only normalize the spectra to the observed
    > > > magnitudes close to the region of interest, and use a smooth function for
    > > > the normalization. When I try to include all the colors, I do end up
    > > > something closer to what I can get from Serena's template, but I think
    > > > this is unphysical.
    > > >
    > > > In the attached figure, the spectrum from Serena's template is treated
    > > > just as the observed spectra. They are normalized to to VRI magnitudes,
    > > > normalizing only to RI magnitudes makes no difference in my results.
    > > >
    > > > Note that contrary to what's in Rob's email, that in my approach, I did
    > > > not "applying the function that pushes it a little up here, a little down
    > > > there, in comparison to what Serena did".
    > > >
    > > > The normalization function I use has NO wiggles, and as it seems, we all
    > > > agree that this is important.
    > > >
    > > > Because my normalization applies only for VRI, the spectra in U and B
    > > > are arbitrary. I hope this also addresses Rob's previous email requesting
    > > > my spectra at 3000A.
    > > >
    > > > Cheers,
    > > >
    > > > Lifan
    > > >
    > >
    >
    > 

    -- 
Lifan Wang           (510) 495 2733 (o)   (510) 704 0119 (h)

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