From: VAFadeyev@lbl.gov
Date: Sat Jan 24 2004 - 17:14:17 PST
Dear Serena,
here are the minuit fit plots you have asked about:
case 1:
http://www-physics.lbl.gov/~fadeyev/snminuit_sn1999q_HSTonly.ps
case 2:
http://www-physics.lbl.gov/~fadeyev/snminuit_sn1999q_HSTfixtmax.ps
case 3:
http://www-physics.lbl.gov/~fadeyev/snminuit_sn1999q_HSTdisc.ps
Cheers,
vitaliy
----- Original Message -----
From: Serena Nobili <serena@physto.se>
Date: Saturday, January 24, 2004 9:39 am
Subject: Re: SN 1999Q lightcurve
>
> Dear Vitaliy,
>
> These results (all of them) are very interesting and might be the
> reasonwhy they were not published yet!!! The only information
> missing for my
> analysis was indeed the stretch factor, but I am also using the
> time of B
> maximum given in the paper as input to some of the analyses. Given
> this, I
> need to think how to proceed.
>
> One possibility for the discrepancy, is in the K-corrections. We have
> already checked with the paper by Tonry et al.(2003) that K-
> corrections in
> the infrared were different, I would not be surprised to find that the
> same is true for the optical. It would be good if you could check the
> K-corrections given in Tonry for a SN at about the same redshift
> as 1999Q,
> for the same filters, and see if yours agree with theirs. I think
> it is
> important you do the checks, for consistency with the templates
> you are
> using to compute them.
>
> Another thing to try is to see whether we can reproduce the B-I
> given
> for 1999Q in Riess et al. I can have a look at this.
>
> Can you send me the plots you get for each of the cases? I would
> like to see how the lightcurve fit looks like for each of them.
>
> One thing is sure: the problems I have encountered since I started
> looking
> at the case of 1999Q are almost infinite. The mismatch between the
> table and the plot is only the top of the iceberg. I really want
> to see
> how much more we can discover on this.
> Thank you very much for your precious collaboration.
> Cheers
>
> Serena
>
>
> On Fri, 23 Jan 2004, Vitaliy Fadeyev wrote:
>
> >
> >
> >Hi Serena,
> >
> >these are the results of my fits to SN 1999Q lightcurves:
> >
> >case m_B dm_R m_B_corr dm_B_corr s ds chisq dof m_R
> kcorr_R kcorr_I tmax dtmax R-I d(R-I)
> >1 22.82 0.06 23.02 0.16 1.117 0.054 5.29 8 22.06 -0.764 -
> 0.310 2451186.54 1.444 -0.054 0.074
> >2 23.43 0.03 23.59 0.08 1.086 0.031 19.85 9 22.39 -1.042 -
> 0.531 2451197.52 0.000 -0.323 0.029
> >3 23.14 0.02 23.34 0.07 1.119 0.032 9.95 9 22.24 -0.902 -
> 0.419 2451191.83 0.853 -0.188 0.035
> >
> >The fit "cases" are as follows:
> >1) stand-alone HST data, no constraints. In this case, the day
> >of max is shifted to earlier time by 11 days compared to what
> >Riess has reported. The Chi^2 is good (too good).
> >2) the maximum is fixed to the Riess's value. The Chi^2 becomes
> >"bad".
> >3) Greg pointed out that IAU circular contains the I band discovery
> >magnitude. I assumed that that data value has error of 10%
> >and that it was measured with similar filter to F814W. Adding
> >this point resulted in third case. The day of max is about 6 days
> >earlier than reported value, Chi^2 is good.
> >
> >So, you can take this with appropriately sized grain of salt or
> >other substances. Feel free to critisize.
> >
> >If B band stretch value is all you care about, then it seems that
> >proper value would be about 1.1 . However, the time-of-max
> discrepancy>is worriesome.
> >
> >Cheers,
> >vitaliy
> >
> >
> >
> >
>
> --
>
> -------------------------------------------------------------------
> ---
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> Tel +46 8 55378661
>
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>
>
>
>
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