From: Greg Aldering (aldering@panisse.lbl.gov)
Date: Sat Jan 24 2004 - 10:09:13 PST
Hi Serena,
I will be Hawaii this next week and will see what more John Tonry is
willing to tell me privately concerning 99Q. I am hoping he will be
willing to show me a lightcurve and tell me the date of maximum that they
found. That way I will know whether they have many more lightcurve points
than we have now collected, and whether their date of maximum should be
trusted or not. What other information (short of their data points, which
John is unlikely to provide - although I'll ask if he seems open to that)
should I try to find out?
Cheers,
Greg
P.S. Vitaliy and I wondered whether by shifting the date of max for 99Q
would it then become brighter and thus less of an outlier on the
I-band Hubble diagram?
On Sat, 24 Jan 2004, Serena Nobili wrote:
>
> Dear Vitaliy,
>
> These results (all of them) are very interesting and might be the reason
> why 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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