Re: SN 1999Q

From: Chris Lidman (clidman@eso.org)
Date: Mon Nov 01 2004 - 18:12:40 PST

  • Next message: Chris Lidman: "SN 1999Q"

    Hi Rahman, Serena,
      I've now cross checked the photometry with the 2MASS catalogue. The
    magnitudes agree within 0.05 magnitudes (the 2MASS magnitudes are
    brighter), which is not great but satisfactory. Hence, we do not
    agree with the photometry of Riess et al., unless we have
    selected the wrong object.

      If we tie the SOFI image to the 2MASS system, we get J=22.57. The
    colours suggest that this 99Q is quite either intrinsically red or
    reddened.

    Cheers, Chris.

    On Mon, 2004-11-01 at 08:54, Chris Lidman wrote:
    > Dear Rahman and Vallery,
    > Many thanks for doing this. You have done exactly what I have asked
    > you to do.
    >
    > Both our estimates agree. I only need to verify the zero point
    > (I'll use the 2MASS catalogue for this) and we can be confident that
    > Reiss et al. have made an error (again!).
    >
    > Regards,
    >
    > Chris.
    >
    > On Mon, 2004-11-01 at 07:19, Rahman Amanullah wrote:
    > > On Thu, 21 Oct 2004, Chris Lidman wrote:
    > >
    > > > I have a request for you. I have reduced the SOFI IR data on SN 1999Q,
    > > > an unusual SN from the Reiss et al. 2000 paper. I'm finding that this SN
    > > > is much brighter than that published by Reiss et al. Can I ask you to do
    > > > an independent measurement of the magnitude.
    > >
    > > Hello Chris, I am not quite sure how you wanted us to check this, but we
    > > have done a PSF fit to the image that you provided, and we measure the
    > > magnitude to be about J = 22.62 +/- 0.13. This, assuming that exposure
    > > time and everything else is included in the zero point that you gave us.
    > > Subtracting the fitted PSF gives a very clean subtraction.
    > >
    > > Cheers,
    > >
    > > Rahman & Vallery
    > >
    > > __________________________________________________________
    > > Rahman Amanullah, +46 8 553 786 61
    > > Stockholm University ICQ: 62860758
    > > Stockholm Centre for Physics, 17d 50m E
    > > Astronomy & Biotechnology 59d 26m N
    > >
    > > http://www.physto.se/~rahman/rahman-public.gpg
    > >
    >
    >

    This archive was generated by hypermail 2.1.4 : Tue Nov 02 2004 - 00:52:49 PST