Re: acs04-076 host colors

From: Vallery Stanishev (vall@physto.se)
Date: Fri Dec 03 2004 - 10:31:31 PST

  • Next message: Robert A. Knop Jr.: "Re: acs04-076 host colors"

    Hi All,

    This is also consistent with the SN spectrum, which suggest z~1.72.
    Meanwhile, I have reduced the spectrum with the new version of aXe.
    However, it needs a it more work to get the final spectra of the SN and
    host. I will do that next week.

    Vallery

    On Fri, 3 Dec 2004, Rachel Gibbons wrote:

    > By the way, it'd also be nice to have the fits on the Wiki page.
    >
    > On Fri, Dec 03, 2004 at 10:51:12AM -0600, Rachel Gibbons wrote:
    > > Tomas and Ariel,
    > >
    > > z~1.8, wow!
    > >
    > > As I note on the page, I can quote statistical errors. In fact,
    > > I did make estimates of the NIC2 errors, which you can find further
    > > down the page, but I can easily transfer those numbers to the top
    > > table. The ACS errors I didn't bother calculating, but thought
    > > you might want to see them eventually.
    > >
    > > Rachel
    > >
    > > On Fri, Dec 03, 2004 at 05:44:52PM +0100, Ariel Goobar wrote:
    > > > Hi All,
    > > >
    > > > Tomas had a look at the host colors that Rachel posted. We couldn't
    > > > find error bars on all those colors so he experimented a bit with
    > > > errors in the fluxes ranging from 0.02 to 0.1 mag. He did this for both
    > > > apertures quoted and the two knots. So, both knots seem
    > > > definitely to have the same redshift. Depending on
    > > > what the errors actually are, the best fit photo-z's
    > > > come out between 1.69 and 1.86. For all choices, the
    > > > actual distributions around the best fit values are
    > > > nicely gaussian and have a sigma consitent with the range
    > > > above. So, I think the final number will be something
    > > > around z~1.8 +- 0.1. What remains is work out what the
    > > > error on the measured colors are, but looking at Tomas'
    > > > plots, I don't think his analysis would yield a
    > > > different answer for any reasonable values of the errors.
    > > >
    > > > Cheers,
    > > > Ariel
    > > >
    > > > On Thu, 2 Dec 2004, Rachel Gibbons wrote:
    > > >
    > > > > Ariel,
    > > > >
    > > > > If you go to the candidate page and click on "MingusHost"
    > > > > you'll find magnitudes in the first table you see.
    > > > >
    > > > > Ciao,
    > > > >
    > > > > Rachel
    > > > >
    > > > >
    > > >
    > > > --
    > > > ___________________________________________________________________
    > > > Ariel Goobar (www.physto.se/~ariel)
    > > > Department of Physics, Stockholm University
    > > > AlbaNova University Center, SE-106 91 Stockholm, SWEDEN
    > > > tel: +46 8 55378659 fax: +46 8 55378601
    > > >
    >
    >

    -- 
    ********************************************************
    Dr. Vallery Stanishev
    Stockholm University
    AlbaNova University Center
    FYSIKUM
    106 91 Stockholm
    SWEDEN
    

    tel: +46 8 55378731 fax: +46 8 55378601 vall@physto.se vall_1@yahoo.com ********************************************************



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