Re: acs04-076 host colors

From: Rachel Gibbons (rachel.a.gibbons@vanderbilt.edu)
Date: Fri Dec 03 2004 - 08:57:50 PST

  • Next message: Vallery Stanishev: "Re: acs04-076 host colors"

        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
    > >

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