Re: Planning how many orbits in which filters on which days...

From: Rachel A. Gibbons (ragibbons@lbl.gov)
Date: Mon Jul 12 2004 - 13:25:48 PDT

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        OK. Given this, we'd be getting a second lightcurve point and a
    spectrum of it at > +25 days.

        Doesn't sound too useful to me.

    On Mon, 12 Jul 2004, Vitaliy Fadeyev wrote:

    >
    > I did a quick-and-dirty lookup for acs04b-011 (aka Nessi).
    >
    > In May, it had Zmag = 23.83, I-Z = 0.70.
    > Now it has Zmag = 25.05, I-Z = 2.2 +- 0.4.
    > (The I-band signal is very faint now.)
    >
    > From Ariel's plots, this is consistent with redshift 0.9 Ia,
    > which was discovered at -5 restframes days and reobserved
    > at 22 days past maximum.
    > (The plot indicated about 50 observer days between these
    > two epochs, the actual time is 51. For comparison, redshift
    > 1.0 Ia would take 41 observer days to fade from one
    > magnitude to the next.)
    >
    > The original photo-z indication was z = 0.87 (95% conf. level
    > span of 0.62-1.48). The color evolution seems a bit fast to me,
    > but maybe this is just a faint signal fluctuation.
    >
    > vitaliy
    >
    >
    >
    > 

    -- 
------------------------------
Dr. R. A. Gibbons
Lawrence Berkeley National Lab
1 Cyclotron Rd MS 50R5032
Berkeley, CA 94720-8160
USA
Tel 510.486.7416
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