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

From: Vitaliy Fadeyev (VAFadeyev@lbl.gov)
Date: Mon Jul 12 2004 - 13:08:05 PDT

  • Next message: Rachel A. Gibbons: "Re: Planning how many orbits in which filters on which days..."

    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

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