From: Vitaliy Fadeyev (VAFadeyev@lbl.gov)
Date: Mon Apr 05 2004 - 18:55:59 PDT
Rob,
according to Greg, it looks like the zeropoints in the Z-band news
are all constant, and defined to be around 32.32, with a note
that they are from the header.
For candidate 76 field, I get the zeropoint (translated from GOODs
AB zeropoint with -0.56 correction to the Vega, and relative aperture
photometry) of 32.39 +- 0.10.
vitaliy
"Robert A. Knop Jr." wrote:
> I've only tested one case, in Z-band, but what I found was that my
> aperture correction was ~0.6 magnitudes *too big*. This would tend to
> make our candidates 0.6 magnitudes *too bright*.
>
> As such, we can "fix" our Z-band magnitudes by *adding* 0.6mag to them.
> I think this brings us nicely in line with what Adam et al. have.
>
> (The reason we were closer last week was that I was using a bigger-- too
> big for efficiency purposes-- aperture, and with bigger apertures,
> errors in aperture corrections aren't as noticable.)
>
> I still haven't exactly tracked down this aperture correction error in
> the code, nor have I checked this in I-band, but this is what it looked
> like was happening.
>
> I apologize for the horrendous screw-up.
>
> -Rob
>
> --
> --Prof. Robert Knop
> Department of Physics & Astronomy, Vanderbilt University
> robert.a.knop@vanderbilt.edu
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