From: Rachel A. Gibbons (ragibbons@lbl.gov)
Date: Sat May 22 2004 - 17:21:34 PDT
Vitaliy,
OK. So this answers my previous e-mail. We'll look into this and all
the candidates after we're back to the office late tonight. I suggest
moving on.
Rachel
On Sat, 22 May 2004, Vitaliy Fadeyev wrote:
>
> I meant the real objects -- galaxies and such. They subtract nicely on
> other tiles,
> but not on acs04maysub-i/norm01i.
>
> vitaliy
>
>
> Robert A. Knop Jr. wrote:
>
> >Bear in mind that there are an infinite number of cosmic rays in the
> >I-band images. The references, however, being a sum of many images,
> >don't have cosmic rays.
> >
> >As such, yes, the sub and new images are going to look very similar,
> >since all those CRs will still be there.
> >
> >The trick is to find some *real* objects and see if those subtract. If
> >they don't, then maybe there's a ratio problem.
> >
> >-Rob
> >
> >On Sat, May 22, 2004 at 05:04:52PM -0700, Vitaliy Fadeyev wrote:
> >
> >
> >>Robert A. Knop Jr. wrote:
> >>
> >>
> >>
> >>>The main thing people should do now is go through the saved
> >>>candidates, get I-band magnitudes if possible, and check to see if
> >>>they are on the April subtractions.
> >>>
> >>>
> >>>
> >>I looked up the I-band information. Most candidates fall into one of the
> >>3 cathegories:
> >>a) clear signal, b) no signal or fluctuation, c) there is a CR in that
> >>place. Could not really
> >>conclude anything about candidates # 0 and 1. They are on subtractions
> >>|acs04maysub-i/norm01i,
> >>|for which the "new" images looks exactly the same as the subtraction in
> >>the tiles.
> >>The "global" images for the new and the subtraction are very similar as
> >>well, with
> >>the subtraction showing slightly less flux than the new. It seems that
> >>the reference
> >>image calibration is off (scaled down). Therefore I cannot trust the
> >>information for
> >>these candidate.
> >>
> >>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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