Re: SCanning and such update

From: Vitaliy Fadeyev (VAFadeyev@lbl.gov)
Date: Sat May 22 2004 - 17:12:22 PDT

  • Next message: Marek Kowalski: "coordinates"

    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
    >>
    >>
    >>
    >>
    >>
    >
    >
    >

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