Re: Vallery's analysis of grism spectra

From: Rachel G. (gibbo@panisse.lbl.gov)
Date: Mon Dec 08 2003 - 20:04:07 PST

  • Next message: Andrew Fruchter: "Re: Vallery's analysis of grism spectra"

            Looking more closely at your write-up, there are
    many details missing, so it's not clear how useful my
    comment #2 is, if at all.

    > regarding Riess' data:
    >
    > 1. We should be able to handle sub-pixel dithered data. It
    > isn't an easy problem, but there is existing software that
    > can properly handle such data. I can look into this.
    >
    > 2. The background subtraction is an important step.
    > Remember flat-fielding is wavelength dependent, so the
    > background you subtract has to be flattened properly as
    > well. This could very well be the source of some of the
    > differences with Riess' reduction (along with #1).

    This archive was generated by hypermail 2.1.4 : Mon Dec 08 2003 - 20:04:23 PST