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- W1657001710 abstract "A brief introduction to fringing in CCD chips is presented leading to a qualitative and quantitative discussion of the effect of fringes on STIS G750L and G750M spectra. G750L and G750M spectra of Jupiter’s moon Io have been analyzed to study the efficacy of flat fielding of extended objects with tungsten flat field exposures taken together with the science data (i.e., contemporaneous flat). Spectra of Io taken at different positions along the slit and reduced with pre-flight pipeline flats and contemporaneous flats were compared assuming that only the flat field, and not the spectrum of Io, changed as the target was centered at different positions along the slit. For G750L, contemporaneous flat fields are essential if a signal-to-noise above 10 is required in the region of strong fringing—7000 to 10000A. The residuals of the G750L fringes can be reduced below the 1% level by division by a well-exposed contemporaneous tungsten flat field. For G750M some advantage is displayed in the use of contemporaneous over pre-flight flats; however, the results are not conclusive since Io was drifting out of the slit during the course of the observations and the signal-to-noise on the spectra is less than 100. Further observations will be needed to better determine the signal-to-noise regime where contemperaneous flat fields are needed with G750M. In the interim, it is suggested that all observers using G750M longward of 7000 A obtain contemperaneous flats with their science data. See STIS ISR 97-15 for information regarding insertion of such flats in Phase 2." @default.
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- W1657001710 date "1997-01-01" @default.
- W1657001710 modified "2023-09-27" @default.
- W1657001710 title "STIS Near-IR Fringing: Basics and Use of Contemporaneous Flats for Extended Sources" @default.
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