Flat-fielding of ACS WFC grism data

Details Flat-fielding of ACS WFC grism data Flat-fielding of ACS WFC grism data

2002-12-02

arxiv.org/abs/astro-ph/0212021v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the 2002 HST Calibration Workshop

Scientific paper

In direct imaging, broad band flat-fields can easily be applied to correct deviation from uniform sensitivity across the detector field. However for slitless spectroscopy data the flat field is both field and wavelength dependent. The effect of the wavelength dependent flat field for the slitless G800L grism mode of the ACS Wide Field Channel (WFC) has been investigated from observations of a flux calibrator at different positions in the field. The results of various flat-fielding schemes are presented including application of a flat field cube derived from in-orbit broad band filter flat fields. Excellent results are reported with deviations in the extracted spectra <2% across the WFC field.

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