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Hubble Space Telescope
IR Grism Master Sky Images

WFC3 Grism master sky images (Nov 2, 2015)

These are master sky images computed for the two WFC3/IR grisms, G102 and G141. Observations for the images are on-sky science images with astronomical sources aggressively masked. These images differ from the single images provided with the grism (aXe) calibration files in that separate images are obtained by combining individual reads where the observed background was dominated either by the nominal zodiacal continuum or by the terrestrial He 10830 Å emission line (see Brammer et al. 2014 ). When folded through the grism spectral orders, the distinct background spectra yield different two-dimensional structure in the observed background.

Further information on the construction of these images is provided in WFC3 ISR 2015-17 (Brammer, Ryan & Pirzkal 2015). For questions, please contact the STScI helpdesk:


FITS versions of the images are linked below. All of the FITS files are also available in a tarfile: grism_master_sky_v0.5.tar.gz.

Change history:

v0.5 - First release (11/02/15)

G102 Zodi G102 He 10830 Excess
G141 Zodi G141 He 10830 Excess
G141 Scattered light