Revised Flux Calibration of the WFC3 G102 and G141 grisms

Details Revised Flux Calibration of the WFC3 G102 and G141 grisms Revised Flux Calibration of the WFC3 G102 and G141 grisms

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011wfc..rept....5k&link_type=abstract

ST-ECF Instrument Science Report WFC3-2011-05, 13 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wfc3, Wide Field Camera 3

Scientific paper

Based on observations of the primary HST flux standard stars GD153 and GD71 (Programs 11552 and 11936), the flux calibration of the WFC3 IR G102 and G141 grisms is revised. With the new calibrations the total throughput of HST + WFC3 G102 peaks at 1100 nm with 41% and is above 10% between 804 and 1153 nm. For G141 the total throughput in the +1st order peaks at 48% and is above 10% between 1081 and 1691 nm. The accuracy of the absolute flux calibration for point sources is about 2% (one standard deviation) and better than 5% for most of the field-of-view. We also provide revised aperture corrections for the +1st order as a function of wavelength for each grism and determine the large-scale throughput variations for the grisms as a function of the field-of-view.

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