Cross Calibration of NICMOS and WFC3 in the Low-Count-Rate Regime

Details Cross Calibration of NICMOS and WFC3 in the Low-Count-Rate Regime Cross Calibration of NICMOS and WFC3 in the Low-Count-Rate Regime

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop12051p&link_type=abstract

HST Proposal ID #12051. Cycle 17

Physics

Scientific paper

NICMOS has played a key role in probing the deep near infrared regime for a decade. It has been the only instrument available to observe faint objects in the near infrared that are not observable from the ground. However, the calibration of NICMOS has turned out to be difficult in the low-count-rate regime. The NICMOS calibration team has extrapolated a power-law to describe the apparent non-linearity in the NICMOS detectors from measurements at 50-5000 ADU/s to flux counts around 0.1-1 ADU/s. Precise measurements of faint objects {such as SNe Ia at high redshift} require us to reduce the uncertainties from this extrapolation. Here we propose to determine the absolute zeropoint for faint objects by cross-calibrating the WFC3 and NICMOS detectors in observations of early type galaxies at redshifts z>1.;

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