Physics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..16r&link_type=abstract
"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T
Physics
Scientific paper
We present a new method to measure photometry zero-points using high redshift red-sequence galaxies. This method allows us to measure the HST NICMOS F110W zero-point close to the sky level and, thus, avoid calibration errors due to the poorly constrained HgCdTe non-linearity at these faint flux levels. This is the level at which almost all of the highest redshift supernovae observations are obtained with NICMOS camera. We combined HST optical and VLT near-infrared observations of distant red-sequence galaxies to constraint their spectral energy distribution and thus derived NICMOS calibration from the observed fluxes with NIC2 F110W. Using 23 red-sequence galaxies in three distant galaxy clusters, we determine the absolute NICMOS F110W zero point to 2.5% accuracy. This result shows that the nonlinearity is over-corrected using the standard STScI pipeline leading to a significant zero-point offset at the sky level. This work has been supported by the Office of Science, U.S. Department of Energy, through contract DE-AC02-05CH11231 and in part by NASA through grants associated with HST-GO-10496 and HST-GO-11799.
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