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Calibration and inter-calibration of the SNLS and SDSS-II supernova survey
Apr 18, 2012, 2:40 PM
Impact of calibration errors on astrophysics parameters
(LPNHE CNRS IN2P3)
With around 1 thousand type-Ia supernovae populating the Hubble
diagram, the uncertainty of the photometric calibration of the survey
now limits the precision of the cosmological parameters. We first
present the method used to establish a uniform photometric response of
the MegaCam instrument from CFHT used for SNLS. We then present a joint effort of the SNLS and SDSS collaborations to merge the photometric calibration
of the two largest supernova surveys to date. Main products are a
direct cross-calibration between the two surveys with a precision
reaching 0.5%, a better understanding of the survey uniformity, and an
improved absolute calibration with a redundant anchoring to the HST
white dwarf system. We describe the method, dataset and results and
discuss the remaining limitations and their origin.