Calibration plan for J-PAS and J-PLUS surveys
J-PAS survey consists of an 8000 square degree photometric sky survey
with a set of 54 narrow-band, 2 mediumband and 1 broad-band filters. The
main goal is to produce a photo-redshift catalog of 15 millions red,
earlytype galaxies with a precision (z) 0:003(1 + z) to measure the
Baryonic Acoustic Oscillation (BAO). Such precision requires specific
care in the photometric calibration survey. This contribution presents
the calibration protocol developed at CEFCA for the J-PAS data and to be
applied from its first day. An auxiliary telescope JAST/T80 will perform
an initial survey, J-PLUS, available before J-PAS, to create a set of
flux calibrated stars in all J-PAS fields. Seven reference stars were
already chosen to calibrate in flux the J-PLUS survey. J-PLUS 12-filter
system was also specifically optimized to retrieve stellar parameters,
T, log(g), [Fe/H], through the fitting of flux calibrated models. J-PLUS
will be used as the standard network of flux calibrated stars to create
synthetic spectro-photometry for J-PAS 56-filter system and to achieve
the 1% photometric precision required for BAO measurements.