The VISTA ZYJHKs photometric system: Calibration from 2MASS
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Abstract
In this paper we describe the routine photometric calibration of data taken
with the VIRCAM instrument on the ESO VISTA telescope. The broadband ZYJHKs
data are directly calibrated from 2MASS point sources visible in every VISTA
image. We present the empirical transformations between the 2MASS and VISTA,
and WFCAM and VISTA, photometric systems for regions of low reddening. We
investigate the long-term performance of VISTA+VIRCAM. An investigation of the
dependence of the photometric calibration on interstellar reddening leads to
these conclusions: (1) For all broadband filters, a linear colour-dependent
correction compensates the gross effects of reddening where
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1365-2966
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Science and Technology Facilities Council (ST/M007626/1)
Science and Technology Facilities Council (ST/N005805/1)
Science and Technology Facilities Council (ST/N000927/1)