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Title:
The UKIRT wide field camera ZYJHK photometric system: calibration from 2MASS
Authors:
Hodgkin, S. T.; Irwin, M. J.; Hewett, P. C.; Warren, S. J.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AB(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AC(Institute of Astronomy, Madingley Road, Cambridge CB3 0HA), AD(Astrophysics Group, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 394, Issue 2, pp. 675-692. (MNRAS Homepage)
Publication Date:
04/2009
Origin:
MNRAS
Astronomy Keywords:
surveys , infrared: general
DOI:
10.1111/j.1365-2966.2008.14387.x
Bibliographic Code:
2009MNRAS.394..675H

Abstract

In this paper, we describe the photometric calibration of data taken with the near-infrared Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope (UKIRT). The broad-band ZYJHK data are directly calibrated from Two-Micron All-Sky Survey (2MASS) point sources which are abundant in every WFCAM pointing. We perform an analysis of spatial systematics in the photometric calibration, both inter- and intradetector show that these are present at up to the ~5per cent level in WFCAM. Although the causes of these systematics are not yet fully understood, a method for their removal is developed and tested. Following the application of the correction procedure, the photometric calibration of WFCAM is found to be accurate to ~=1.5per cent for the JHK bands and 2per cent for the ZY bands, meeting the survey requirements. We investigate the transformations between the 2MASS and WFCAM systems and find that the Z and Y calibrations are sensitive to the effects of interstellar reddening for large values of E(B - V)', but that the JHK filters remain largely unaffected. We measure a small correction to the WFCAM Y-band photometry required to place WFCAM on a Vega system, and investigate WFCAM measurements of published standard stars from the list of UKIRT faint standards. Finally, we present empirically determined throughput measurements for WFCAM.
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