Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-16
Astronomy and Astrophysics
Astrophysics
Accepted on 2008 December 11 for publication in the MNRAS, 20 pages Remade Figure 11 which was corrupted during compression fo
Scientific paper
10.1111/j.1365-2966.2008.14387.x
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 broadband ZYJHK data are directly calibrated from 2MASS point sources which are abundant in every WFCAM pointing. We perform an analysis of spatial systematics in the photometric calibration, both inter- and intra-detector and show that these are present at up to the 5 per 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 application of the correction procedure the photometric calibration of WFCAM is found to be accurate to approximately 1.5 per cent for the JHK bands and 2 per 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 calibration is 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.
Hewett Paul C.
Hodgkin Simon T.
Irwin Mary Jane
Warren Stephen J.
No associations
LandOfFree
The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-94064