UKIRT宽视场摄像机ZYJHK光度测量系统：2 MASS校准
The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
摘要：
在本文中，我们描述了测光校准的数据与近红外宽视场相机（WFCAM）的英国红外望远镜（UKIRT）。宽带ZYJHK数据直接从2 MASS点源校准，这是丰富的每个WFCAM指向。我们进行了分析的空间系统学的光度校准，内部和内部检测器，并表明，这些都存在于高达5%的水平WFCAM。虽然这些系统的原因尚未完全了解，他们的删除方法的开发和测试。应用校正程序后，WFCAM的光度校准被发现是准确的约1.5%的JHK波段和2%的ZY波段，满足调查要求。我们研究了2 MASS和WFCAM系统之间的转换，发现Z和Y校准对大E（B-V）值的星际红化效应敏感，但JHK滤波器基本上不受影响。我们测量一个小的修正WFCAM Y-波段测光需要放置WFCAM的织女星系统，并调查WFCAM测量公布的标准恒星从UKIRT微弱的标准列表。最后，我们提出了经验确定的吞吐量测量WFCAM。
英文摘要：
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.
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