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arXiv 0706.2683astro-ph
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在Las Campanas天文台通过光学中阶梯光谱学校准可蒸发水汽和225 GHz大气不透明度之间的关系

Calibration of the Relationship between Precipitable Water Vapor and 225 GHz Atmospheric Opacity via Optical Echelle Spectroscopy at Las Campanas Observatory

Joanna Thomas-Osip, Andrew McWilliam, M. M. Phillips, N. Morrell, I. Thompson, T. Folkers, M. Lopez-Morales

摘要:

我们报告可降水量(PWV)的测量在Las Campanas天文台使用的H2O线的光学光谱获得的麦哲伦阶梯光谱仪,并使用一个强大的技术,精确到5- 10%的计算。我们的PWV测量值和不透明度值之间的关系在225 GHz的校准是可能的,同时倾斜辐射计观测。基于此校准,我们提供了拉斯坎帕纳斯天文台在两个月的活动期间使用倾斜辐射计测量的冬季可降水量统计数据。2.8 +-0.3毫米的中值与VLT现场调查期间在附近的La Silla天文台测量的值一致。我们的结论是,在南半球的冬季月份,我们可以预期在拉斯坎帕纳斯天文台大约10%的时间内有良好的红外观测条件(<~1.5 mm)。

英文摘要:

We report precipitable water vapor (PWV) measurements made at Las Campanas Observatory using optical spectra of H2O lines obtained with the Magellan echelle spectrograph, and calculated using a robust technique that is accurate to 5-10%. Calibration of the relationship between our PWV measurements and opacity values at 225 GHz was made possible by simultaneous tipping radiometer observations. Based on this calibration, we present Las Campanas Observatory winter-time precipitable water vapor statistics, measured using the tipping radiometer, during a two month campaign. The median value of 2.8 +- 0.3 mm is consistent with that measured at the nearby La Silla Observatory during the VLT site survey. We conclude that, in the Southern hemisphere winter months, we can expect good conditions for infrared observing (<~1.5 mm) approximately 10% of the time at Las Campanas Observatory.

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