• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on ground-based and airborne instrumentation for astronomy IV >Characterizing near-infrared sky brightness in the Canadian high arctic
【24h】

Characterizing near-infrared sky brightness in the Canadian high arctic

机译：描绘加拿大高北极地区近红外天空的亮度

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present the first measurements of the near-infrared (NIR), specifically the J-band, sky background in the Canadian High Arctic. There has been considerable recent interest in the development of an astronomical observatory in Ellesmere Island; initial site testing has shown promise for a world-class site. Encouragement for our study came from sky background measurements on the high Antarctic glacial plateau in winter that showed markedly lower NIR emission when compared to good mid-latitude astronomical sites due to reduced emission from the Meinel bands, i.e. hydroxyl radical (OH) airglow lines. This is possibly a Polar effect and may also be present in the High Arctic. To test this hypothesis, we carried out an experiment which measured the the J-band sky brightness in the High Arctic during winter. We constructed a zenith-pointing, J-band photometer, and installed it at the Polar Environment Atmospheric Research Laboratory (PEARL) near Eureka, Nunavut (latitude: 80° N). We present the design of our ruggedized photometer and our results from our short PEARL observing campaign in February 2012. Taken over a period of four days, our measurements indicate that theJ-band sky brightness varies between 15.5-15.9 mag arcsecsup2/sup; with a measurement uncertainty of 0.15 mag. Theuncertainty is entirely dominated by systematic errors present in our radiometric calibration. On our best night, we measured a fairly consistent sky brightness of 15.8 ± 0.15 mag arcsecsup2/sup. This is not corrected for atmospheric extinction, which is typically & 0.1 mag in the J-band on a good night. The measured sky brightness iscomparable to an excellent mid-latitude site, but is not as dark as claimed by the Antarctic measurements. Wediscuss possible explanations of why we do not see as dark skies as in the Antarctic. Future winter-long skybrightness measurements are anticipated to obtain the necessary statistics to make a proper comparison withthe Antarctic measurements.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
机译：我们介绍了加拿大高北极地区的近红外（NIR），特别是J波段天空背景的首次测量。最近人们对在埃尔斯米尔岛（Ellesmere Island）建立天文台的兴趣很大。最初的站点测试已显示出建立世界一流站点的希望。我们的研究鼓励来自冬季南极冰川高原的天空背景测量结果，与良好的中纬度天文学站点相比，由于梅尼尔带（即羟自由基（OH）气辉线）的减少，与良好的中纬度天文观测站点相比，其近红外辐射显着降低。这可能是一种极地效应，也可能出现在高北极地区。为了验证该假设，我们进行了一项实验，该实验测量了冬季高北极地区的J波段天空亮度。我们构建了一个指向天顶的J波段光度计，并将其安装在努纳武特（Nunavut）尤里卡（Eureka）附近的极地大气研究实验室（PEARL）（纬度：80°N）。我们介绍了加固型光度计的设计以及我们在2012年2月进行的简短PEARL观测活动的结果。在四天的时间内，我们的测量结果表明，J波段的天空亮度在15.5-15.9 mag arcsec 2 < / sup>;测量不确定度为0.15 mag。不确定性完全由我们的辐射校准中存在的系统误差决定。在我们最好的夜晚，我们测得的天空亮度相当稳定，为15.8＆plusmn; 0.15 mag arcsec 2 。对于大气的消光，这没有得到校正，通常为＜4。在晚安的J波段观看0.1格。测得的天空亮度可与出色的中纬度位置相比，但不如南极测量所要求的那么暗。我们讨论了为什么我们看不到南极的黑暗天空的可能解释。预计未来的冬季长空亮度测量将获得必要的统计数据，以与南极测量进行适当的比较。©（2012）COPYRIGHT光电仪器工程师协会（SPIE）。摘要的下载仅允许个人使用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号