Characterizing the red optical sky background fluctuations from narrow-band imaging
Characterizing the red optical sky background fluctuations from narrow-band imaging
复制标题
表征窄带成像的红色光学天空背景波动
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
K. Disseau
中科院分区：
文献类型：
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作者：
M. Puech;H. Flores;Y. Yang;M. Rodrigues;T. Gonçalves;F. Hammer;K. Disseau
探测和表征非常遥远星系的物理特性将是未来所有超大望远镜的突出科学案例之一，包括39米E-ELT。多目标光谱仪器是研究这些物体的潜在非常重要的工具，特别是基于纤维的概念。然而，检测和研究这种微弱和遥远的源将需要减去天空背景信号（即，OH气辉线之间），精度为1%。这需要对天空背景的时间和空间波动有精确和准确的了解。利用FORS 2窄带滤波器成像数据，我们目前正在研究9000 A时天空背景的波动。我们提出了初步的结果，天空背景波动，从这项研究的空间尺度达到4弧分，以及第一次瞥见这种波动的时间变化的时间尺度的顺序小时。这项研究（以及其他正在进行的补充研究）对于设计E-ELT的下一代光纤馈入仪器至关重要。
The detection and characterization of the physical properties of very distant galaxies will be one the prominent science case of all future Extremely Large Telescopes, including the 39m E-ELT. Multi-Object Spectroscopic instruments are potentially very important tools for studying these objects, and in particular fiber-based concepts. However, detecting and studying such faint and distant sources will require subtraction of the sky background signal (i.e., between OH airglow lines) with an accuracy of 1%. This requires a precise and accurate knowledge of the sky background temporal and spatial fluctuations. Using FORS2 narrow-band filter imaging data, we are currently investigating what are the fluctuations of the sky background at 9000A. We present preliminary results of sky background fluctuations from this study over spatial scales reaching 4 arcmin, as well as first glimpses into the temporal variations of such fluctuations over timescales of the order of the hour. This study (and other complementary on-going studies) will be essential in designing the next-generation fiber-fed instruments for the E-ELT.