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首页> 外文会议>2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference >GNOSIS: An OH suppressing near-infrared spectrograph for astronomy using fibre Bragg gratings
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GNOSIS: An OH suppressing near-infrared spectrograph for astronomy using fibre Bragg gratings

机译：GNOSIS：使用光纤布拉格光栅的用于天文学的OH抑制近红外光谱仪

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摘要

Astronomical near-infrared spectroscopy is made difficult by the extremely bright and variable night sky background. The night sky surface brightness is more than a thousand times brighter at 1.6µm than at 0.4µm. Furthermore the brightness of the sky changes by factors of ∼10% on time-scales of minutes. Background-subtraction is therefore frustrated by high Poisson noise from the extreme brightness, and by systematic noise from the variability. Between 1.0 and 1.8 µm almost all of this background results from the rotational and vibrational de-excitiation of hydroxyl molecules located at ∼90 km in the atmosphere. The hydroxyl emission lines are intrinsically very bright, but very narrow. Between the OH lines the sky should be very dark; it is expected that the interline continuum is dominated by the zodiacal scattered light. Therefore selectively filtering the OH lines would enable deep near-infrared observations.
机译：天文学的近红外光谱法因极其明亮和可变的夜空背景而变得困难。夜空中的亮度在1.6µm时比在0.4µm时高出一千倍。此外，在几分钟的时间范围内，天空的亮度变化约10％。因此，极高亮度的高泊松噪声和可变性导致的系统噪声使背景扣除受挫。在1.0到1.8 µm之间，几乎所有的背景都是来自大气中约90 km处的羟基分子的旋转和振动去激励。羟基发射谱线本来就很亮，但是很窄。在OH线之间，天空应该很暗;预计线间连续体由黄道散射光主导。因此，选择性地过滤OH线将使您能够进行深红外观察。

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