论文标题
基于测量的天空亮度和大气灭绝的大型红外望远镜的灵敏度估计
The estimate of sensitivity for large infrared telescopes based on measured sky brightness and atmospheric extinction
论文作者
论文摘要
为了评估受大气，仪器和检测器噪声影响的地面红外望远镜灵敏度，我们构建了一个灵敏度模型，该模型可以计算限制幅度和信噪比（$ s/n $）。该模型通过在Ali和Daocheng站点获得的$ \ rm M'$ - Band Sky亮度和大气灭绝的试验测量测试。我们发现，与$ \ rm M'$ - 频段Sky Brockd Background Noise相比，$ -135^\ rm C $的出色科学探测器和仪器引起的噪音可以被忽略。因此，当10 m望远镜的$ s/n = 3 $且总曝光时间为1秒时，大气限制的幅度为$ 13.01^{\ rm m} $在Ali和$ 12.96^{\ rm M} $在Daocheng处。即使在不那么理想的情况下，即，深色低温检测器的读数噪声小于$ 200E^ - $，并且仪器的冷却至$ -87.2^\ circ \ rm c $，上面的幅度下来的幅度降低了$ 0.056^{\ rm M} $。因此，根据给定红外频带中大型望远镜的观察要求，天文学家可以将此灵敏度模型用作指导现场调查，检测器选择和仪器热控制的工具。
In order to evaluate the ground-based infrared telescope sensitivity affected by the noise from the atmosphere, instruments and detectors, we construct a sensitivity model that can calculate limiting magnitudes and signal-to-noise ratio ($S/N$). The model is tested with tentative measurements of $\rm M'$-band sky brightness and atmospheric extinction obtained at the Ali and Daocheng sites. We find that the noise caused by an excellent scientific detector and instruments at $-135^\circ \rm C$ can be ignored compared to the $\rm M'$-band sky background noise. Thus, when $S/N=3$ and total exposure time is 1 second for 10 m telescopes, the magnitude limited by the atmosphere is $13.01^{\rm m}$ at Ali and $12.96^{\rm m}$ at Daocheng. Even under less-than-ideal circumstances, i.e., the readout noise of a deep cryogenic detector is less than $200e^-$ and the instruments are cooled to below $-87.2^\circ \rm C$, the above magnitudes decrease by $0.056^{\rm m}$ at most. Therefore, according to observational requirements with a large telescope in a given infrared band, astronomers can use this sensitivity model as a tool for guiding site surveys, detector selection and instrumental thermal-control.
