AKARI近红外光栅Spectroscopy的波长和光谱响应校正：低温后阶段
Revised Wavelength and Spectral Response Calibrations for AKARI Near-Infrared Grism Spectroscopy: Post-Cryogenic Phase
摘要：
我们提出了一种新的校准的二阶光污染的近红外棱镜光谱与AKARI上的红外相机，特别是后低温阶段的卫星（第3阶段）。根据我们先前在低温阶段（阶段1和2）的工作，对波长和光谱响应校准进行了修订。与阶段1和阶段2不同，在阶段3期间，仪器的温度不稳定，从40 K逐渐升高到47 K。为了评估温度升高的影响，我们将阶段3分为三个子阶段，并分别进行校准。与阶段1和2中一样，我们确认了在每个子阶段中存在由于棱镜材料的折射率的波长依赖性而导致的污染。三个子相的波长校准曲线彼此一致，并且没有显示出任何显著的温度依赖性。从第3阶段开始到结束，响应随温度降低约10%。我们近似的温度依赖性的响应作为一个线性关系，并推导出作为温度的函数的校正因子。发现二阶光污染相对于一阶光的相对分数比阶段1和阶段2小25%。
英文摘要：
We present a new calibration for the second-order light contamination in the near-infrared grism spectroscopy with the Infrared Camera aboard AKARI, specifically for the post-cryogenic phase of the satellite (Phase 3). Following our previous work on the cryogenic phase (Phases 1 and 2), the wavelength and spectral response calibrations were revised. Unlike Phases 1 and 2, during Phase 3, the temperature of the instrument was not stable and gradually increased from 40 to 47 K. To assess the effect of the temperature increase, we divided Phase 3 into three sub-phases and performed the calibrations separately. As in Phases 1 and 2, we confirmed that there was contamination due to the wavelength dependence of the refractive index of the grism material in every sub-phase. The wavelength calibration curves for the three sub-phases coincided with each other and did not show any significant temperature dependence. The response decreased with temperature by ~10% from the beginning to the end of Phase 3. We approximated the temperature dependence of the response as a linear relation and derived a correction factor as a function of temperature. The relative fraction of the second-order light contamination to the first-order light was found to be by 25% smaller than in Phases 1 and 2.
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