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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Revised wavelength and spectral response calibrations for AKARI near-infrared grism spectroscopy: Post-cryogenic phase
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Revised wavelength and spectral response calibrations for AKARI near-infrared grism spectroscopy: Post-cryogenic phase

机译：修订的AKARI近红外Grism光谱仪的波长和光谱响应校准：低温后阶段

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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 at 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 25% smaller than that in Phases?1 and?2.
机译：我们使用AKARI上的红外热像仪为近红外Grism光谱中的二阶光污染提出了一个新的校准标准，特别是针对卫星的低温后阶段（第3期）。继我们先前在低温阶段（阶段1和阶段2）的工作之后，对波长和光谱响应校准进行了修改。与阶段1和阶段2不同，在阶段3中，仪器的温度不稳定，并从40 K逐渐升高到47K。为了评估温度升高的影响，我们将阶段3分为三个子阶段，并分别进行了校准。如同在阶段1和阶段2中一样，我们确认由于每个子阶段中砂料的折射率的波长依赖性而存在污染。三个子相的波长校准曲线彼此重合，并且没有显示任何明显的温度依赖性。从阶段3开始到结束，响应随温度降低〜10％。我们以线性关系近似了响应的温度依赖性，并得出了温度的校正因子。发现第二阶段光污染相对于第一阶段光的相对分数比阶段α1和阶段2中的相对分数小25％。

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