AKARI近红外光栅Spectroscopy的波长和光谱响应校正：低温相
Revised Wavelength and Spectral Response Calibrations for AKARI Near-Infrared Grism Spectroscopy: Cryogenic Phase
摘要：
我们进行修订的光谱校准的AKARI近红外棱镜定量校正的波长依赖性折射率的影响。在波长2.5- 5.0 μ m范围内的近红外棱镜，在3.6 μ m处的光谱分辨率为120，被发现受到波长大于4.9 μ m的二阶光的污染，这对红色物体来说尤其严重。首先，我们提出了考虑棱镜的折射率作为波长的函数的波长校准的第一次。我们发现，以前的解决方案是积极的移动高达0.01微米相比，修订后的波长在2.5- 5.0微米。此外，我们证明了二阶污染发生，即使有一个完美的排序过滤器由于折射率的波长依赖性。其次，从两种不同颜色的标准物体上同时获得了系统对一阶光和二阶光的光谱响应。来自二阶光的响应表明低于2.5微米的阶分类滤光器的泄漏。检测器的输出和第一和第二阶光的强度之间的关系被形式化的矩阵方程，结合两个订单。通过求解矩阵方程，可以实现对二阶污染光的去除。新的校准将棱镜模式的可用光谱覆盖范围从4.9微米扩展到5.0微米。该修订可用于研究这些扩展波长的光谱特征，例如，附近活动星系核内的一氧化碳基本振转吸收。
英文摘要：
We perform revised spectral calibrations for the AKARI near-infrared grism to quantitatively correct for the effect of the wavelength-dependent refractive index. The near-infrared grism covering the wavelength range of 2.5--5.0 micron with a spectral resolving power of 120 at 3.6 micron, is found to be contaminated by second-order light at wavelengths longer than 4.9 micron which is especially serious for red objects. First, we present the wavelength calibration considering the refractive index of the grism as a function of the wavelength for the first time. We find that the previous solution is positively shifted by up to 0.01 micron compared with the revised wavelengths at 2.5--5.0 micron. In addition, we demonstrate that second-order contamination occurs even with a perfect order-sorting filter owing to the wavelength dependence of the refractive index. Second, the spectral responses of the system from the first- and second-order light are simultaneously obtained from two types of standard objects with different colors. The response from the second-order light suggests leakage of the order-sorting filter below 2.5 micron. The relations between the output of the detector and the intensities of the first- and second-order light are formalized by a matrix equation that combines the two orders. The removal of the contaminating second-order light can be achieved by solving the matrix equation. The new calibration extends the available spectral coverage of the grism mode from 4.9 micron up to 5.0 micron. The revision can be used to study spectral features falling in these extended wavelengths, e.g., the carbon monoxide fundamental ro-vibrational absorption within nearby active galactic nuclei.
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