用AKARI InfraRed相机测量黄道光的低分辨率光谱
Low-Resolution Spectrum of the Zodiacal Light with AKARI InfraRed Camera
摘要:
我们提出了近红外和中红外黄道光光谱获得的AKARI红相机(IRC)。建立了一个包含278个光谱的漫反射天空的星表,覆盖了银河和黄道纬度的广泛范围。该星表的波长范围为1.8-5.3 μm,波长分辨率为λ/Δλ~20。为了构造光谱表,发展了专门用于漫射天空光谱的狭缝光谱学的高级约简方法。通过对不同季节和不同黄道纬度的光谱进行对比分析,证实了黄道光的散射分量和热发射分量在我们的波段内的光谱形状不随位置和时间而变化,但它们之间的相对亮度随位置而变化。我们还证实,在任何黄道纬度上,3-5 μm的黄道光发射的色温为300 ± 10 K。预计这种排放来自行星际空间的亚微米尘埃颗粒。
英文摘要:
We present the near- and mid-infrared zodiacal light spectrum obtained with the AKARI Infra-Red Camera (IRC). A catalog of 278 spectra of the diffuse sky covering a wide range of Galactic and ecliptic latitudes was constructed. The wavelength range of this catalog is 1.8-5.3 μm with wavelength resolution of λ/Δλ~20. Advanced reduction methods specialized for the slit spectroscopy of diffuse sky spectra are developed for constructing the spectral catalog. Based on the comparison analysis of the spectra collected in different seasons and ecliptic latitudes, we confirmed that the spectral shape of the scattered component and the thermal emission component of the zodiacal light in our wavelength range does not show any dependence on location and time, but relative brightness between them varies with location. We also confirmed that the color temperature of the zodiacal emission at 3-5 μm is 300+/-10 K at any ecliptic latitude. This emission is expected to be originated from sub-micron dust particles in the interplanetary space.
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