Large angular scale fluctuations of near-infrared extragalactic background light based on the IRTS observations

Large angular scale fluctuations of near-infrared extragalactic background light based on the IRTS observations
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基于IRTS观测的近红外河外背景光大角尺度波动

DOI:
10.1093/pasj/psz063
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发表时间:
2019
影响因子:
2.3
通讯作者:
Tanaka Masahiro
Tanaka Masahiro
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Kim Min Gyu;Matsumoto Toshio;Lee Hyung Mok;Jeong Woong-Seob;Tsumura Kohji;Seo Hyunjong;Tanaka Masahiro

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利用空间红外望远镜(IRTS)上的近红外光谱仪(NIRS)所获得的数据,测量了1.6°角尺度下近红外河外背景光(NIREBL)的空间起伏。NIREBL的亮度是通过从观测到的天空减去前景成分,如黄道光、漫射银河光和综合星光来估计的。使用建立良好的模型和归档数据来估计前景组件。1.6和1.6的NIREBL波动与以前研究中的亚度尺度测量很好地联系在一起。总体而言,涨落呈现出中心在1°左右的宽凸起,功率向更大的角度减小,几乎具有单一的幂函数谱(即,表明大尺度的功率由源的随机空间分布主导)。在考察了几个已知的源、贡献者,如正常星系、高红移天体、晕内光和远红外宇宙背景之后,我们得出结论:它们中的任何一个都不能解释在1°尺度附近的超额涨落。
We measure the spatial fluctuations of the Near-Infrared Extragalactic Background Light (NIREBL) from 2° to 20° in angular scale at the 1.6 andusing data obtained with Near-Infrared Spectrometer (NIRS) on board the Infrared Telescope in Space (IRTS). The brightness of the NIREBL is estimated by subtracting foreground components such as zodiacal light, diffuse Galactic light, and integrated star light from the observed sky. The foreground components are estimated using well-established models and archive data. The NIREBL fluctuations for the 1.6 andconnect well toward the sub-degree scale measurements from previous studies. Overall, the fluctuations show a wide bump with a center at around 1° and the power decreases toward larger angular scales with nearly a single power-law spectrum (i.e.,, indicating that the large-scale power is dominated by the random spatial distribution of the sources. After examining several known sources, contributors such as normal galaxies, high-redshift objects, intra-halo light, and far-IR cosmic background, we conclude that the excess fluctuation at around the 1° scale cannot be explained by any of them.
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