Low-Resolution Spectrum of the Extragalactic Background Light with the AKARI InfraRed Camera
Low-Resolution Spectrum of the Extragalactic Background Light with the AKARI InfraRed Camera
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DOI：
10.1093/pasj/65.6.121
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发表时间：
2013-07
影响因子：
2.3
通讯作者：
K. Tsumura;T. Matsumoto;S. Matsuura;I. Sakon;T. Wada
中科院分区：
文献类型：
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作者：
K. Tsumura;T. Matsumoto;S. Matsuura;I. Sakon;T. Wada
河外背景光 (EBL) 作为来自银河系外部的综合光，包含有关早期宇宙和黑暗时代的信息。我们分析了 AKARI 红外相机 (IRC) 的低分辨率光谱模式在 1.8–5.3 µ m 波长范围内获得的天体物理漫发射光谱数据。尽管之前在此波长区域的 EBL 观测仅限于 DIRBE 和 IRTS 的观测，但这项研究增加了一个新的独立结果，由于对点源的灵敏度更高，银河恒星的污染可以忽略不计。通过分别与 DIRBE ZL 模型估计的 ZL 亮度和 100 µ m 尘埃热发射的相关性，减去另外两个主要前景成分，黄道光 (ZL) 和漫射银河光 (DGL)。各向同性发射以 EBL 形式获得，其显示出明显超出 < 4 µ m 处星系的积分光。获得的 EBL 与之前的 IRTS 和 DIRBE 测量结果一致。
The Extragalactic Background Light (EBL) as integrated light from outside of our Galaxy includes information about the early universe and the Dark Ages. We analyzed spectral data of the astrophysical diffuse emission obtained with the low-resolution spectroscopy mode on the AKARI Infra-Red Camera (IRC) in the 1.8–5.3 � m wavelength region. Although previous EBL observations in this wavelength region were restricted to observations by DIRBE and IRTS, this study adds a new independent result with negligible contamination of Galactic stars owing to higher sensitivity for point sources. Two other major foreground components, zodiacal light (ZL) and diffuse Galactic light (DGL), were subtracted by taking correlations with ZL brightness estimated by the DIRBE ZL model and with the 100 � m dust thermal emission, respectively. The isotropic emission was obtained as EBL, which shows significant excess over integrated light of galaxies at < 4 � m. The obtained EBL is consistent with the previous measurements by IRTS and DIRBE.