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THE DIFFUSE NEAR-INFRARED BACKGROUND SPECTRUM FROM AKARI
Tsumura Kohji,Matsumoto Toshio,Matsuura Shuji,Sakon Itsuki,Wada Takehiko 한국천문학회 2017 天文學論叢 Vol.32 No.1
We analyzed spectral data of the astrophysical diffuse emission obtained with the low-resolution spectroscopy mode on the AKARI InfraRed Camera (IRC) in the 1.8-5.3 μm wavelength region. Advanced reduction methods specialized for slit spectroscopy of diffuse sky spectra have been developed,and a catalog of 278 spectra of the diffuse sky covering a wide range of Galactic and ecliptic latitudes was constructed. Using this catalog, two other major foreground components, the zodiacal light (ZL) and the diffuse Galactic light (DGL),were separated and subtracted by taking correlations with ZL brightness estimated by the DIRBE ZL model and with the 100 μm dust thermal emission, respectively. The isotropic emission was interpreted as the extragalactic background light (EBL), which shows significant excess over the integrated light of galaxies at < 4 μm.