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Pyo, Jeonghyun,Matsumoto, Toshio,Jeong, Woong-Seob,Matsuura, Shuji IOP Publishing 2012 The Astrophysical journal Vol.760 No.2
<P>We present the smoothness of the mid-infrared sky from observations by the Japanese infrared astronomical satellite AKARI. AKARI monitored the north ecliptic pole (NEP) during its cold phase with nine wave bands covering from 2.4 to 24 mu m, out of which six mid-infrared bands were used in this study. We applied power-spectrum analysis to the images in order to search for the fluctuation of the sky brightness. Observed fluctuation is explained by fluctuation of photon noise, shot noise of faint sources, and Galactic cirrus. The fluctuations at a few arcminutes scales at short mid-infrared wavelengths (7, 9, and 11 mu m) are largely caused by the diffuse Galactic light of the interstellar dust cirrus. At long mid-infrared wavelengths (15, 18, and 24 mu m), photon noise is the dominant source of fluctuation over the scale from arcseconds to a few arcminutes. The residual fluctuation amplitude at 200 '' after removing these contributions is at most 1.04 +/- 0.23nWm(-2) sr(-1) or 0.05% of the brightness at 24 mu m and at least 0.47 +/- 0.14 nW m(-2) sr(-1) or 0.02% at 18 mu m. We conclude that the upper limit of the fluctuation in the zodiacal light toward the NEP is 0.03% of the sky brightness, taking 2 sigma error into account.</P>
Seasonal Variations of the Zodiacal Light toward the Ecliptic Poles at the Infrared Wavelengths
Jeonghyun Pyo,Il-Joong Kim,Woong-Seob Jeong,Dae-Hee Lee,Bongkon Moon,Youngsik Park,Sung-Joon Park,Won-Kee Park,Duk-Hang Lee,Uk-Won Nam,Wonyong Han,Kwang-Il Seon,Toshio Matsumoto,Min Gyu Kim,Hyung Mok 한국천문학회 2016 天文學會報 Vol.41 No.1