skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: BRIGHTNESS AND FLUCTUATION OF THE MID-INFRARED SKY FROM AKARI OBSERVATIONS TOWARD THE NORTH ECLIPTIC POLE

Abstract

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 {+-} 0.23 nW m{sup -2} sr{sup -1} or 0.05% of the brightness at 24 {mu}m and at least 0.47 {+-} 0.14 nW m{sup -2} sr{sup -1} or 0.02% at 18 {mu}m. We conclude that the upper limit of the fluctuation in the zodiacal light toward the NEPmore » is 0.03% of the sky brightness, taking 2{sigma} error into account.« less

Authors:
;  [1];  [2];  [3]
  1. Korea Astronomy and Space Science Institute (KASI), Daejeon 305-348 (Korea, Republic of)
  2. Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)
  3. Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Kanagawa 252-5210 (Japan)
Publication Date:
OSTI Identifier:
22086254
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 760; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; BRIGHTNESS; COSMIC DUST; COSMIC PHOTONS; ENERGY SPECTRA; FLUCTUATIONS; IMAGES; INFRARED SPECTRA; INTERMEDIATE INFRARED RADIATION; NOISE; VISIBLE RADIATION; ZODIACAL LIGHT

Citation Formats

Pyo, Jeonghyun, Jeong, Woong-Seob, Matsumoto, Toshio, and Matsuura, Shuji, E-mail: jhpyo@kasi.re.kr. BRIGHTNESS AND FLUCTUATION OF THE MID-INFRARED SKY FROM AKARI OBSERVATIONS TOWARD THE NORTH ECLIPTIC POLE. United States: N. p., 2012. Web. doi:10.1088/0004-637X/760/2/102.
Pyo, Jeonghyun, Jeong, Woong-Seob, Matsumoto, Toshio, & Matsuura, Shuji, E-mail: jhpyo@kasi.re.kr. BRIGHTNESS AND FLUCTUATION OF THE MID-INFRARED SKY FROM AKARI OBSERVATIONS TOWARD THE NORTH ECLIPTIC POLE. United States. doi:10.1088/0004-637X/760/2/102.
Pyo, Jeonghyun, Jeong, Woong-Seob, Matsumoto, Toshio, and Matsuura, Shuji, E-mail: jhpyo@kasi.re.kr. Sat . "BRIGHTNESS AND FLUCTUATION OF THE MID-INFRARED SKY FROM AKARI OBSERVATIONS TOWARD THE NORTH ECLIPTIC POLE". United States. doi:10.1088/0004-637X/760/2/102.
@article{osti_22086254,
title = {BRIGHTNESS AND FLUCTUATION OF THE MID-INFRARED SKY FROM AKARI OBSERVATIONS TOWARD THE NORTH ECLIPTIC POLE},
author = {Pyo, Jeonghyun and Jeong, Woong-Seob and Matsumoto, Toshio and Matsuura, Shuji, E-mail: jhpyo@kasi.re.kr},
abstractNote = {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 {+-} 0.23 nW m{sup -2} sr{sup -1} or 0.05% of the brightness at 24 {mu}m and at least 0.47 {+-} 0.14 nW m{sup -2} sr{sup -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.},
doi = {10.1088/0004-637X/760/2/102},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 760,
place = {United States},
year = {2012},
month = {12}
}