Brightness map of the zodiacal emission from the AKARI IRC All-Sky Survey

¹ Korea Astronomy and Space Science Institute (KASI), Daejeon 305-348, Republic of Korea
e-mail: jhpyo@kasi.re.kr
² Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Republic of Korea
³ Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Kanagawa 252-5210, Japan
⁴ Department of Science Education, Kangwon National University, Chuncheon 200-701, Republic of Korea
⁵ Division of Particle and Astrophysical Sciences, Nagoya University, Nagoya 464-8602, Japan
⁶ Astronomical Institute, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
⁷ Kobe University, Kobe 657-8501, Japan

Received: 4 February 2010
Accepted: 10 August 2010

Abstract

The first Japanese infrared space mission AKARI successfully scanned the whole sky with its two main instruments, the Infrared Camera (IRC) and the Far-Infrared Surveyor (FIS). The AKARI All-Sky Survey provides us with an invaluable opportunity to examine the zodiacal emission (ZE) over the entire sky in the leading as well as the trailing direction of the Earth’s motion. We describe our efforts to reduce the ZE brightness map from the AKARI’s survey in the 9   μm waveband. Compared with the interplanetary dust cloud model of Kelsall et al. (1998), the map requires an increase of the contribution of the resonance ring component to the ZE brightness by about 20%. We paid special attention to the north and south ecliptic pole brightnesses. The symmetry plane’s inclination and longitude of ascending node need to be modified from those in Kelsall et al. (1998) to reach a best fit to the observed pole brightness difference.