skip to main content

SciTech ConnectSciTech Connect

Title: MODELING OF THE ZODIACAL EMISSION FOR THE AKARI/IRC MID-INFRARED ALL-SKY DIFFUSE MAPS

The zodiacal emission, which is the thermal infrared (IR) emission from the interplanetary dust (IPD) in our solar system, has been studied for a long time. Nevertheless, accurate modeling of the zodiacal emission has not been successful to reproduce the all-sky spatial distribution of the zodiacal emission, especially in the mid-IR where the zodiacal emission peaks. Therefore, we aim to improve the IPD cloud model based on Kelsall et al., using the AKARI 9 and 18 μm all-sky diffuse maps. By adopting a new fitting method based on the total brightness, we have succeeded in reducing the residual levels after subtraction of the zodiacal emission from the AKARI data and thus in improving the modeling of the zodiacal emission. Comparing the AKARI and the COBE data, we confirm that the changes from the previous model to our new model are mostly due to model improvements, but not temporal variations between the AKARI and the COBE epoch, except for the position of the Earth-trailing blob. Our results suggest that the size of the smooth cloud, a dominant component in the model, is about 10% more compact than previously thought, and that the dust sizes are not large enough to emit blackbodymore » radiation in the mid-IR. Furthermore, we detect a significant isotropically distributed IPD component, owing to an accurate baseline measurement with AKARI.« less
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602 (Japan)
  2. Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153-8902 (Japan)
  3. Korea Astronomy and Space Science Institute, Daejeon 305-348 (Korea, Republic of)
  4. Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)
Publication Date:
OSTI Identifier:
22519991
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 151; Journal Issue: 3; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLACKBODY RADIATION; BRIGHTNESS; COMPARATIVE EVALUATIONS; COSMIC DUST; INTERMEDIATE INFRARED RADIATION; PHOTON EMISSION; PLANETS; SOLAR SYSTEM; SPATIAL DISTRIBUTION; VARIATIONS