Common correlations between 60, 100, and 140 μm intensities in the galactic plane and magellanic clouds

Yasunori Hibi, Hiroshi Shibai, Mitsunobu Kawada, Takafumi Ootsubo, Hiroyuki Hirashita

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

We investigated the far-infrared SED of the Galaxy and the Magellanic Clouds by using the COBE (COsmic Background Explorer)/DIRBE (Diffuse InfraRed Background Experiment) ZSMA (Zodi-Subtracted Mission Average) maps at wavelengths of 60 μm, 100 μm, and 140 μm. We analyzed three regions: the galactic plane region with the galactic latitude |b| < 5°, the Large Magellanic Cloud region, and the Small Magellanic Cloud region. Because the dust optical depth is much smaller in the far-infrared than in the visible, we could observe cumulative far-infrared radiation from regions with various interstellar radiation field in the line of sight. As a consequence of considering such an effect, we found a common far-infrared color correlation between the 140-100 μm and 100-60 μm intensity ratios in all three galaxies. Although this color correlation cannot be explained by any existing model, it fits very well the far-infrared color of nearby star-forming galaxies.

Original languageEnglish
Pages (from-to)509-519
Number of pages11
JournalPublications of the Astronomical Society of Japan
Volume58
Issue number3
DOIs
Publication statusPublished - 2006
Externally publishedYes

Keywords

  • Galaxies: ISM
  • Galaxies: Local Group
  • ISM: dust, extinction
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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