Attenuation law of disk galaxies by the mega-grain approximation

Akio K. Inoue*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


The attenuation law through the clumpy interstellar medium (ISM) in disk galaxies is investigated. I adopted the mega-grain approximation, in which dusty clumps are regarded as very large particles (i.e. mega-grains), to treat the ISM dumpiness in a 1-D plane-parallel radiative transfer with multiple anisotropic scatterings. Further, a physical model of the dumpiness was introduced as an extention of the multi-phase ISM model. In this framework, the attenuation law is determined by three physical quantities in the ISM: the mean gas density, the mean pressure, and the dust-to-gas ratio. I found that the attenuation law of normal disk galaxies is much steeper than that of starburst galaxies observed by Calzetti et al.

Original languageEnglish
Pages (from-to)285-286
Number of pages2
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number577
Publication statusPublished - 2005
Externally publishedYes
EventThe Dusty and Molecular Universe - A Prelude to Herschel and ALMA - Paris, France
Duration: 2004 Oct 272004 Oct 29


  • Dust,extinction
  • Radiative transfer

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


Dive into the research topics of 'Attenuation law of disk galaxies by the mega-grain approximation'. Together they form a unique fingerprint.

Cite this