Structure of the interstellar medium around cas A

Yeunjin Kim, G. H. Rieke, O. Krause, K. Misselt, R. Indebetouw, K. E. Johnson

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


We present a 3yr series of observations at 24 μm with the Spitzer Space Telescope of the interstellar material in a 200′ × 200′ square area centered on Cassiopeia A. Interstellar dust heated by the outward light pulse from the supernova explosion emits in the form of compact, moving features. Their sequential outward movements allow us to study the complicated three-dimensional structure of the interstellar medium (ISM) behind and near Cassiopeia A. The ISM consists of sheets and filaments, with many structures on a scale of a parsec or less. The spatial power spectrum of the ISM appears to be similar to that of fractals with a spectral index of 3.5. The filling factor for the small structures above the spatial wavenumber k ∼0.5 cycles pc -1 is only ∼0.4%.

Original languageEnglish (US)
Pages (from-to)287-296
Number of pages10
JournalAstrophysical Journal
Issue number1
StatePublished - May 1 2008


  • ISM: structure
  • Infrared: ISM
  • Supernova remnants

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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