ALMA observations of the Orion Integral Filament: Evidence for fibers in a massive cloud

Alvaro Hacar, Mario Tafalla, Jan Forbrich, Josefa Grossschedl, Bruce G. Elmegreen, L. Viktor Tóth, Manuel Güdel

Research output: Contribution to journalArticle


The connection between low- A nd high-mass filaments is a matter of strong debate. In order to bridge these two filamentary regimes, we have investigated the internal structure of the Integral Filament in Orion using ALMA observations of the N2H+ (1-0) emission line in Band 3 in combination with previous single-dish data. Our ALMA mosaics, the largest of its kind carried out so-far in local clouds, reveal the presence of multiple sonic-like fibers inside this massive filament. In combination with the identification of fibers in regions such as Taurus, Musca, and Perseus, the first unambiguous detection of fibers in Orion highlights the importance of these gas substructures as the fundamental building blocks of both low- A nd high-mass filaments.

Original languageEnglish
Pages (from-to)51-55
Number of pages5
JournalProceedings of the International Astronomical Union
Publication statusAccepted/In press - Jan 1 2020


  • ISM: Clouds
  • ISM: Kinematics and dynamics
  • radio lines: ISM
  • stars: Formation

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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