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

Published online by Cambridge University Press:  13 January 2020

Alvaro Hacar ,
Mario Tafalla ,
Jan Forbrich  and
Josefa Grossschedl Open the ORCID record for Josefa Grossschedl [Opens in a new window]
Alvaro Hacar
Affiliation:
Leiden Observatory, Leiden University, P.O. Box 9513, 2300-RA Leiden, The Netherlands email: [email protected]
Mario Tafalla
Affiliation:
Observatorio Astronomico Nacional (IGN), C/ Alfonso XII, 3, E-28014, Madrid, Spain
Jan Forbrich
Affiliation:
Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB, UK
Josefa Grossschedl
Affiliation:
University of Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria
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Abstract

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The connection between low- and 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- and high-mass filaments.

Keywords

stars: formationISM: kinematics and dynamicsISM: cloudsradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S345: Origins: From the Protosun to the First Steps of Life , August 2018 , pp. 51 - 55
Copyright
© International Astronomical Union 2020 

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