Polarized Light from Massive Protoclusters (POLIMAP). I. Dissecting the Role of Magnetic Fields in the Massive Infrared Dark Cloud G28.37+0.07
Artikel i vetenskaplig tidskrift, 2024

Magnetic fields may play a crucial role in setting the initial conditions of massive star and star cluster formation. To investigate this, we report SOFIA-HAWC+ 214 μm observations of polarized thermal dust emission and high-resolution GBT-Argus C18O(1-0) observations toward the massive Infrared Dark Cloud (IRDC) G28.37+0.07. Considering the local dispersion of B-field orientations, we produce a map of the B-field strength of the IRDC, which exhibits values between ∼0.03 and 1 mG based on a refined Davis-Chandrasekhar-Fermi method proposed by Skalidis & Tassis. Comparing to a map of inferred density, the IRDC exhibits a B-n relation with a power-law index of 0.51 ± 0.02, which is consistent with a scenario of magnetically regulated anisotropic collapse. Consideration of the mass-to-flux ratio map indicates that magnetic fields are dynamically important in most regions of the IRDC. A virial analysis of a sample of massive, dense cores in the IRDC, including evaluation of magnetic and kinetic internal and surface terms, indicates consistency with virial equilibrium, sub-Alfvénic conditions, and a dominant role for B-fields in regulating collapse. A clear alignment of magnetic field morphology with the direction of the steepest column density gradient is also detected. However, there is no preferred orientation of protostellar outflow directions with the B-field. Overall, these results indicate that magnetic fields play a crucial role in regulating massive star and star cluster formation, and therefore they need to be accounted for in theoretical models of these processes.


Chi Yan Law

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

European Southern Observatory (ESO)

Jonathan Tan

University of Virginia

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

R. Skalidis

California Institute of Technology (Caltech)

Larry Morgan

Green Bank Observatory

Duo Xu

University of Virginia

Felipe de Oliveira Alves

Institut de Ciències de l'Espai (ICE) - CSIC

Ashley T. Barnes

European Southern Observatory (ESO)

Natalie Butterfield

Green Bank Observatory

P. Caselli


Giuliana Cosentino

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Francesco Fontani

Osservatorio Astrofisico di Arcetri

Jonathan D. Henshaw

Liverpool John Moores University

I. Jimenez-Serra

Instituto Nacional de Tecnica Aeroespacial

Wanggi Lim

California Institute of Technology (Caltech)

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 967 2 157


Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Fusion, plasma och rymdfysik



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