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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
HAWC+/SOFIA Polarimetry in L1688: Relative Orientation of Magnetic Field and Elongated Cloud Structure
Astrophysical Journal, Volume 918, No. 1, Article 39, Year 2021
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Description
We present a study of the relative orientation between the magnetic field and elongated cloud structures for the ρ Oph A and ρ Oph E regions in L1688 in the Ophiuchus molecular cloud. Combining inferred magnetic field orientation from HAWC+ 154 μm observations of polarized thermal emission with column density maps created using Herschel submillimeter observations, we find consistent perpendicular relative alignment at scales of 0.02 pc (33.″6 at d ≈ 137 pc) using the histogram of relative orientations (HRO) technique. This supports the conclusions of previous work using Planck polarimetry and extends the results to higher column densities. Combining this HAWC+ HRO analysis with a new Planck HRO analysis of L1688, the transition from parallel to perpendicular alignment in L1688 is observed to occur at a molecular hydrogen column density of approximately 1021.7 cm-2. This value for the alignment transition column density agrees well with values found for nearby clouds via previous studies using only Planck observations. Using existing turbulent, magnetohydrodynamic simulations of molecular clouds formed by colliding flows as a model for L1688, we conclude that the molecular hydrogen volume density associated with this transition is approximately ∼104 cm-3. We discuss the limitations of our analysis, including incomplete sampling of the dense regions in L1688 by HAWC+. © 2021. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Berthoud, Marc G.
United States, Evanston
Center for Interdisciplinary Exploration and Research in Astrophysics Ciera
United States, Chicago
The University of Chicago
Davidson, Jacqueline A.
Australia, Perth
The University of Western Australia
Fissel, Laura M.
Canada, Kingston
Queen’s University
Kwon, Woojin
South Korea, Seoul
Seoul National University
Li, D. H.
China, Beijing
Chinese Academy of Sciences
China, Beijing
University of Chinese Academy of Sciences
Li, Zhiyun
United States, Charlottesville
University of Virginia
Looney, Leslie W.
United States, Urbana
University of Illinois Urbana-champaign
Novak, Giles A.
United States, Evanston
Center for Interdisciplinary Exploration and Research in Astrophysics Ciera
United States, Evanston
Northwestern University
Sadavoy, Sarah I.
Canada, Kingston
Queen’s University
Santos, Fábio Pereira
Germany, Heidelberg
Max Planck Institute for Astronomy
Statistics
Citations: 5
Authors: 10
Affiliations: 14
Identifiers
Doi:
10.3847/1538-4357/ac0cf2
ISSN:
0004637X
Research Areas
Environmental