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  HAWC+/SOFIA polarimetry in L1688: Relative orientation of magnetic field and elongated cloud structure

Lee, D., Berthoud, M., Chen, C.-Y., Cox, E. G., Davidson, J. A., Encalada, F. J., et al. (2021). HAWC+/SOFIA polarimetry in L1688: Relative orientation of magnetic field and elongated cloud structure. The Astrophysical Journal, 918(1): 39. doi:10.3847/1538-4357/ac0cf2.

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Lee, Dennis, Author
Berthoud, Marc, Author
Chen, Che-Yu, Author
Cox, Erin G., Author
Davidson, Jacqueline A., Author
Encalada, Frankie J., Author
Fissel, Laura M., Author
Harrison, Rachel, Author
Kwon, Woojin, Author
Li, Di, Author
Li, Zhi-Yun, Author
Looney, Leslie W., Author
Novak, Giles, Author
Sadavoy, Sarah, Author
Santos, Fabio P., Author
Segura-Cox, Dominique1, Author              
Stephens, Ian, Author
Affiliations:
1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: 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+.

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 Dates: 2021-09-03
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ac0cf2
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 918 (1) Sequence Number: 39 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3