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Alignment of dense ...
Alignment of dense molecular core morphology and velocity gradients with ambient magnetic fields
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- Pandhi, A. (author)
- University of Toronto
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- Friesen, R. K. (author)
- University of Toronto
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- Fissel, L. (author)
- Queen's University
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- Pineda, J. E. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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- Chen, M. C-Y (author)
- Queen's University
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- Di Francesco, J. (author)
- University of Victoria,National Research Council Canada
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- Ginsburg, A. (author)
- University of Florida
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- Kirk, H. (author)
- National Research Council Canada,University of Victoria
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- Myers, P. C. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Offner, S. S. R. (author)
- The University of Texas at Austin, USA
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- Punanova, Anna, 1989 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Quan, F. (author)
- University of Toronto
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- Redaelli, E. (author)
- Max-Planck-Institut für extraterrestrische Physik,Max Planck Institute for Extraterrestrial Physics
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- Rosolowsky, E. (author)
- University of Alberta
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- Scibelli, S. (author)
- University of Arizona
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- Seo, Y. M. (author)
- California Institute of Technology (Caltech)
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- Shirley, Y. (author)
- University of Arizona
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Monthly Notices of the Royal Astronomical Society. - 0035-8711 .- 1365-2966. ; 525:1, s. 364-392
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https://doi.org/10.1...
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Abstract
Subject headings
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- Studies of dense core morphologies and their orientations with respect to gas flows and the local magnetic field have been limited to only a small sample of cores with spectroscopic data. Leveraging the Green Bank Ammonia Survey alongside existing sub-millimeter continuum observations and Planck dust polarization, we produce a cross-matched catalogue of 399 dense cores with estimates of core morphology, size, mass, specific angular momentum, and magnetic field orientation. Of the 399 cores, 329 exhibit 2D v(LSR) maps that are well fit with a linear gradient, consistent with rotation projected on the sky. We find a best-fit specific angular momentum and core size relationship of J/M & PROP; R-1.82 & PLUSMN; 0.10, suggesting that core velocity gradients originate from a combination of solid body rotation and turbulent motions. Most cores have no preferred orientation between the axis of core elongation, velocity gradient direction, and the ambient magnetic field orientation, favouring a triaxial and weakly magnetized origin. We find, however, strong evidence for a preferred anti-alignment between the core elongation axis and magnetic field for protostellar cores, revealing a change in orientation from starless and prestellar populations that may result from gravitational contraction in a magnetically-regulated (but not dominant) environment. We also find marginal evidence for anti-alignment between the core velocity gradient and magnetic field orientation in the L1228 and L1251 regions of Cepheus, suggesting a preferred orientation with respect to magnetic fields may be more prevalent in regions with locally ordered fields.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- ISM: kinematics and dynamics
- stars: formation
- ISM: evolution
- ISM: structure
- ISM: clouds
- ISM: magnetic fields
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Pandhi, A.
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Friesen, R. K.
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Fissel, L.
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Pineda, J. E.
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Chen, M. C-Y
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Di Francesco, J.
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show more...
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Ginsburg, A.
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Kirk, H.
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Myers, P. C.
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Offner, S. S. R.
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Punanova, Anna, ...
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Quan, F.
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Redaelli, E.
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Rosolowsky, E.
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Scibelli, S.
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Seo, Y. M.
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Shirley, Y.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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Monthly Notices ...
- By the university
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Chalmers University of Technology