Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 513, Issue 3, Pages 3493-3509Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac1060
Keywords
magnetic fields; turbulence; ISM: general; ISM: magnetic fields; Galaxy: centre
Categories
Funding
- NASA [TCAN 144AAG1967, ATP AAH7546]
- NSF [AST 1715754]
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The Velocity Gradient Technique (VGT) provides an attractive solution for measuring and mapping magnetic fields in the interstellar medium. By applying the VGT to CO data cubes, researchers were able to decompose the magnetic field maps and investigate their significance. The results showed that the VGT has the potential to decompose velocity or density-dependent magnetic structures.
Measuring magnetic fields in the interstellar medium and obtaining their distribution along line-of-sight (LOS) is very challenging with the traditional techniques. The Velocity Gradient Technique (VGT), which utilizes anisotropy of magnetohydrodynamic turbulence, provides an attractive solution. 'targeting the central molecular zone (CMZ), we test this approach by applying the VGT to (CO)-C-12 and (CO)-C-13 (J = 1 0) data cubes. We first used the scousepy algorithm to decompose the CO line emissions into separate velocity components, and then we constructed pseudo-Stokes parameters via the VGT to map the plane-of-the-sky magnetic fields in three-dimension. We present the decomposed magnetic field maps and investigate their significance. While the LOS integrated magnetic field orientation is shown to be consistent with the polarized dust emission from the Planck survey at 353 GHz, individual velocity components may exhibit different magnetic fields. We present a scheme of magnetic field configuration in the CMZ based on the decomposed magnetic fields. In particular, we observe a nearly vertical magnetic field orientation in the dense clump near the Sgr B2 and a change in the outflow regions around the Sgr A*. Two high-velocity structures associated with an expanding ring in the CMZ show distinct swirling magnetic field structures. These results demonstrate the potential power of the VGT to decompose velocity or density-dependent magnetic structures.
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