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- W4383314867 abstract "ABSTRACT The mapping of the Galactic magnetic field (GMF) in three dimensions is essential to comprehend various astrophysical processes that occur within the Milky Way. This study endeavours to map the GMF by utilizing the latest MM2 technique, the velocity gradient technique (VGT), the column density variance approach, and the Galactic Arecibo L-band Feed Array HI survey of neutral hydrogen (H i) emission. The MM2 and VGT methods rely on an advanced understanding of magnetohydrodynamics turbulence to determine the plane-of-the-sky magnetic field strength and orientation, respectively. The H i emission data, combined with the Galactic rotational curve, give us the distribution of H i gas throughout the Milky Way. By combining these two techniques, we map the GMF orientation and strength, as well as the Alfvén Mach number MA in 3D for a low-galactic latitude (b < 30o) region close to the Perseus Arm. The analysis of column density variance gives the sonic Mach number Ms distribution. The results of this study reveal the sub-Alfvénic and subsonic (or trans-sonic) nature of the H i gas. The variation of mean MA along the line of sight approximately ranges from 0.6 to 0.9, while that of mean Ms is from 0.2 to 1.5. The mean magnetic field strength varies from 0.5 to 2.5 µG exhibiting a decreasing trend towards the Galaxy’s outskirt. This work provides a new avenue for mapping the GMF, especially the magnetic field strength, in 3D. We discuss potential synergetic applications with other approaches." @default.
- W4383314867 created "2023-07-07" @default.
- W4383314867 creator A5014797090 @default.
- W4383314867 creator A5028300061 @default.
- W4383314867 date "2023-07-06" @default.
- W4383314867 modified "2023-10-17" @default.
- W4383314867 title "Mapping the Galactic magnetic field orientation and strength in three dimensions" @default.
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