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- W2787958410 abstract "Probing magnetic field directions in the interstellar medium is generally difficult even with the use of the polarimetry. The recent development of the Velocity Gradient Technique (VGT) allows observers to probe magnetic field directions with spectroscopic data. However, the quality of the spectroscopic maps highly influences the prediction of magnetic field directions using VGT. In this paper, we employ the method of Principle Component Analysis (PCA) to extract the turbulent part of the spectroscopic cubes for VGT to apply. By using synthetic observation data from numerical simulations, we show that PCA is similar to a method of wavenumber filtering along the velocity axis. With the filtering, the performance of PCA-VGT is significantly improved in tracing magnetic field directions, especially in the presence of noise both in the subsonic and supersonic region. We select a GALFA-HI region nearly Galactic zenith for testing." @default.
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- W2787958410 date "2018-02-24" @default.
- W2787958410 modified "2023-09-24" @default.
- W2787958410 title "Improving Velocity Gradient Technique with Principal Component Analysis" @default.
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