Poster Presentation
The JCMT BISTRO Survey: Unveiling the Magnetic Fields around Galactic Center
Presenter: Meng Zhe Yang (National Tsing Hua University)
We obtain the 450um and 850um dust continuum polarization observations around inner part of Central Molecular Zone (CMZ) in Milky Way, which are parts of the James Clerk Maxwell Telescope (JCMT) B-Fields In Star-Forming Region Observations (BISTRO) Survey with POL-2 instrument. The directions of magnetic fields are perpendicular to the polarization directions, while the magnetic field strength can be obtained through the Davis-Chandrasekhar-Fermi (DCF) Method. The DCF method requires column density, polarization angle dispersion and velocity dispersion. We obtain the column density from the intensity of BISTRO data and Herschel Hi-GAL temperature map, which was generated by the PPMAP tool. The polarization angle dispersion is derived from the "unsharp method" (Pattle et al. 2017). The velocity dispersion is estimated from the 13CO (J=2-1) CMZ data from the CHIMPS2 survey with multi-Gaussian fitting. Furthermore, we discuss the alignment efficiency within observed region by comparing the 450um/850um polarization percentage with intensity, and determine the mass-to-flux ratio to analyze how the magnetic fields influence the star formation process.
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