Magnetic field in a massive star-forming region, G35.20-0.74N

ABSTRACT :
Magnetic field plays an important role in star formation by regulating core fragmentation and resisting gravitational collapse. We present dust polarization observations in ALMA band 6 toward a massive star-forming region, G35.20-0.74N (G35), which are carried out as part of Magnetic Fields in Massive Star-forming Regions (MagMaR) survey. Magnetic field orientations are aligned along filamentary structures of G35. The embedded cores are also formed aligned the filamentary structures. We obtain map of magnetic field strengths in G35 using the Davis-Chandrasekhar-Fermi (DCF) method. We also use H13CO+ and C33S molecular line data to estimate velocity dispersion for the DCF method. Magnetic field strengths range between 1 and 20 mG. We also estimate mass-to-flux ratio and Alfven Mach number to discuss relative importance of magnetic field compared to gravity and turbulence.