Speaker
Description
We investigate the magnetic field in the massive star-forming region Onsala 2 (ON2) in Cygnus-X complex using the polarization observations at 850µm performed as part of the James Clerk Maxwell Telescope (JCMT) B-Fields In Star-Forming Region Observations survey (BISTRO) with the POL-2 instrument. Our data cover the entire ON2 complex at a resolution of ~0.12 pc, allowing us to spatially resolve the polarized emission from the filamentary structures. We identify five clumps within ON2 and calculate the magnetic field strength via the Davis-Chandrasekhar-Fermi (DCF) method in each region. We analyze the energy budgets through the mass-to-flux ratio, plasma beta, and Alfvén Mach number to quantify the relative contributions of magnetic, gravitational, thermal, and turbulent energies, respectively. The results indicate that the magnetic field is less dominant than gravity but more influential than thermal pressure and turbulence. Additionally, we estimate the star formation rate (SFR) in the southern part of ON2, providing a quantitative reference for the star formation activity in this region.