Magnetic Fields in Star Formation: A Complete Compilation of All the DCF Estimations

The Davis-Chandrasekhar-Fermi (DCF) method provides an indirect way to estimate the magnetic field strength from statistics of magnetic field orientations. We compile all the previous DCF estimations from polarized dust emission observations and recalculate the magnetic field strength of the selected samples with the new DCF correction factors in Liu et al. We find the magnetic field scales with the volume density as B proportional to n (0.57). However, the estimated power-law index of the observed B-n relation has large uncertainties and may not be comparable to the B-n relation of theoretical models. A clear trend of decreasing magnetic viral parameter (i.e., increasing mass-to-flux ratio in units of critical value) with increasing column density is found in the sample, which suggests the magnetic field dominates the gravity at lower densities but cannot compete with the gravity at higher densities. This finding also indicates that the magnetic flux is dissipated at higher column densities due to ambipolar diffusion or magnetic reconnection, and the accumulation of mass at higher densities may be by mass flows along the magnetic field lines. Both sub-Alfvenic and super-Alfvenic states are found in the sample, with the average state being approximately trans-Alfvenic.

Automated summary

The DCF method provides a way to estimate magnetic field strength indirectly. Compilation of previous estimations using this method and recalculation with new correction factors reveals a proportionality between magnetic field strength and volume density. However, the power-law index of the observed B-n relation has uncertainties and might not correspond to theoretical models. The study also finds a trend of decreasing magnetic viral parameter with increasing column density, indicating dominance of magnetic field at lower densities and dissipation at higher densities.