Data from: Evidence for the gravity-driven and magnetically-regularized gas flows feeding the massive protostellar cluster in Cep A

The hierarchical interplay among gravity, magnetic fields, and turbulence
in forming massive protostellar clusters remains elusive. We present
high-resolution (∼14 arcsec ≃ 0.05 pc) 850 μm dust polarization and C18O
line observations of Cepheus A using JCMT SCUBA-2/POL-2 and HARP. Our
analysis reveals aligned gravitational (G), magnetic (B), and velocity
fields (K), with an energy hierarchy of EG > EB > EK.
Gravity, as the primary driver, induces gas flows and drags in B-field
lines. Magnetic tension, as a secondary force, regulates turbulence,
enabling ordered flows with an accretion rate of ∼2.1×10−4 M⊙ yr−1. This
challenges the conventional view of B-fields resisting collapse in the
clump/hub scale, instead showing cooperation with gravity. The ∼0.6 pc
clump-scale B-field (with mean PA ∼45°) aligns coherently with fields at
cloud (∼5 pc), core (∼0.05 pc), and disk (∼2000 AU) scales, offering new
insights into multiscale star formation dynamics.