The JCMT BISTRO Survey: Alignment between Outflows and Magnetic Fields in Dense Cores/Clumps

Abstract

We compare the directions of molecular outflows of 62 low-mass Class 0 and I protostars in nearby (<450 pc) starforming regions with the mean orientations of the magnetic fields on 0.05-0.5 pc scales in the dense cores/clumps where they are embedded. The magnetic field orientations were measured using the JCMT POL-2 data taken by the BISTRO-1 survey and from the archive. The outflow directions were observed with interferometers in the literature. The observed distribution of the angles between the outflows and the magnetic fields peaks between 15°a nd 35°. After considering projection effects, our results could suggest that the outflows tend to be misaligned with the magnetic fields by 50°±15°in three-dimensional space and are less likely (but not ruled out) randomly

The JCMT BISTRO Survey: Revealing the Diverse Magnetic Field Morphologies in Taurus Dense Cores with Sensitive Submillimeter Polarimetry

“…Furthermore, we observe a good alignment between the core Bfield (∼48°) and outflows (∼33°) in K04166 (Figures 2 and 3(d)), consistent with studies by Davidson et al (2011) and Chapman et al (2011). In contrast, we see a misalignment between the core mean B-field (∼121°) and the outflows (∼58°) in K04169 (Figures 2 and 3(e)), in accordance with studies by Hull et al (2013Hull et al ( , 2014, Zhang (2019), andYen et al (2021). Despite the fact that these two cores lie within ∼0.25 pc of each other, they exhibit different B-field/outflow orientations.…”

The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B

“…Hull et al (2013) find no tendency for magnetic field and outflow directions to align, instead finding perpendicular or random orientation of magnetic fields with respect to outflow directions based on observations of 16 low-mass protostars (Chapman et al 2013). Another recent study toward 62 low-mass young stellar objects has shown that magnetic field directions are misaligned with outflow directions by 50°± 15°in three-dimensional space, rather than being randomly oriented with respect to one other (Yen et al 2021).…”

Magnetic fields and outflows in the large Bok globule CB 54

“…Interferometric observations of large samples of protostellar sources have found that magnetic fields and outflows are typically randomly aligned, with the possibility of a well-aligned subset, on interferometric (1000s of au) scales (Hull et al 2014;Hull & Zhang 2019), while a comparable single-dish study found outflows to be misaligned with respect to magnetic fields by an average of 50 • ± 15 • in 3D, but did not rule out random orientation (Yen et al 2021). Recent observations have shown that in some cases, dust polarisation ★ E-mail: k.pattle@ucl.ac.uk (KP) around young protostars appears to trace their outflow cavity walls, suggesting compression and rearrangement of magnetic fields by outflow feedback (Hull et al 2020;Lyo et al 2021).…”