English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Dust polarization observations from the Submillimeter Array (SMA) and theCaltech Submillimeter Observatory (CSO) are analyzed with the goal of providinga general tool to interpret the role of the magnetic field in molecular clouds.Magnetic field and dust emission gradient orientations are observed to showdistinct patterns and features. The angle $\delta$ between these twoorientations can be interpreted as a magnetic field alignment deviation,assuming the emission gradient orientation to coincide with the densitygradient orientation in the magnetohydrodynamics (MHD) force equation. In SMAhigh-resolution (collapsing) cores, additional symmetry properties in $\delta$can reveal accretion and outflow zones. All these observational findingssuggest the angle $\delta$ to be a relevant quantity that can assess the roleof the magnetic field. Indeed, when comparing this angle with the(projection-free) magnetic field significance \Sigma_B (Koch et al. 2012a), itis demonstrated that |\delta| yields an approximation to the change in\Sigma_B. Thus, changes in the magnetic field alignment deviation $\delta$trace changes in the role of the magnetic field. The angle $\delta$ isobservationally straightforward to determine, providing a tool to distinguishbetween zones of minor or significant magnetic field impact. This isexemplified by the CSO M+0.25+0.01, Mon R2, CO+0.02-0.02, M-0.02-0.07 sourcesand by the SMA high-resolution data from W51 e2, W51 North, Orion BN/KL andg5.89. Additional CSO sources are analyzed, providing further support of thisresult. Finally, based on the different features found in our sample of 31sources in total, covering sizes from large-scale complexes to collapsingcores, a schematic evolutionary scenario is proposed (abridged).

Interpreting the Role of the Magnetic Field from Dust Polarization Maps