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

HH 212 is a nearby (400 pc) Class 0 protostellar system showing severalcomponents that can be compared with theoretical models of core collapse. Wehave mapped it in 350 GHz continuum and HCO+ J=4-3 emission with ALMA at up to~ 0.4" resolution. A flattened envelope and a compact disk are seen incontinuum around the central source, as seen before. The HCO+ kinematics showsthat the flattened envelope is infalling with small rotation (i.e., spiraling)into the central source, and thus can be identified as a pseudodisk in themodels of magnetized core collapse. Also, the HCO+ kinematics shows that thedisk is rotating and can be rotationally supported. In addition, to account forthe missing HCO+ emission at low-redshifted velocity, an extended infallingenvelope is required, with its material flowing roughly parallel to the jetaxis toward the pseudodisk. This is expected if it is magnetized with anhourglass B-field morphology. We have modeled the continuum and HCO+ emissionof the flattened envelope and disk simultaneously. We find that a jump indensity is required across the interface between the pseudodisk and the disk. Ajet is seen in HCO+ extending out to ~ 500 AU away from the central source,with the peaks upstream of those seen before in SiO. The broad velocity rangeand high HCO+ abundance indicate that the HCO+ emission traces internal shocksin the jet.

ALMA Results of the Pseudodisk, Rotating disk, and Jet in Continuum and HCO+ in the Protostellar System HH 212