A Unified Model for Bipolar Outflows from Young Stars: Kinematic and Mixing Structures in HH 30
arxiv(2024)
摘要
The young stellar source HH 30 is a textbook example of an ionic optical jet
originating from a disk in an edge-on system shown by the HST. It has a remnant
envelope in ^12CO observed by ALMA. The optical jet is characterized by its
narrow appearance, large line width at the base, and high temperature inferred
from line diagnostics. Three featured structures can be identified, most
evident in the transverse position–velocity diagrams: an
extremely–high-velocity (EHV) wide-angle wind component with large spectral
widths in the optical, a very–low-velocity (VLV) ambient surrounding medium
seen in ^12CO, and a low-velocity (LV) region traced by ^12CO nested
both in velocity and location between the primary wind and ambient environment.
A layered cavity with multiple shells forms nested morphological and kinematic
structures around the optical jet. The atomic gas originating from the
innermost region of the disk attains a sufficient temperature and ionization to
emit brightly in forbidden lines as an optical jet. The wide-angle portion
expands, forming a low-density cavity. The filamentary ^12CO encompassing
the wind cavity is mixed and advected inward through the action of the magnetic
interplay of the wide-angle wind with the molecular ambient medium. The
magnetic interplay results in the layered shells penetrating deeply into the
vast cavity of tenuous atomic wind material. The HH 30 system is an ideal
manifestation of the unified wind model of , with
clearly distinguishable atomic and molecular species mixed through the atomic
lightly ionized magnetized wind and the surrounding cold molecular ambient
material.
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