HH 212: SMA Observations of a Remarkable Protostellar Jet

Abstract

HH 212 is a nearby (460 pc) protostellar jet discovered in H${}_2$ powered by a Class 0 source, IRAS 05413-0104, in the L1630 cloud of Orion. It is highly collimated and symmetric with matched pairs of bow shocks on either side of the source. We have mapped it in 850 $\mu$m continuum, SiO ($J=8-7$), CO ($J=3-2$), SO ($N_J=8_9-7_8$), HCO${}^{+}$ ($J=4-3$), and H${}^{13}$CO${}^{+}$ ($J=4-3$) emission simultaneously at $\sim$ 1${}^{\prime \prime }$ resolution with the Submillimeter Array (SMA). Thermal dust emission is seen in continuum around the source, mainly arising from an inner envelope (i.e., the inner part of a previously seen flattened envelope) and a possible disk. The inner envelope is also seen with rotation in CO, HCO${}^{+}$, and probably SO. Like H${}_2$ emission, CO and SiO emission are seen along the jet axis but extending closer to the source, tracing the bow shocks with a broad range of velocities and the continuous structures in between. SO emission is seen only around the source, forming a jetlike structure extending along the jet axis from the source, likely tracing the jet near the launching region. The jet is episodic and bending. It may also be slightly precessing as the jetlike SO structure shows a slight S-shaped symmetry about the source. A hint of jet rotation is also seen across the jet axis. Internal outflow shells are seen in CO and HCO${}^{+}$, associated with the bow shocks in the inner part of the jet. The bases of the HCO${}^{+}$ shells are seen with a hint of rotation similar to that seen in the inner envelope, probably consisted mainly of the material extended from the inner envelope and even the possible disk.

18 pages, 12 figures, Accepted by the ApJ

Cited by in corpus (30)

• Theory of Star Formation
• Modeling jet and outflow feedback during star cluster formation
• Formation and Atmosphere of Complex Organic Molecules of the HH 212 Protostellar Disk
• The ALMA view of the protostellar system HH212 - The wind, the cavity, and the disk
• ALMA Results of the Pseudodisk, Rotating disk, and Jet in Continuum and HCO+ in the Protostellar System HH 212
• Submillimeter arcsecond-resolution mapping of the highly collimated protostellar jet HH 211
• The CALYPSO IRAM-PdBI survey of jets from Class 0 protostars. Are jets ubiquitous in young stars ?
• Jet Motion, Internal Working Surfaces, and Nested Shells in the Protostellar System HH 212
• Assessing molecular outflows and turbulence in the protostellar cluster Serpens South
• X-winds in Action
• Deuterated methanol on Solar System scale around the HH212 protostar
• JWST Observations of Young protoStars (JOYS). HH 211: the textbook case of a protostellar jet and outflow
• Proper motions of collimated jets from intermediate-mass protostars in the Carina Nebula
• Angular Momentum in Disk Wind Revealed in the Young Star MWC349A
• Shaping the envelope of the asymptotic giant branch star W43A with a collimated fast jet
• Magneto-Centrifugal Origin for Protostellar Jets Validated through Detection of Radial Flow at the Jet Base
• Protostellar Evolution in Serpens Main: Possible Origin of Disk-Size Diversity
• Hot methanol from the inner region of the HH 212 protostellar system
• Submillimeter Array High-angular Resolution Observations of the Monoceros R2 Star Forming Cluster
• ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Evidence for a Molecular Jet Launched at an Unprecedented Early Phase of Protostellar evolution
• Ejection History of the IRAS 04166+2706 Molecular Jet
• The Giant Herbig-Haro Flow HH 212 and Associated Star Formation
• The HH 212 interstellar laboratory: astrochemistry as a tool to reveal protostellar disks on Solar System scales around a rising Sun
• A very young, compact bipolar H${}_2$O maser outflow in the intermediate-mass star-forming LkH$\alpha$ 234 region
• Evolution of the atomic component in protostellar outflows
• Episodic Model For Star Formation History and Chemical Abundances in Giant and Dwarf Galaxies
• Radio spectra of protostellar jets: Thermal and non-thermal emission
• Sulfur oxides tracing streamers and shocks at low mass protostellar disk-envelope interfaces
• Modeling of thermal and non-thermal radio emission from HH80-81 jet
• ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Deriving Inclination Angle and Velocity of the Protostellar Jets from their SiO Knots