The Dynamics of the Envelope Surrounding the Protostar HH 211-mm

Abstract

We present a study of the structure and dynamics of the dense gas surrounding the HH 211-mm source, using VLA observations of the ammonia (1,1) and (2,2) inversion transitions. We find the envelope around this Class 0 source has an elongated geometry, extending about 104 AU in the direction perpendicular to the well-known HH 211 jet, and exhibits a velocity distribution consistent with rotation along the major axis. Our VLA observations indicate that the envelope is mostly in virial equilibrium. However, comparing our data with results from previous studies it appears that the gas within approximately 0.005 pc of the central protostar is undergoing dynamical collapse. The size of this collapsing radius may constrain the amount of mass that can eventually infall into the forming star. We also find that the envelope is mostly internally heated, most probably by radiation from the central protostar. In addition, we detect evidence of outflow-envelope interaction in the ammonia data. These include a velocity gradient in the dense gas along the outflow axis and significant line broadening that is spatially correlated with the jet and it might be the result of outflow-induced turbulence in the envelope.

Accepted for publication in ApJ

References in corpus (10)

• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• An Ammonia Spectral Atlas of Dense Cores in Perseus
• The COMPLETE Survey of Outflows in Perseus
• Complex Structure in Class 0 Protostellar Envelopes
• Rotation and Outflow motions in the very low-mass Class 0 protostellar system HH 211 at subarcsecond resolution
• Submillimeter arcsecond-resolution mapping of the highly collimated protostellar jet HH 211
• OVRO N2H+ Observations of Class 0 Protostars: Constraints on the Formation of Binary Stars
• High-Velocity Jets and Slowly Rotating Envelope in B335
• Probing the Protostellar Envelope around L1157: the Dust and Gas Connection
• Star formation in the vicinity of the IC 348 cluster

Cited by in corpus (23)

• SMA Observations of Class 0 Protostars: A High-Angular Resolution Survey of Protostellar Binary Systems
• Molecular Outflows Driven by Low-Mass Protostars. I. Correcting for Underestimates When Measuring Outflow Masses and Dynamical Properties
• Complex Structure in Class 0 Protostellar Envelopes II: Kinematic Structure from Single-Dish and Interferometric Molecular Line Mapping
• The enigmatic core L1451-mm: a first hydrostatic core? or a hidden VeLLO?
• Unveiling the Evolutionary Sequence from Infalling Envelopes to Keplerian Disks around Low-Mass Protostars
• Complex Structure in Class 0 Protostellar Envelopes III: Velocity Gradients in Non-Axisymmetric Envelopes, Infall or Rotation?
• The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). V. 18 Candidate Disks around Class 0 and I Protostars in the Perseus Molecular Cloud
• VLA and CARMA Observations of Protostars in the Cepheus Clouds: Sub-arcsecond Proto-Binaries Formed via Disk Fragmentation
• ALMA observations of the very young Class 0 protostellar system HH 211-mms: a 30-au dusty disk with a disk-wind traced by SO?
• The specific angular momentum radial profile in dense cores: improved initial conditions for disk formation
• A Pseudodisk Threaded with a Toroidal and Pinched Poloidal Magnetic Field Morphology in the HH 211 Protostellar System
• An observational correlation between magnetic field, angular momentum and fragmentation in the envelopes of Class 0 protostars?
• Discovery of A Binary System in IRAM 04191+1522
• Magnetic field structure in the Flattened Envelope and Jet in the young protostellar system HH 211
• Kinematics of a young low-mass star forming core: Understanding the evolutionary state of the First Core Candidate L1451-mm
• On the origin of C${}_4$H and CH${}_3$OH in protostellar envelopes
• Increasing mass-to-flux ratio from the dense core to the protostellar envelope around the Class 0 protostar HH 211
• A turbulent origin for the complex envelope kinematics in the young low-mass core Per-Bolo 58
• VLA and NOEMA view of the Bok Globule CB 17: the starless nature of a proposed FHSC candidate
• Very Large Array Ammonia Observations of the HH 111/HH 121 Protostellar System: a Detection of a New Source With a Peculiar Chemistry
• The Effelsberg survey of FU Orionis and EX Lupi objects I. -- Host environments of FUors/EXors traced by NH${}_3$
• The JCMT Transient Survey: Four Year Summary of Monitoring the Submillimeter Variability of Protostars
• Effects of magnetic field orientations in dense cores on gas kinematics in protostellar envelopes