Erosion of a dense molecular core by a strong outflow from a massive protostar

Abstract

We present Atacama Large Millimeter/submillimeter Array Band 3 observations of N${}_2$H${}^{+}$ (1-0) and CH${}_3$CN (5-4), as well as Band 7 observations of the H${}_2$CO molecular line emissions from the protostellar system GGD 27-MM2(E). Through position-velocity diagrams along and across the outflow axis, we study the kinematics and structure of the outflow. We also fit extracted spectra of the CH${}_3$CN emission to obtain the physical conditions of the gas. We use the results to discuss the impact of the outflow on its surroundings. We find that N${}_2$H${}^{+}$ emission traces a dense molecular cloud surrounding GGD 27-MM2(E). We estimate that the mass of this cloud is $\sim$13.3-26.5 M${}_{\odot }$. The molecular cloud contains an internal cavity aligned with the H${}_2$CO-traced molecular outflow. The outflow, also traced by $\mathrm{C}{\mathrm{H}}_3\mathrm{CN}$, shows evidence of a collision with a molecular core (MC), as indicated by the distinctive increases in the distinct physical properties of the gas such as excitation temperature, column density, line width, and velocity. This collision results in an X-shape structure in the northern part of the outflow around the position of the MC, which produces spray-shocked material downstream in the north of MC as observed in position-velocity diagrams both along and across of the outflow axis. The outflow has a mass of 1.7-2.1 M${}_{\odot }$, a momentum of 7.8-10.1 M${}_{\odot }$ km s${}^{-1}$, a kinetic energy of 5.0-6.6$\times 10^{44}$ erg, and a mass loss rate of 4.9--6.0$\times 10^{-4}$ M${}_{\odot }$ yr${}^{-1}$. The molecular outflow from GGD 27-MM2(E) significantly perturbs and erodes its parent cloud, compressing the gas of sources such as MC and ALMA 12. The feedback from this powerful protostellar outflow contributes to maintain the turbulence in the surrounding area.

14 pages, 8 figures. Accepted by A&A

References in corpus (51)

• CASA, the Common Astronomy Software Applications for Radio Astronomy
• The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers
• How to Calculate Molecular Column Density
• A distance limited sample of massive molecular outflows
• Hydrodynamical Simulations of Jet- and Wind-driven Protostellar Outflows
• Chemical evolution in the early phases of massive star formation. I
• A CH3CN and HCO+ survey towards southern methanol masers associated with star formation
• eXtended CASA Line Analysis Software Suite (XCLASS)
• Jet/cloud collision, 3D gasdynamic simulations of HH 110
• Molecular ions in the protostellar shock L1157-B1
• Modeling the Physical Structure of the Low Density Pre-protostellar Core Lynds 1498
• ALMA reveals a large structured disk and nested rotating outflows in DG Tau B
• ALMA Observations of the HH 46/47 Molecular Outflow
• Complex Structure in Class 0 Protostellar Envelopes III: Velocity Gradients in Non-Axisymmetric Envelopes, Infall or Rotation?
• Proper Motions of the Jets in the Region of HH 30 and HL/XZ Tau. Evidence for a Binary Exciting Source of the HH 30 Jet
• First image of the L1157 molecular jet by the CALYPSO IRAM-PdBI survey
• Molecular outflows towards O-type young stellar objects
• The structure of the NGC1333-IRAS2 protostellar system on 500 AU scales: an infalling envelope, a circumstellar disk, multiple outflows, and chemistry
• Evolution and excitation conditions of outflows in high-mass star-forming regions
• Resolving the polarized dust emission of the disk around the massive star powering the HH~80-81 radio jet
• A Pulsed, Precessing Jet in Cepheus A
• IRAS 21391+5802: The Molecular Outflow and its Exciting Source
• Discovery of Extremely High Velocity "Molecular Bullets" in the HH 80-81 High-Mass Star-Forming Region
• Resolving the Circumstellar Disk Around the Massive Protostar Driving the HH 80-81 Jet
• Water Masers Toward Ultracompact HII Regions
• An Episodic Wide-angle Outflow in HH 46/47
• Confronting Outflow-Regulated Cluster Formation Model with Observations
• ATLASGAL-selected massive clumps in the inner Galaxy: VI. Kinetic temperature and spatial density measured with formaldehyde
• Assessing molecular outflows and turbulence in the protostellar cluster Serpens South
• Multiple monopolar outflows driven by massive protostars in IRAS 18162-2048
• Modeling the CO outflow in DG Tau B: Swept-up shells versus perturbed MHD disk wind
• VLA and BIMA observations toward the exciting source of the massive HH~80-81 outflow
• Modeling the accretion disk around the high-mass protostar GGD 27-MM1
• Millimeter and submillimeter high angular resolution interferometric observations: dust in the heart of IRAS 18162-2048
• Centimeter continuum observations of the northern head of the HH 80/81/80N jet: revising the actual dimensions of a parsec scale jet
• Snapshot of a magnetohydrodynamic disk wind traced by water maser observations
• HfS, Hyperfine Structure Fitting Tool
• A ringed pole-on outflow from DO Tauri revealed by ALMA
• A rotating molecular disk toward IRAS 18162-2048, the exciting source of HH 80-81
• Unveiling a cluster of protostellar disks around the massive protostar GGD27 MM1
• ALMA Reveals A Collision Between Protostellar Outflows in BHR71
• Outflows, envelopes, and disks as evolutionary indicators in Lupus YSOs
• Kinematics of a young low-mass star forming core: Understanding the evolutionary state of the First Core Candidate L1451-mm
• Spitzer imaging of the jet driving the NGC 2264 G outflow
• ALMA-IMF XIII: N${}_2$H${}^{+}$ kinematic analysis on the intermediate protocluster G353.41
• The APEX Large CO Heterodyne Orion Legacy Survey (ALCOHOLS). I. Survey overview
• Steady Twin-Jets Orientation: Implications For Their Formation Mechanism
• Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde V. The massive filament DR21
• Collision of molecular outflows in the L1448--C system
• Collision of protostellar jets in the star-forming region IC 1396N. Analysis of knot proper motions
• The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations

Cited by in corpus (1)

• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow