ALMA Observations of the massive molecular outflow G331.512-0.103 II: physical properties, kinematics, and geometry modeling

Abstract

We present observations and analysis of the massive molecular outflow G331.512-0.103, obtained with ALMA band 7, continuing the work from Merello et al. (2013). Several lines were identified in the observed bandwidth, consisting of two groups: lines with narrow profiles, tracing the emission from the core ambient medium; and lines with broad velocity wings, tracing the outflow and shocked gas emission. The physical and chemical conditions, such as density, temperature, and fractional abundances are calculated. The ambient medium, or core, has a mean density of $\sim 5\times 10^6$ cm${}^{-3}$ and a temperature of $\sim 70$ K. The SiO and SO${}_2$ emission trace the very dense and hot part of the shocked outflow, with values of $n_{{\mathrm{H}}_2}\sim 10^9$ cm${}^{-3}$ and $T\sim 160-200$ K. The interpretation of the molecular emission suggests an expanding cavity geometry powered by stellar winds from a new-born UCHII region, alongside a massive and high-velocity molecular outflow. This scenario, along with the estimated physical conditions, is modeled using the 3D geometry radiative transfer code MOLLIE for the SiO(J$=8-7$) molecular line. The main features of the outflow and the expanding shell are reproduced by the model.

arXiv comment19 pages, 17 figures, 2 appendices. Accepted for publication by The Astrophysical Journal

References in corpus (42)

• Star Formation in the Milky Way and Nearby Galaxies
• A computer program for fast non-LTE analysis of interstellar line spectra
• Toward Understanding Massive Star Formation
• The Formation of Massive Stars from Turbulent Cores
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Competitive accretion in embedded stellar cluster
• Physical Conditions in Regions of Star Formation
• High-Mass Proto-Stellar Candidates - II : Density structure from dust continuum and CS emission
• Massive star formation: Nurture, not nature
• Massive Stars: Their Environment and Formation
• Structure and Evolution of the Envelopes of Deeply Embedded Massive Young Stars
• Dense Gas and Star Formation: Characteristics of Cloud Cores Associated with Water Masers
• SiO line emission from C-type shock waves : interstellar jets and outflows
• A CS J=5-4 Mapping Survey Towards High-mass Star Forming Cores Associated with Water Masers
• Resetting chemical clocks of hot cores based on S-bearing molecules
• A line confusion limited millimeter survey of Orion KL (I): sulfur carbon chains
• Envelope Emission in Young Stellar Systems: A Sub-Arcsecond Survey of Circumstellar Structure
• The HCO+ emission excess in bipolar outflows
• A line confusion limited millimeter survey of Orion KL. II: Silicon-bearing species
• An analytic column density profile to fit prestellar cores
• A line confusion-limited millimeter survey of Orion KL. III. Sulfur oxide species
• Giant molecular clouds and massive star formation in the southern milky way
• Calibration of evolutionary diagnostics in high-mass star formation
• Molecular outflows towards O-type young stellar objects
• Subarcsecond Submillimeter Imaging of the Ultracompact HII Region G5.89-0.39
• A ring/disk/outflow system associated with W51 North: a very massive star in the making
• Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution
• The structure of molecular clumps around high-mass young stellar objects
• Arcsecond Scale Kinematic and Chemical Complexity in Cepheus A-East
• Radiation Transfer of Models of Massive Star Formation. II. Effects of the Outflow
• Evidence of a SiO collimated outflow from a massive YSO in IRAS 17233-3606
• A multiwavelength study of young massive star forming regions: II. The dust environment
• The Possibly Remnant Massive Outflow in G5.89-0.39: I - Observations and Initial MHD Simulations
• SiO excitation from dense shocks in the earliest stages of massive star formation
• Multi-generation massive star-formation in NGC3576
• Physical and chemical differentiation of the luminous star-forming region W49A - Results from the JCMT Spectral Legacy Survey
• Physical characteristics of G331.5-0.1: The luminous central region of a Giant Molecular Cloud
• Arcsecond resolution mapping of Sulfur Dioxide emission in the circumstellar envelope of VY Canis Majoris
• ALMA observations of the massive molecular outflow G331.512-0.103
• G345.45+1.50: An expanding ring-like structure with massive star formation
• Four highly luminous massive star forming regions in the Norma Spiral Arm.: I. Molecular gas and dust observations
• Challenging shock models with SOFIA OH observations in the high-mass star-forming region Cepheus A

Cited by in corpus (12)

• The ALMA Survey of 70 $\mu \mathrm{m}$ Dark High-mass Clumps in Early Stages (ASHES). II: Molecular Outflows in the Extreme Early Stages of Protocluster Formation
• The SEDIGISM survey: a search for molecular outflows
• Dense Cores, Filaments and Outflows in the S255IR Region of High Mass Star Formation
• Isocyanic acid (HNCO) in the Hot Molecular Core G331.512-0.103: Observations and Chemical Modelling
• Cyanoacetylene in the outflow/hot molecular core G331.512-0.103
• Radiative transfer modeling of the observed line profiles in G31.41+0.31
• A spectral survey of CH3CCH in the Hot Molecular Core G331.512-0.103
• Multiple molecular outflows and fragmentation in the IRDC core G34.43+00.24 MM1
• Observations and chemical modeling of the isotopologues of formaldehyde and the cations of formyl and protonated formaldehyde in the hot molecular core G331.512-0.103
• Looking for evidence of high-mass star formation at core scale in a massive molecular clump
• Unmasking the physical information inherent to interstellar spectral line profiles with Machine Learning. I. Application of LTE to HCN and HNC transitions
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- X. Chemical differentiation among the massive cores in G9.62+0.19