The chemical structure of young high-mass star-forming clumps: (II) parsec-scale CO depletion and deuterium fraction of $\mathrm{HC}{\mathrm{O}}^{+}$

Abstract

The physical and chemical properties of cold and dense molecular clouds are key to understanding how stars form. Using the IRAM 30 m and NRO 45 m telescopes, we carried out a Multiwavelength line-Imaging survey of the 70 $\mu$m dark and bright clOuds (MIAO). At a linear resolution of 0.1--0.5 pc, this work presents a detailed study of parsec-scale CO depletion and $\mathrm{HC}{\mathrm{O}}^{+}$ deuterium (D-) fractionation toward four sources (G11.38+0.81, G15.22-0.43, G14.49-0.13, and G34.74-0.12) included in our full sample. In each source with $\mathrm{T}<20$ K and $n_{\mathrm{H}}\sim 10^4$--$10^5\mathrm{c}{\mathrm{m}}^{-3}$, we compared pairs of neighboring 70 $\mu$m bright and dark clumps and found that (1) the ${\mathrm{H}}_2$ column density and dust temperature of each source show strong spatial anticorrelation; (2) the spatial distribution of CO isotopologue lines and dense gas tracers, such as 1--0 lines of ${\mathrm{H}}^{13}\mathrm{C}{\mathrm{O}}^{+}$ and $\mathrm{DC}{\mathrm{O}}^{+}$, are anticorrelated; (3) the abundance ratio between ${\mathrm{C}}^{18}\mathrm{O}$ and $\mathrm{DC}{\mathrm{O}}^{+}$ shows a strong correlation with the source temperature; (4) both the ${\mathrm{C}}^{18}\mathrm{O}$ depletion factor and D-fraction of $\mathrm{HC}{\mathrm{O}}^{+}$ show a robust decrease from younger clumps to more evolved clumps by a factor of more than 3; and (5) preliminary chemical modeling indicates chemical ages of our sources are $\sim 8\times 10^4$ yr, which is comparable to their free-fall timescales and smaller than their contraction timescales, indicating that our sources are likely dynamically and chemically young.

arXiv commentaccepted by ApJ

References in corpus (121)

• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Planck 2013 results. I. Overview of products and scientific results
• A computer program for fast non-LTE analysis of interstellar line spectra
• Multimodal nested sampling: an efficient and robust alternative to MCMC methods for astronomical data analysis
• An atomic and molecular database for analysis of submillimetre line observations
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• The Formation of Massive Stars from Turbulent Cores
• The UMIST database for astrochemistry 2012
• Importance Nested Sampling and the MultiNest Algorithm
• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• Clouds, filaments and protostars: the Herschel Hi-GAL Milky Way
• ATLASGAL - The APEX Telescope Large Area Survey of the Galaxy at 870 microns
• The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
• The Formation of Massive Star Systems by Accretion
• Systematic Molecular Differentiation in Starless Cores
• High-Mass Star and Massive Cluster Formation in the Milky Way
• The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers
• Infrared Dark Clouds: precursors to star clusters
• A three-phase chemical model of hot cores: the formation of glycine
• Probing the evolutionary status of starless cores through N2H+ and N2D+ observations
• Molecular ions in L1544. II. The ionization degree
• Massive star formation: Nurture, not nature
• Star formation through gravitational collapse and competitive accretion
• N2H+ and C18O Depletion in a Cold Dark Cloud
• ATLASGAL --- properties of a complete sample of Galactic clumps
• Observing the gas temperature drop in the high-density nucleus of L 1544
• Identifying the Low Luminosity Population of Embedded Protostars in the c2d Observations of Clouds and Cores
• Molecular Inventories and Chemical Evolution of Low-mass Protostellar Envelopes
• Herschel Survey of Galactic OH+, H2O+, and H3O+: Probing the Molecular Hydrogen Fraction and Cosmic-Ray Ionization Rate
• The relation between gas and dust in the Taurus Molecular Cloud
• Hierarchical fragmentation and differential star formation in the Galactic "Snake": infrared dark cloud G11.11-0.12
• How Many Infrared Dark Clouds can form Massive Stars and Clusters?
• ATLASGAL --- towards a complete sample of massive star forming clumps
• Detection of doubly-deuterated methanol in the solar-type protostar IRAS16293-2422
• Dense gas in the Galactic central molecular zone is warm and heated by turbulence
• The ATLASGAL survey: a catalog of dust condensations in the Galactic plane
• Ammonia from cold high-mass clumps discovered in the inner Galactic disk by the ATLASGAL survey
• Molecular Evolution in Collapsing Prestellar Cores III: Contraction of A Bonnor-Ebert Sphere
• An Ammonia Spectral Atlas of Dense Cores in Perseus
• Chemistry in Infrared Dark Cloud Clumps: a Molecular Line Survey at 3 mm
• Fragmentation at the Earliest Phase of Massive Star Formation
• The ALMA Survey of 70 $\mu$m dark High-mass clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation
• Fragmentation of Molecular Clumps and Formation of Protocluster
• CO Depletion and Deuterium Fractionation in Prestellar Cores
• Collapse and Fragmentation in Finite Sheets
• Molecular ions in L1544. I. Kinematics
• The Dynamics of Massive Starless Cores with ALMA
• Survey of ortho-H2D+(1_{1,0}-1_{1,1}) in dense cloud cores
• The thermal state of molecular clouds in the Galactic Center: evidence for non-photon-driven heating
• The cosmic ray ionization rate in the Galactic disk, as determined from observations of molecular ions
• From Prestellar to Protostellar Cores II. Time Dependence and Deuterium Fractionation
• How Protostellar Outflows Help Massive Stars Form
• A Massive Prestellar Clump Hosting no High-Mass Cores
• On-The-Fly Observing System of the Nobeyama 45-m and ASTE 10-m Telescopes
• The Earliest Phases of Star Formation (EPoS): A Herschel Key Program - The precursors to high-mass stars and clusters
• Far-Infrared Dust Temperatures and Column Densities of the MALT90 Molecular Clump Sample
• The molecular cloud lifecycle
• ATLASGAL-selected massive clumps in the inner Galaxy: I. CO depletion and isotopic ratios
• Filamentary Fragmentation and Accretion in High-Mass Star-Forming Molecular Clouds
• The HNC/HCN Ratio in Star-Forming Regions
• Kinematic Distances: A Monte Carlo Method
• Carbon Nitrogen, and Oxygen Galactic Gradients: A Solution to the Carbon Enrichment Problem
• Infall through the evolution of high-mass star-forming clumps
• The Bolocam Galactic Plane Survey. XIV. Physical Properties of Massive Starless and Star Forming Clumps
• Astrochemistry of Sub-Millimeter Sources in Orion: Studying the Variations of Molecular Tracers with Changing Physical Conditions
• Mapping Large-Scale CO Depletion in a Filamentary Infrared Dark Cloud
• Ortho-H2 and the Age of Interstellar Dark Clouds
• Distinct Chemical Regions in the "Prestellar" Infrared Dark Cloud (IRDC) G028.23-00.19
• Aspect Ratio Dependence of the Free-Fall Time for Non-Spherical Symmetries
• The H2O southern Galactic Plane Survey(HOPS): NH3 (1,1) and (2,2) catalogues
• Digital Spectro-Correlator System for the Atacama Compact Array of the Atacama Large Millimeter/submillimeter Array
• Water deuteration and ortho-to-para nuclear spin ratio of H2 in molecular clouds formed via the accumulation of HI gas
• Infall Signatures in a Prestellar Core embedded in the High-Mass 70 $\mu$m Dark IRDC G331.372-00.116
• ATLASGAL-selected massive clumps in the inner Galaxy: V. Temperature structure and evolution
• The Deuterium Fractionation Timescale in Dense Cloud Cores: A Parameter Space Exploration
• Galactocentric variation of the gas-to-dust ratio and its relation with metallicity
• Revisiting the radial abundance gradients of nitrogen and oxygen of the Milky Way
• Massive Quiescent Cores in Orion: Dynamical State Revealed by High-Resolution Ammonia Maps
• An Ordered Bipolar Outflow from a Massive Early-Stage Core
• Calibration of evolutionary diagnostics in high-mass star formation
• High sensitivity maps of molecular ions in L1544: I. Deuteration of N2H+ and HCO+ and first evidence of N2D+ depletion
• Protostellar Outflow Heating in a Growing Massive Protocluster
• High CO depletion in southern infrared-dark clouds
• Gas Kinematics and Excitation in the Filamentary IRDC G035.39-00.33
• The Bolocam Galactic Plane Survey. X. A Complete Spectroscopic Catalog of Dense Molecular Gas Observed toward 1.1 mm Dust Continuum Sources with 7.5 <= l <= 194 degrees
• Terahertz ammonia absorption as a probe of infall in high-mass star forming clumps
• Infall Motions in Massive Star-Forming Regions: Results from Years 1 & 2 of the MALT90 Survey
• Massive Quiescent Cores in Orion. I. Temperature Structure
• Modelling line emission of deuterated H_3^+ from prestellar cores
• Formation of Massive Protostellar Clusters -- Observations of Massive 70 $\mu$m Dark Molecular Clouds
• Cloud Structure of Galactic OB Cluster Forming Regions from Combining Ground and Space Based Bolometric Observations
• Initial phases of massive star formation in high infrared extinction clouds. II. Infall and onset of star formation
• Hierarchical fragmentation and collapse signatures in a high-mass starless region
• Gaseous CO Abundance---An Evolutionary Tracer for Molecular Clouds
• Cloud structure of three Galactic infrared dark star-forming regions from combining ground and space based bolometric observations
• Astrochemical Properties of Planck Cold Clumps
• On The Gas Temperature of Molecular Cloud Cores
• Deuterium Fractionation: the Ariadne's Thread from the Pre-collapse Phase to Meteorites and Comets today
• Outflow detection in a 70 $\mu$m dark high-mass core
• DNC/HNC and N2D+/N2H+ ratios in high-mass star forming cores
• High-mass Starless Clumps in the inner Galactic Plane: the Sample and Dust Properties
• NH_3(1_0-0_0) in the pre-stellar core L1544
• Deuterium Fractionation as an Evolutionary Probe in the Infrared Dark Cloud G28.34+0.06
• Are Infrared Dark Clouds Really Quiescent?
• Widespread deuteration across the IRDC G035.39-00.33
• Multiple paths of deuterium fractionation in protoplanetary disks
• Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde. III. The Orion Molecular Cloud 1
• Zooming in to Massive Star Birth
• On the size of the CO-depletion radius in the IRDC G351.77-0.51
• Beyond the pseudo-time-dependent approach: chemical models of dense core precursors
• HfS, Hyperfine Structure Fitting Tool
• The 3D structure of CO depletion in high-mass prestellar regions
• The Radio Ammonia Mid-Plane Survey (RAMPS) Pilot Survey
• The chemical structure of young high-mass star-forming clumps: (I) Deuteration
• Deuterium enhancement in H3+ in prestellar cores
• H${}_2$ ortho-to-para conversion on grains: A route to fast deuterium fractionation in dense cloud cores?
• Species-to-species rate coefficients for the ${\mathrm{H}}_3^{+}+{\mathrm{H}}_2$ reacting system
• Structure, Dynamics and Deuterium Fractionation of Massive Pre-Stellar Cores
• Chempl: a playable package for modeling interstellar chemistry
• Hyperfine Group Ratio: A Recipe for Deriving Kinetic Temperature from Ammonia Inversion Lines
• Gravitational acceleration and edge effects in molecular clouds

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• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). IX. Physical Properties and Spatial Distribution of Cores in IRDCs
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). IV. Star formation signatures in G023.477
• Identification of prestellar cores in high-mass star forming clumps via ${\mathrm{H}}_2{\mathrm{D}}^{+}$ observations with ALMA
• The ALMA Survey of 70 μm Dark High-mass Clumps in Early Stages (ASHES). VI. The core-scale CO-depletion
• The ALMA Survey of 70 $\mu \mathrm{m}$ Dark High-mass Clumps in Early Stages (ASHES). VII: Chemistry of Embedded Dense Cores
• Parsec-scale cosmic-ray ionisation rate in Orion
• The physical and chemical structure of high-mass star-forming regions. Unraveling chemical complexity with the NOEMA large program "CORE"
• 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
• Molecular deuterations in massive Starless Clump Candidates
• Toward a robust physical and chemical characterization of heterogeneous lines of sight: The case of the Horsehead nebula
• DCO${}^{+}$ and DCN 1-0 survey toward a sample of Planck cold clumps
• ArTéMiS imaging of the filamentary infrared dark clouds G1.75-0.08 and G11.36+0.80: Dust-based physical properties of the clouds and their clumps
• KAgoshima Galactic Object survey with Nobeyama 45-metre telescope by Mapping in Ammonia lines (KAGONMA): Discovery of parsec-scale CO depletion in the Canis Major star-forming region
• Linear filament and nested cluster evolution tomography (LANCET) I. Capture the evolution of dense gas in 14-parsec filament G316.8
• Dense Molecular Ring-like structure in gaseous CO depletion region G34.74-0.12
• KAgoshima Galactic Object survey with Nobeyama 45-metre telescope by Mapping in Ammonia lines (KAGONMA): Star formation feedback on dense molecular gas in the W33 complex
• CO Depletion in Infrared Dark Clouds