Temperature structure and kinematics of the IRDC G035.39-00.33

Abstract

Aims. Infrared dark clouds represent the earliest stages of high-mass star formation. Detailed observations of their physical conditions on all physical scales are required to improve our understanding of their role in fueling star formation. Methods. We investigate the large-scale structure of the IRDC G035.39-00.33, probing the dense gas with the classical ammonia thermometer. This allows us to put reliable constraints on the temperature of the extended, pc-scale dense gas reservoir and to probe the magnitude of its non-thermal motions. Available far-infrared observations can be used in tandem with the observed ammonia emission to estimate the total gas mass contained in G035.39-00.33. Results. We identify a main velocity component as a prominent filament, manifested as an ammonia emission intensity ridge spanning more than 6 pc, consistent with the previous studies on the Northern part of the cloud. A number of additional line-of-sight components are found, and a large scale, linear velocity gradient of ~0.2 km s${}^{-1}$ pc${}^{-1}$ is found along the ridge of the IRDC. In contrast to the dust temperature map, an ammonia-derived kinetic temperature map, presented for the entirety of the cloud, reveals local temperature enhancements towards the massive protostellar cores. We show that without properly accounting for the line of sight contamination, the dust temperature is 2-3 K larger than the gas temperature measured with NH${}_3$. Conclusions. While both the large scale kinematics and temperature structure are consistent with that of starless dark filaments, the kinetic gas temperature profile on smaller scales is suggestive of tracing the heating mechanism coincident with the locations of massive protostellar cores.

arXiv comment11 pages, 10 figures, accepted to A&A

References in corpus (67)

• Astropy: A Community Python Package for Astronomy
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• Theory of Star Formation
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Infrared Emission from Interstellar Dust. IV. The Silicate-Graphite-PAH Model in the Post-Spitzer Era
• From filamentary clouds to prestellar cores to the stellar IMF: Initial highlights from the Herschel Gould Belt survey
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Hi-GAL: the Herschel infrared Galactic Plane Survey
• Systematic Molecular Differentiation in Starless Cores
• Infrared Dark Clouds: precursors to star clusters
• Cores, filaments, and bundles: hierarchical core formation in the L1495/B213 Taurus region
• How to Calculate Molecular Column Density
• Tracing the Mass during Low-Mass Star Formation. II. Modelling the Submillimeter Emission from Pre-Protostellar Cores
• Helical Fields and Filamentary Molecular Clouds
• Observing the gas temperature drop in the high-density nucleus of L 1544
• Ammonia in Infrared Dark Clouds
• Hi-GAL, the Herschel infrared Galactic Plane Survey: photometric maps and compact source catalogues. First data release for Inner Milky Way: +68°> l > -70°
• Hierarchical fragmentation and differential star formation in the Galactic "Snake": infrared dark cloud G11.11-0.12
• Planck Early Results: Thermal dust in Nearby Molecular Clouds
• An Ammonia Spectral Atlas of Dense Cores in Perseus
• Chemistry in Infrared Dark Cloud Clumps: a Molecular Line Survey at 3 mm
• Herschel-Planck dust optical-depth and column-density maps: I. Method description and results for Orion
• Direct observation of a sharp transition to coherence in Dense Cores
• Dense core formation by fragmentation of velocity-coherent filaments in L1517
• Fragmentation of Molecular Clumps and Formation of Protocluster
• Mid-Infrared Extinction Mapping of Infrared Dark Clouds II. The Structure of Massive Starless Cores and Clumps
• Characterizing Precursors to Stellar Clusters with Herschel
• The Dynamics of Massive Starless Cores with ALMA
• Chains of dense cores in the Taurus L1495/B213 complex
• The Green Bank Ammonia Survey (GAS): First Results of NH3 mapping the Gould Belt
• High-dynamic-range extinction mapping of infrared dark clouds: Dependence of density variance with sonic Mach number in molecular clouds
• Hierarchical Fragmentation and Jet-like Outflows in IRDC G28.34+0.06, a Growing Massive Protostar Cluster
• Large-scale filaments associated with Milky Way spiral arms
• The dynamical properties of dense filaments in the infrared dark cloud G035.39-00.33
• Parsec-scale SiO Emission in an Infrared Dark Cloud
• The data reduction pipeline for the Hi-GAL survey
• Mid-Infrared Extinction Mapping of Infrared Dark Clouds: Probing the Initial Conditions for Massive Stars and Star Clusters
• Dust SEDs in the era of Herschel and Planck: a Hierarchical Bayesian fitting technique
• The Initial Conditions of Clustered Star Formation I: NH3 Observations of Dense Cores in Ophiuchus
• The first Hi-GAL observations of the outer Galaxy: a look to star formation in the third Galactic quadrant in the longitude range 216.5 < l < 225.5
• The Herschel view of massive star formation in G035.39--00.33: Dense and cold filament of W48 undergoing a mini-starburst
• Mapping Large-Scale CO Depletion in a Filamentary Infrared Dark Cloud
• Complex, Quiescent Kinematics in a Highly Filamentary Infrared Dark Cloud
• Dense Cores in Perseus: The Influence of Stellar Content and Cluster Environment
• Understanding star formation in molecular clouds II. Signatures of gravitational collapse of IRDCs
• Very Large Array Observations of Ammonia in Infrared-Dark Clouds I: Column Density and Temperature Structure
• Dust-temperature of an isolated star-forming cloud: Herschel observations of the Bok globule CB244
• A Census of Large-Scale ($\ge$ 10 pc), Velocity-Coherent, Dense Filaments in the Northern Galactic Plane: Automated Identification Using Minimum Spanning Tree
• EVLA Observations of the Barnard 5 Star-Forming Core: Embedded Filaments Revealed
• Investigating the structure and fragmentation of a highly filamentary IRDC
• Protostellar Outflow Heating in a Growing Massive Protocluster
• Unveiling the Early-Stage Anatomy of a Protocluster Hub with ALMA
• Gas Kinematics and Excitation in the Filamentary IRDC G035.39-00.33
• Characterization of Infrared Dark Clouds -- NH${}_3$ Observations of an Absorption-contrast Selected IRDC Sample
• Very Large Array Observations of Ammonia in Infrared-Dark Clouds II: Internal Kinematics
• A Pre-Protostellar Core in L1551
• The fragmentation and stability of hierarchical structure in Serpens South
• A Virialized Filamentary Infrared Dark Cloud
• Widespread deuteration across the IRDC G035.39-00.33
• The Dynamical State of Filamentary Infrared Dark Clouds
• The Giant Molecular Cloud Environments of Infrared Dark Clouds
• The Distribution of Mass Surface Densities in a High-Mass Protocluster
• Oscillating Filaments: I - Oscillation and Geometrical Fragmentation
• Some like it cold: molecular emission and effective dust temperatures of dense cores in the Pipe Nebula
• Far-infrared extinction mapping of infrared dark clouds
• Spectroscopic infrared extinction mapping as a probe of grain growth in IRDCs

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