Fragmentation and Kinematics of dense molecular cores in the filamentary infrared-dark cloud G011.11-0.12

Abstract

We present new Plateau de Bure Interferometer observations of a region in the filamentary infrared-dark cloud (IRDC) G011.11-0.12 containing young, star-forming cores. In addition to the 3.2mm continuum emission from cold dust, we map this region in the N${}_2$H${}^{+}$(1-0) line to trace the core kinematics with an angular resolution of 2" and velocity resolution of 0.2km s${}^{-1}$. These data are presented in concert with recent {\em Herschel} results, single-dish N${}_2$H${}^{+}$(1-0) data, SABOCA 350$\mu$m continuum data, and maps of the C${}^{18}$O (2-1) transition obtained with the IRAM 30m telescope. We recover the star-forming cores at 3.2mm continuum, while in N${}_2$H${}^{+}$ they appear at the peaks of extended structures. The mean projected spacing between N${}_2$H${}^{+}$ emission peaks is 0.18pc, consistent with simple isothermal Jeans fragmentation. The 0.1pc-sized cores have low virial parameters on the criticality borderline, while on the scale of the whole region, we infer that it is undergoing large-scale collapse. The N${}_2$H${}^{+}$ linewidth increases with evolutionary stage, while CO isotopologues show no linewidth variation with core evolution. Centroid velocities of all tracers are in excellent agreement, except in the starless region where two N${}_2$H${}^{+}$ velocity components are detected, one of which has no counterpart in C${}^{18}$O. We suggest that gas along this line of sight may be falling into the quiescent core, giving rise to the second velocity component, possibly connected to the global collapse of the region.

arXiv commentAccepted for publication in Astronomy & Astrophysics

References in corpus (53)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Formation of Massive Stars from Turbulent Cores
• Dense Cores in Dark Clouds. XIV. N2H+(1-0) maps of dense cloud cores
• Competitive accretion in embedded stellar cluster
• Cores, filaments, and bundles: hierarchical core formation in the L1495/B213 Taurus region
• N2H+ and C18O Depletion in a Cold Dark Cloud
• Global collapse of molecular clouds as a formation mechanism for the most massive stars
• Low Virial Parameters in Molecular Clouds: Implications for High Mass Star Formation and Magnetic Fields
• Accretion-Driven Turbulence as Universal Process: Galaxies, Molecular Clouds, and Protostellar Disks
• Ammonia in Infrared Dark Clouds
• Hierarchical fragmentation and differential star formation in the Galactic "Snake": infrared dark cloud G11.11-0.12
• Accretion in stellar clusters and the IMF
• The initial conditions of star formation in the Ophiuchus main cloud: Kinematics of the protocluster condensations
• Dense core formation by fragmentation of velocity-coherent filaments in L1517
• A Herschel and APEX Census of the Reddest Sources in Orion: Searching for the Youngest Protostars
• Tracing the Mass during Low-Mass Star Formation. III. Models of the Submillimeter Dust Continuum Emission from Class 0 Protostars
• Dynamics of Dense Cores in the Perseus Molecular Cloud
• The dynamical properties of dense filaments in the infrared dark cloud G035.39-00.33
• Chemical evolution in the early phases of massive star formation. I
• The seeds of star formation in the filamentary infrared-dark cloud G011.11-0.12
• The Earliest Phases of Star Formation (EPoS): A Herschel Key Program - The precursors to high-mass stars and clusters
• Six Myths on the Virial Theorem for Interstellar Clouds
• Gas dynamics in Massive Dense Cores in Cygnus-X
• High-fidelity view of the structure and fragmentation of the high-mass, filamentary IRDC G11.11-0.12
• Identifying Primordial Substructure in NGC 2264
• Gravitational Infall onto Molecular Filaments
• Chemistry in Infrared Dark Clouds
• High mass star formation in the infrared dark cloud G11.11-0.12
• Distinct Chemical Regions in the "Prestellar" Infrared Dark Cloud (IRDC) G028.23-00.19
• Hierarchical Fragmentation of the Orion Molecular Filaments
• Convergent flows and low-velocity shocks in DR21(OH)
• Gas Kinematics and Excitation in the Filamentary IRDC G035.39-00.33
• Resolved Depletion Zones and Spatial Differentiation of N2H+ and N2D+
• The G11.11-0.12 Infrared-Dark Cloud: Anomalous Dust and a Non-Magnetic Isothermal Model
• Line Profiles of Cores within Clusters: II Signatures of Dynamical Collapse during High Mass Star Formation
• Molecular Line Observations of Infrared Dark Clouds: Seeking the Precursors to Intermediate and Massive Star Formation
• Kinematic structure of massive star-forming regions - I. Accretion along filaments
• Distribution and characteristics of Infrared Dark Clouds using genetic forward modelling
• The Kinematics of Molecular Cloud Cores in the Presence of Driven and Decaying Turbulence: Comparisons with Observations
• Very Large Array Observations of Ammonia in Infrared-Dark Clouds II: Internal Kinematics
• The Dynamics of Dense Cores in the Perseus Molecular Cloud II: The Relationship Between Dense Cores and the Cloud
• Mass reservoirs surrounding massive infrared dark clouds: A view by near-infrared dust extinction
• Fragmentation and dynamical collapse of the starless high-mass star-forming region IRDC18310-4
• Carbon in different phases ([CII], [CI], and CO) in infrared dark clouds: Cloud formation signatures and carbon gas fractions
• APEX/SABOCA observations of small-scale structure of infrared-dark clouds I. Early evolutionary stages of star-forming cores
• Multiple low-turbulence starless cores associated with intermediate- to high-mass star formation
• On the relative motions of dense cores and envelopes in star-forming molecular clouds
• High-angular resolution observations of methanol in the infrared dark cloud core G11.11-0.12P1
• Dynamics, CO depletion, and deuterium fractionation of the dense condensations within the fragmented prestellar core Orion B9-SMM 6
• The structure and kinematics of dense gas in NGC 2068

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