Gas Kinematics and Star Formation in the Filamentary IRDC G34.43+0.24

Abstract

We performed a multiwavelength study toward infrared dark cloud (IRDC) G34.43+0.24. New maps of 13CO $J$=1-0 and C18}O J=1-0 were obtained from the Purple Mountain Observatory (PMO) 13.7 m radio telescope. At 8 um (Spitzer - IRAC), IRDC G34.43+0.24 appears to be a dark filament extended by 18 arcmin along the north-south direction. Based on the association with the 870 um and C18O J=1-0 emission, we suggest that IRDC G34.43+0.24 should not be 18 arcmin in length, but extend by 34 arcmin. IRDC G34.43+0.24 contains some massive protostars, UC H II regions, and infrared bubbles. The spatial extend of IRDC G34.43+0.24 is about 37 pc assuming a distance of 3.7 kpc. IRDC G34.43+0.24 has a linear mass density of 1.6*10^{3} M_{sun} pc^{-1}, which is roughly consistent with its critical mass to length ratio. The turbulent motion may help stabilizing the filament against the radial collapse. Both infrared bubbles N61 and N62 show a ringlike structure at 8 um. Particularly, N61 has a double-shell structure, which has expanded into IRDC G34.43+0.24. The outer shell is traced by 8 um and 13}CO J=1-0 emission, while the inner shell is traced by 24 um and 20 cm emission. We suggest that the outer shell (9.9*10^{5} yr) is created by the expansion of H II region G34.172+0.175, while the inner shell (4.1-6.3*10^{5} yr) may be produced by the energetic stellar wind of its central massive star. From GLIMPSE I catalog, we selected some Class I sources with an age of 10^{5} yr. These Class I sources are clustered along the filamentary molecular cloud.

arXiv comment44 pages, 13 figures, accepted for publication in ApJ

References in corpus (40)

• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• ATLASGAL - The APEX Telescope Large Area Survey of the Galaxy at 870 microns
• Infrared Dark Clouds: precursors to star clusters
• Realistic Ionizing Fluxes for Young Stellar Populations from 0.05 to twice solar metallicity
• Helical Fields and Filamentary Molecular Clouds
• The initial conditions of stellar protocluster formation. I. A catalogue of Spitzer dark clouds
• The Large APEX Bolometer Camera LABOCA
• Ammonia in Infrared Dark Clouds
• The Green Bank Telescope HII Region Discovery Survey II. The Source Catalog
• The Milky Way Project First Data Release: A Bubblier Galactic Disk
• The "Nessie" Nebula: Cluster Formation in a Filamentary Infrared Dark Cloud
• IR Dust Bubbles: Probing the Detailed Structure and Young Massive Stellar Populations of Galactic HII Regions
• Large-scale filaments associated with Milky Way spiral arms
• The Bones of the Milky Way
• Massive Protostars in the Infrared Dark Cloud MSXDC G034.43+00.24
• Triggered star formation on the borders of the Galactic HII region RCW 82
• High-Mass Cloud Cores in the eta Carinae Giant Molecular Cloud
• Very Large Array Observations of Ammonia in Infrared-Dark Clouds I: Column Density and Temperature Structure
• Search for starless clumps in the ATLASGAL survey
• SMA observations of Infrared Dark Clouds: A tale of two cores
• Lyman Continuum Extinction by Dust in H {\sc ii} Regions of Galaxies
• Molecular Outflows and a Mid-Infrared Census of the Massive Star-Formation Region Associated with IRAS 18507+0121
• Annual Parallax Measurements of an Infrared Dark Cloud MSXDC G034.43+00.24 with VERA
• Molecular outflows within the filamentary infrared dark cloud G34.43+0.24
• Kinematics and Chemistry of the Hot Molecular Core in G34.26+0.15 at High Resolution
• Signatures of inflow motion in cores of massive star formation: Potential collapse candidates
• Galactic structure based on the ATLASGAL 870mum survey
• Linear relation for wind-blown bubble sizes of main-sequence OB stars in a molecular environment and implication for supernova progenitors
• 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
• Distances to Dark Clouds: Comparing Extinction Distances to Maser Parallax Distances
• Distributed Low-Mass Star Formation in the IRDC G34.43+00.24
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Hot Core and Molecular Outflows
• Discovery of a Massive Protostar near IRAS 18507+0121
• Uniform Infall toward the Cometary H II Region in the G34.26+0.15 Complex?
• Testing Triggered Star Formation in Six H II Regions
• The environment of the infrared dust bubble N65: a mutiwavelength study
• Physical properties, kinetics and mass function of 12 northern infrared dark clouds
• The environs of the ultracompact HII region G45.45+0.06

Cited by in corpus (22)

• A Census of Large-Scale ($\ge$ 10 pc), Velocity-Coherent, Dense Filaments in the Northern Galactic Plane: Automated Identification Using Minimum Spanning Tree
• Histogram of oriented gradients: a technique for the study of molecular cloud formation
• Magnetic fields in the infrared dark cloud G34.43+0.24
• The Massive Star-Forming Regions Omnibus X-Ray Catalog, Second Installment
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules
• Similar complex kinematics within two massive, filamentary infrared dark clouds
• A multi-wavelength observation and investigation of six infrared dark clouds
• Gas kinematics and star formation in the filamentary molecular cloud G47.06+0.26
• The effects of ionization feedback on star formation: A case study of the M16 H II region
• The study of a system of H II regions toward l = 24.8 deg, b = 0.1 deg at the Galactic bar - Norma arm interface
• Probing the massive star forming environment - a multiwavelength investigation of the filamentary IRDC G333.73+0.37
• Influence of Wolf-Rayet stars on surrounding star-forming molecular clouds
• The physical environment around IRAS 17599-2148: infrared dark cloud and bipolar nebula
• VLA ammonia observations of L1287: analysis of the "Guitar" core and two filaments
• Multi-line Herschel/HIFI observations of water reveal infall motions and chemical segregation around high-mass protostars
• Two-Dimensional Molecular Gas and ongoing star formation around H II region Sh2-104
• Study of the 13CO/C18O abundance ratio towards the filamentary infrared dark cloud IRDC 34.43+0.24
• New eruptive variable in the massive star-forming region associated with IRAS 18507+0121 source
• A Molecular Line Investigation of the Interaction between Mid-infrared Bubbles and the Interstellar Medium
• An X-ray View of Two Infrared Dark Clouds G034.43+00.24 and G035.39-00.33
• Excited Hydroxyl Outflow in the High-Mass Star-Forming Region G34.26+0.15
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- V. Hierarchical fragmentation and gas dynamics in IRDC G034.43+00.24