Interaction between the Supernova Remnant W44 and the Infrared Dark Cloud G034.77-00.55: shock induced star formation?

Abstract

How Supernova Remnant (SNR) shocks impact nearby molecular clouds is still poorly observationally constrained. It is unclear if SNRs can positively or negatively affect clouds star formation potential. We have studied the dense gas morphology and kinematics toward the Infrared Dark Cloud (IRDC) G034.77-00.55, shock-interacting with the SNR W44, to identify evidence of early stage star formation induced by the shock. We have used high-angular resolution N2H+(1-0) images across G034.77-00.55, obtained with ALMA. N2H+ is a well known tracer of dense and cold material, optimal to identify gas with the highest potential to harbour star formation. The N2H+ emission is distributed into two elongated structures, one toward the dense ridge at the edge of the source and one toward the inner cloud. Both elongations are spatially associated with well-defined mass-surface density features. The velocities of the gas in the two structures i.e., 38-41 km s-1 and 41-43 km s-1 are consistent with the lowest velocities of the J- and C-type parts of the SNR-driven shock, respectively. A third velocity component is present at 43-45.5 km s-1. The dense gas shows a fragmented morphology with core-like fragments of scales consistent with the Jeans lengths, masses $\sim$1-20 M${}_{\odot }$, densities (n(H${}_2$)$\ge$10${}^5$ cm${}^{-3}$) sufficient to host star formation in free-fall time scales (few 10${}^4$ yr) and with virial parameters that hint toward possible collapse. The W44 driven shock may have swept up the encountered material which is now seen as a dense ridge, almost detached from the main cloud, and an elongation within the inner cloud, well constrained in both N2H+ emission and mass surface density. This shock compressed material may have then fragmented into cores that are either in a starless or pre-stellar stage. Additional observations are needed to confirm this scenario and the nature of the cores.

arXiv comment12 pages, 8 figures, accepted for publication in A&A

References in corpus (75)

• Dense Cores in Dark Clouds. XIV. N2H+(1-0) maps of dense cloud cores
• Structural Analysis of Molecular Clouds: Dendrograms
• A Universal, Local Star Formation Law in Galactic Clouds, Nearby Galaxies, High-Redshift Disks, and Starbursts
• Infrared Dark Clouds: precursors to star clusters
• Probing the evolutionary status of starless cores through N2H+ and N2D+ observations
• Global collapse of molecular clouds as a formation mechanism for the most massive stars
• A Minimum Column Density of 1 g cm^-2 for Massive Star Formation
• The role of stellar feedback in the formation of galaxies
• Low Virial Parameters in Molecular Clouds: Implications for High Mass Star Formation and Magnetic Fields
• Ammonia in Infrared Dark Clouds
• A Spitzer Space Telescope Infrared Survey of Supernova Remnants in the Inner Galaxy
• The Formation and Destruction of Molecular Clouds and Galactic Star Formation
• Global Star Formation Rates in Disk Galaxies and Circumnuclear Starbursts from Cloud Collisions
• Magnetic Fields in High-Mass Infrared Dark Clouds
• Mid-Infrared Extinction Mapping of Infrared Dark Clouds II. The Structure of Massive Starless Cores and Clumps
• Probing the initial conditions of high-mass star formation. II. Fragmentation, stability, and chemistry
• Survey of ortho-H2D+(1_{1,0}-1_{1,1}) in dense cloud cores
• High-dynamic-range extinction mapping of infrared dark clouds: Dependence of density variance with sonic Mach number in molecular clouds
• The N2D+/N2H+ ratio as an evolutionary tracer of Class 0 protostars
• The Mass-Size Relation from Clouds to Cores. II. Solar Neighborhood Clouds
• Shocked Molecular Gas in the Supernova Remnants W 28 and W 44: Near-infrared and millimeter-wave observations
• Mid-Infrared Extinction Mapping of Infrared Dark Clouds: Probing the Initial Conditions for Massive Stars and Star Clusters
• Spectral Line Identification and Modelling (SLIM) in the MAdrid Data CUBe Analysis (MADCUBA) package: An interactive software for data cube analysis
• Deuteration as an evolutionary tracer in massive-star formation
• N2H+(1-0) survey of massive molecular cloud cores
• The impact of shocks on the chemistry of molecular clouds: high resolution images of chemical differentiation along the NGC1333-IRAS2A outflow
• The dangers of being trigger--happy
• The modelling of feedback in star formation simulations
• 'The Brick' is not a brick: A comprehensive study of the structure and dynamics of the Central Molecular Zone cloud G0.253+0.016
• Interstellar Deuterium, Nitrogen, and Oxygen Abundances Toward GD 246, WD 2331$-$475, HZ 21, and Lan 23: Results from the FUSE Mission
• Searching for massive pre--stellar cores through observations of N2H+ and N2D+
• Deuteration and evolution in the massive star formation process: the role of surface chemistry
• The low frequency radio emission and spectrum of the extended SNR W44: new VLA observations at 74 and 324 MHz
• Seeding the Galactic Centre gas stream: gravitational instabilities set the initial conditions for the formation of protocluster clouds
• A First Look at BISTRO Observations of The $\rho$ Oph-A core
• A large catalogue of molecular clouds with accurate distances within 4 kpc of the Galactic disk
• Unveiling the Early-Stage Anatomy of a Protocluster Hub with ALMA
• Grain Evolution across the Shocks in the L1448-mm Outflow
• Properties of dense cores in clustered massive star-forming regions at high angular resolution
• ALMA resolves the hourglass magnetic field in G31.41+0.31
• The Deuterium Fraction in Massive Starless Cores and Dynamical Implications
• The Core Mass Function Across Galactic Environments. II. Infrared Dark Cloud Clumps
• The Supernova Remnant W44: confirmations and challenges for cosmic-ray acceleration
• A Hunt for Massive Starless Cores
• The Core Mass Function in the Massive Protocluster G286.21+0.17 revealed by ALMA
• When the tale comes true: multiple populations and wide binaries in the Orion Nebula Cluster
• Magnetic fields in the infrared dark cloud G34.43+0.24
• The Initial Conditions of Stellar Protocluster Formation: III. The Herschel counterparts of the Spitzer Dark Cloud catalogue
• Super Hot Cores in NGC 253: Witnessing the formation and early evolution of Super Star Clusters
• N2H+ Observations of Molecular Cloud Cores in Taurus
• Kinematics of Shocked Molecular Gas Adjacent to the Supernova Remnant W44
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). IV. Star formation signatures in G023.477
• The OH (1720 MHz) Supernova Remnant Masers in W44: MERLIN and VLBA Polarization Observations
• ALMA-IRDC: Dense gas mass distribution from cloud to core scales
• The Giant Molecular Cloud Environments of Infrared Dark Clouds
• Widespread deuteration across the IRDC G035.39-00.33
• Interstellar Plunging Waves: ALMA resolves the physical structure of non-stationary MHD shocks
• Mother of Dragons: A Massive, quiescent core in the dragon cloud (IRDC G028.37+00.07)
• Deuterium Fractionation in the Ophiuchus Molecular Cloud
• Radiative Supernova Remnants and Supernova Feedback
• Negative and Positive Feedback from a Supernova Remnant with SHREC: A detailed Study of the Shocked Gas in IC443
• High-resolution Near-infrared Spectroscopic Study of Galactic Supernova Remnants. I. Kinematic Distances
• ALMA reveals the magnetic field evolution in the high-mass star forming complex G9.62+0.19
• An analysis of the deuterium fractionation of star-forming cores in the Perseus molecular cloud
• ALMA CO Observations of the Gamma-Ray Supernova Remnant RX J1713.7-3946: Discovery of Shocked Molecular Cloudlets and Filaments at 0.01 pc scales
• Deuterium chemistry of dense gas in the vicinity of low-mass and massive star forming regions
• A molecular outflow evidencing star formation activity in the vicinity of the HII region G034.8-0.7 and the SNR W44
• The Core Mass Function Across Galactic Environments. III. Massive Protoclusters
• C2H N=1-0 and N2H+ J=1-0 observations of Planck Galactic cold clumps
• Dynamics, CO depletion, and deuterium fractionation of the dense condensations within the fragmented prestellar core Orion B9-SMM 6
• Infrared Dark Clouds and high-mass star formation activity in Galactic Molecular Clouds
• Deuterium Fractionation across the Infrared Dark Cloud G034.77-00.55 interacting with the Supernova Remnant W44
• ALMA-IRDC II. First high-angular resolution measurements of the 14N/15N ratio in a large sample of infrared-dark cloud cores
• Star Formation in a Strongly Magnetized Cloud
• Playing with FIRE: A Galactic Feedback-Halting Experiment Challenges Star Formation Rate Theories

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