A Massive Prestellar Clump Hosting no High-Mass Cores

Abstract

The Infrared Dark Cloud (IRDC) G028.23-00.19 hosts a massive (1,500 Msun), cold (12 K), and 3.6-70 um IR dark clump (MM1) that has the potential to form high-mass stars. We observed this prestellar clump candidate with the SMA (~3.5" resolution) and JVLA (~2.1" resolution) in order to characterize the early stages of high-mass star formation and to constrain theoretical models. Dust emission at 1.3 mm wavelength reveals 5 cores with masses <15 Msun. None of the cores currently have the mass reservoir to form a high-mass star in the prestellar phase. If the MM1 clump will ultimately form high-mass stars, its embedded cores must gather a significant amount of additional mass over time. No molecular outflows are detected in the CO (2-1) and SiO (5-4) transitions, suggesting that the SMA cores are starless. By using the NH3 (1,1) line, the velocity dispersion of the gas is determined to be transonic or mildly supersonic (DeltaV_nt}/DeltaV_th ~1.1-1.8). The cores are not highly supersonic as some theories of high-mass star formation predict. The embedded cores are 4 to 7 times more massive than the clump thermal Jeans mass and the most massive core (SMA1) is 9 times less massive than the clump turbulent Jeans mass. These values indicate that neither thermal pressure nor turbulent pressure dominates the fragmentation of MM1. The low virial parameters of the cores (0.1-0.5) suggest that they are not in virial equilibrium, unless strong magnetic fields of ~1-2 mG are present. We discuss high-mass star formation scenarios in a context based on IRDC G028.23-00.19, a study case believed to represent the initial fragmentation of molecular clouds that will form high-mass stars.

20 pages, 4 figures, Accepted in ApJ

References in corpus (31)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Radiation-Hydrodynamic Simulations of Collapse and Fragmentation in Massive Protostellar Cores
• Star formation through gravitational collapse and competitive accretion
• A Minimum Column Density of 1 g cm^-2 for Massive Star Formation
• ATLASGAL --- towards a complete sample of massive star forming clumps
• Magnetic Fields and Massive Star Formation
• Fragmentation of Molecular Clumps and Formation of Protocluster
• The Fragmentation of Magnetized, Massive Star-Forming Cores with Radiative Feedback
• The dynamical properties of dense filaments in the infrared dark cloud G035.39-00.33
• Molecular Line Emission from Massive Protostellar Disks: Predictions for ALMA and the EVLA
• A Molecular Line Observation toward Massive Clumps Associated with Infrared Dark Clouds
• Submillimeter Array Observations of Magnetic Fields in G240.31+0.07: an Hourglass in a Massive Cluster-forming Core
• SMA observations of Infrared Dark Clouds: A tale of two cores
• Weak and Compact Radio Emission in Early High-Mass Star Forming Regions: I. VLA Observations
• Dense core properties in the Infrared Dark cloud G14.225-0.506 revealed by ALMA
• Investigating the structure and fragmentation of a highly filamentary IRDC
• Infall Motions in Massive Star-Forming Regions: Results from Years 1 & 2 of the MALT90 Survey
• Simultaneous low- and high-mass star formation in a massive protocluster: ALMA observations of G11.92-0.61
• G11.92-0.61-MM2: A Bonafide Massive Prestellar Core?
• Characterizing the properties of cluster precursors in the MALT90 survey
• Distributed Low-Mass Star Formation in the IRDC G34.43+00.24
• Initial Fragmentation in the Infrared Dark Cloud G28.53-0.25
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: 278 GHz Class I Methanol Masers
• Fragmentation and Kinematics of dense molecular cores in the filamentary infrared-dark cloud G011.11-0.12
• Tightening the belt: Constraining the mass and evolution in SDC335
• Tracing the Magnetic Field of IRDC G028.23$-$00.19 Using NIR Polarimetry
• ALMA Observations of the IRDC Clump G34.43+00.24 MM3: DNC/HNC Ratio
• Physical properties, kinetics and mass function of 12 northern infrared dark clouds
• Weak and Compact Radio Emission in Early Massive Star Formation Regions: An Ionized Jet Toward G11.11-0.12P1
• The physical conditions in IRDC clumps from Herschel HIFI observations of H2O

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