From Massive Protostars to a Giant HII Region: Submillimeter Imaging of the Galactic Mini-starburst W43

Abstract

We have carried out a submillimeter continuum and spectroscopic study of the W43 main complex, a massive star-forming region, which harbors a giant HII region. The maps reveal a filamentary structure containing ~50 fragments with masses of 40-4000 Msun and typical diameters of 0.25 pc. Their large sizes, large non-thermal velocities (Dv ~ 5 km/s), and high densities (n_H2 ~ 10^6 cm^-3) suggest that they are protoclusters and excellent sites to form massive stars. Follow-up observations are necessary, but we have already identified three protoclusters to be very good candidates for containing very young massive protostars. The starburst cluster, that excites the giant HII region has a large impact on the molecular complex. However, it remains unclear if this first episode of star formation is triggering the formation of new massive stars, through ionization shocks crossing the closeby molecular clouds. W43 is thus an ideal laboratory to investigate massive star formation from the protostellar phase to that of giant HII regions. Moreover, the very active star-forming complex W43 may be considered a Galactic mini-starburst region that could be used as a miniature model of starburst galaxies.

20 pages, 13 figures, to be published in Astrophysical Journal

Cited by in corpus (141)

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• The initial conditions of star formation in the Ophiuchus main cloud: Kinematics of the protocluster condensations
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• High Mass Star Formation I: The Mass Distribution of Submillimeter Clumps in NGC 7538
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• Herschel Observations of the W43 "mini-starburst"
• The Giant Molecular Cloud associated with RCW 106 -- A 1.2 mm continuum mapping study
• Detection of Structure in Infrared-Dark Clouds with Spitzer: Characterizing Star Formation in the Molecular Ring
• Star formation towards the Scutum tangent region and the effects of Galactic environment
• The formation of the W43 complex: constraining its atomic-to-molecular transition and searching for colliding clouds
• The W43-MM1 mini-starburst ridge, a test for star formation efficiency models
• THOR - The HI, OH, Recombination Line Survey of the Milky Way - The pilot study: HI observations of the giant molecular cloud W43
• QUIJOTE Scientific Results. II. Polarisation Measurements of the Microwave Emission in the Galactic molecular complexes W43 and W47 and supernova remnant W44
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• The massive protostar W43-MM1 as seen by Herschel-HIFI water spectra: high turbulence and accretion luminosity
• Terahertz ammonia absorption as a probe of infall in high-mass star forming clumps
• FEEDBACK: a SOFIA Legacy Program to Study Stellar Feedback in Regions of Massive Star Formation
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• Kinematic structure of massive star-forming regions - I. Accretion along filaments
• Tracing extended low-velocity shocks through SiO emission - Case study of the W43-MM1 ridge
• The Ophiuchus Superbubble: A Gigantic Eruption from the Inner Disk of the Milky Way
• The JCMT Plane Survey: First complete data release - emission maps and compact source catalogue
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• Cloud Structure of Galactic OB Cluster Forming Regions from Combining Ground and Space Based Bolometric Observations
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• The ATLASGAL survey: The sample of young massive cluster progenitors
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• Massive Clumps in the NGC 6334 Star Forming Region
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• ATLASGAL-selected massive clumps in the inner Galaxy IV. Millimeter hydrogen recombination lines from associated HII regions
• Molecules in G1.6-0.025 - 'Hot' Chemistry in the Absence of Star Formation at the Periphery of the Galactic Center Region
• Kinetic temperature of massive star forming molecular clumps measured with formaldehyde. II. The Large Magellanic Cloud
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• FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope (FUGIN). VI. Dense gas and mini-starbursts in the W43 giant molecular cloud complex
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• EVN observations of 6.7 GHz methanol maser polarization in massive star-forming regions. V. Completion of the flux-limited sample
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