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The formation of the open cluster NGC 602 in the Small Magellanic Cloud triggered by colliding HI flows
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abstract
NGC 602 is an outstanding young open cluster in the Small Magellanic Cloud. We have analyzed the new HI data taken with the Galactic Australian Square Kilometre Array Pathfinder survey project at an angular resolution of 30". The results show that there are three velocity components in the NGC 602 region. We found that two of them having ~20 km s$^{-1}$ velocity separation show complementary spatial distribution with a displacement of 147 pc. We present a scenario that the two clouds collided with each other and triggered the formation of NGC 602 and eleven O stars. The average time scale of the collision is estimated to be ~8 Myr, while the collision may have continued over a few Myr. The red shifted HI cloud extending ~500 pc flows possibly to the Magellanic Bridge, which was driven by the close encounter with the Large Magellanic Cloud 200 Myr ago (Fujimoto & Noguchi 1990; Muller & Bekki 2007). Along with the RMC136 and LHA 120-N 44 regions the present results lend support for that the galaxy interaction played a role in forming high-mass stars and clusters.
Forward citations
Cited by 3 Pith papers
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MIGHTEE-HI: Environmental effects of cosmic filaments on extragalactic HI detections in the COSMOS and XMM-LSS fields
Filaments in the cosmic web measurably change how often galaxies are detected in HI, reducing detections in low-density late-type galaxies and enhancing them in massive early-type galaxies.
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Detection of a Deeply Embedded Protocluster Candidate in NGC 602 with JWST
JWST observations reveal MZS-1, an extended 100-140 K mid-infrared source in NGC 602, interpreted as a deeply embedded protocluster of at least six low-mass Stage I protostars.
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ALMA 0.1 pc View of Molecular Clouds Associated with High-Mass Protostellar Systems in the Small Magellanic Cloud: Are Low-Metallicity Clouds Filamentary or Not?
About 60% of high-mass protostellar clouds in the low-metallicity Small Magellanic Cloud are filamentary at 0.1 pc scale; filaments are hotter, less turbulent, and more often associated with outflows than diffuse clouds.
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