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Paper: Cluster Formation Triggered by Filament Collisions in Serpens South
Volume: 499, Revolution in Astronomy with ALMA: The Third Year
Page: 239
Authors: Nakamura, F.; Tanaka, T.; Awazu, Y.; Shimajiri, Y.; Sugitani, K.; Kawabe, R.; Nishitani, H.; Dobashi, K.; Shimoikura, T.; Yonekura, Y.; Mizuno, I.; Kimura, K.; Tokuda, K.; Kozu, M.; Okada, N.; Hasegawa, Y.; Ogawa, H.; Kameno, S.; Shinnaga, H.; Momose, M.; Nakajima, T.; Onishi, T.; Maezawa, H.; Hirota, T.; Takano, S.; Iono, D.; Kuno, N.; Yamamoto, S.
Abstract: Serpens South is a nearby infrared dark cloud (IRDC), consisting of several filamentary ridges, some of which fragment into dense clumps. On the basis of CCS (JN=43–32) observations, we investigated the kinematics and chemical evolution of these filamentary ridges. We find that CCS is extremely abundant along the main filament. We emphasize that Serpens South IRDC is the first cluster-forming region with extremely-strong CCS emission. We identify 6 ridges from the Herschel column density map. These ridges appear to converge toward the protocluster clump, suggesting that the collisions of these ridges may have triggered cluster formation. The collisions presumably happened within the last few × 105 yr because the chemical evolution calculation indicates that CCS is abundant only in the first few × 105 yr.
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