{"paper":{"title":"Cluster Formation Triggered by Filament Collisions in Serpens South","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Daisuke Iono, Fumitaka Nakamura, Hideo Ogawa, Hiroko Shinnaga, Hiroyuki Maezawa, Hiroyuki Nishitani, Izumi Mizuno, Kazuhito Dobashi, Kazuki Tokuda, Kimihiko Kimura, Koji Sugitani, Minato Kozu, Munetake Momose, Nario Kuno, Nozomi Okada, Ryohei Kawabe, Satoshi Yamamoto, Seiji Kameno, Shuro Takano, Taku Nakajima, Tomohiro Tanaka, Tomomi Shimoikura, Tomoya Hirota, Toshikazu Onishi, Yoshinori Yonekura, Yoshito Shimajiri, Yutaka Hasegawa","submitted_at":"2014-07-04T13:55:05Z","abstract_excerpt":"The Serpens South infrared dark cloud consists of several filamentary ridges, some of which fragment into dense clumps. On the basis of CCS ($J_N=4_3-3_2$), HC$_3$N ($J=5-4$), N$_2$H$^+$ ($J=1-0$), and SiO ($J=2-1, v=0$) observations, we investigated the kinematics and chemical evolution of these filamentary ridges. We find that CCS is extremely abundant along the main filament in the protocluster clump. We emphasize that Serpens South is the first cluster-forming region where extremely-strong CCS emission is detected. The CCS-to-N$_2$H$^+$ abundance ratio is estimated to be about 0.5 toward t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.1235","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}