NH3 observations of the S235 star-forming region: Dense gas in inter-core bridges

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  • Ross A Burns
    Mizusawa VLBI Observatory, National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
  • Toshihiro Handa
    Amanogawa Galaxy Astronomy Research Center, Kagoshima University , 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
  • Toshihiro Omodaka
    Graduate School of Science and Engineering, Kagoshima University , 1-21-35 Kôrimoto, Kagoshima, Kagoshima 890-0065, Japan
  • Andrej M Sobolev
    Ural Federal University , 19 Mira St. 620002, Ekaterinburg, Russia
  • Maria S Kirsanova
    Ural Federal University , 19 Mira St. 620002, Ekaterinburg, Russia
  • Takumi Nagayama
    Mizusawa VLBI observatory , NAOJ 2-12, Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
  • James O Chibueze
    Space Research Unit, Physics Department, North-West University , Potchefstroom, 2520, South Africa
  • Mikito Kohno
    Department of Physics, Nagoya University , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
  • Makoto Nakano
    Faculty of Science and Technology, Oita University , 700 Dannoharu, Oita, Oita 870-1192, Japan
  • Kazuyoshi Sunada
    Mizusawa VLBI observatory , NAOJ 2-12, Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan
  • Dmitry A Ladeyschikov
    Ural Federal University , 19 Mira St. 620002, Ekaterinburg, Russia
  • 29697492 - Chibueze, James Okwe

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<jats:title>Abstract</jats:title> <jats:p>Star formation is thought to be driven by two groups of mechanisms; spontaneous collapse and triggered collapse. Triggered star formation mechanisms further diverge into cloud–cloud collision (CCC), “collect and collapse” (C&C) and shock-induced collapse of pre-existing, gravitationally stable cores, or “radiation driven implosion” (RDI). To evaluate the contributions of these mechanisms and establish whether these processes can occur together within the same star-forming region, we performed mapping observations of radio-frequency ammonia and water maser emission lines in the S235 massive star-forming region. Via spectral analyses of main, hyperfine, and multi-transitional ammonia lines we explored the distribution of temperature and column density in the dense gas in the S235 and S235AB star-forming region. The most remarkable result of the mapping observations is the discovery of high-density gas in inter-core bridges which physically link dense molecular cores that house young proto-stellar clusters. The presence of dense gas implies the potential for future star formation within the system of cores and gas bridges. Cluster formation implies collapse, and the continuous physical links, also seen in re-imaged archival CS and 13CO maps, suggest a common origin to the molecular cores housing these clusters, i.e a structure condensed from a single, larger parent cloud, brought about by the influence of a local expanding H$\,$ ii region. An ammonia absorption feature co-locating with the center of the extended H$\,$ ii region may be attributed to an older gas component left over from the period prior to formation of the H$\,$ ii region. Our observations also detail known and new sites of water maser emission, highlighting regions of active ongoing star formation.</jats:p>

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