言語種別 英語 発行・発表の年月 2022/08 形態種別 学術雑誌 査読 査読あり 標題 W49N MCN-a: a disk accreting massive protostar embedded in an early-phase hot molecular core   W49N MCN-a: a disk accreting massive protostar embedded in an early-phase hot molecular core 執筆形態 共著 掲載誌名 Publications of the Astronomical Society of Japan 掲載区分 国外 出版社・発行元 Oxford University Press 巻・号・頁 74(4),pp.705-737 担当範囲 データの解析と論文執筆 著者・共著者 ◎Miyawaki, Ryosuke; Hayashi, Masahiko; Hasegawa, Tetsuo   ◎Miyawaki, Ryosuke; Hayashi, Masahiko; Hasegawa, Tetsuo 概要 The emissions from CH3CN and 11 molecular lines exhibit a consistent velocity gradient as a result of rotation. The magnitude of each velocity gradient is different, reflecting that each line samples a specific radial region. This allows us to derive a rotation curve as Vrot prop R^0.44+-0.11 for 2,400au < R < 14,000au, giving the dynamical mass as Mdyn = 57.0+24.5-17.1 (R [au]/3, 000)^1.88 Msun. The envelope mass independently estimated from the dustemission is 910Msun (for Tdust =180K) for R<7,800au and 32Msun (for Tdust=300K) for R<1,700 au. The dynamical mass formula agrees well with these mass estimates within an uncertainty of a factor of three in the latter. The envelope is self-gravitating and is unstable to form spiral arms and fragments, allowing rapid accretion to the inner radii with a rate of order 10^-2 Msun yr^-1, although inward motion was not detected. researchmap用URL https://doi.org/10.1093/pasj/psac030