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タイトル: | The Impact of Feedback in Massive Star Formation. II. Lower Star Formation Efficiency at Lower Metallicity |
著者: | Tanaka, Kei E. I. Tan, Jonathan C. Zhang, Yichen Hosokawa, Takashi ![]() ![]() ![]() |
著者名の別形: | 細川, 隆史 |
キーワード: | stars: evolution stars: formation stars: luminosity function, mass function stars: massive stars: winds, outflows |
発行日: | 1-Jul-2018 |
出版者: | American Astronomical Society |
誌名: | The Astrophysical Journal |
巻: | 861 |
号: | 1 |
論文番号: | 68 |
抄録: | We conduct a theoretical study of the formation of massive stars over a wide range of metallicities from 10⁻⁵ to 1 Z☉ and evaluate the star formation efficiencies (SFEs) from prestellar cloud cores taking into account multiple feedback processes. Unlike for simple spherical accretion, feedback processes in the case of disk accretion do not set upper limits on stellar masses. At solar metallicity, launching of magneto-centrifugally driven outflows is the dominant feedback process to set SFEs, while radiation pressure, which has been regarded as pivotal, makes only a minor contribution even in the formation of stars over 100 M☉. Photoevaporation becomes significant in the formation of stars over 20 M☉ at low metallicities of ≾10⁻² Z☉, where dust absorption of ionizing photons is inefficient. We conclude that if initial prestellar core properties are similar, then massive stars are rarer in extremely metal-poor environments of 10⁻⁵-10⁻³Z☉. Our results give new insight into the high-mass end of the initial mass function and its potential variation with galactic and cosmological environments. |
著作権等: | Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
URI: | http://hdl.handle.net/2433/236651 |
DOI(出版社版): | 10.3847/1538-4357/aac892 |
出現コレクション: | 学術雑誌掲載論文等 |

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