High-mass Star Formation through Filamentary Collapse and Clump-fed Accretion in G22
| العنوان: | High-mass Star Formation through Filamentary Collapse and Clump-fed Accretion in G22 |
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| المؤلفون: | Simon Ellingsen, Jinghua Yuan, Christian Henkel, Annie Zavagno, Jin-Zeng Li, Yuefang Wu, Ke Wang, Hong-Li Liu, Zhiyuan Ren, Ya-Fang Huang, Tie Liu |
| المساهمون: | Chinese Academy of Sciences [Beijing] (CAS), Peking University [Beijing], University of Tasmania [Hobart, Australia] (UTAS), Max-Planck-Institut für Radioastronomie (MPIFR), European Southern Observatory (ESO), Korea Astronomy and Space Science Institute (KASI), Okayama University, The Chinese University of Hong Kong [Hong Kong], Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS) |
| المصدر: | The Astrophysical journal letters The Astrophysical journal letters, Bristol : IOP Publishing, 2018, 852 (1), pp.12. ⟨10.3847/1538-4357/aa9d40⟩ NASA Astrophysics Data System The Astrophysical journal letters, 2018, 852 (1), pp.12. ⟨10.3847/1538-4357/aa9d40⟩ |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | 010504 meteorology & atmospheric sciences, FOS: Physical sciences, Collapse (topology), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Submillimeter Array, Spectral line, 0103 physical sciences, Protostar, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), ComputingMilieux_MISCELLANEOUS, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Physics, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Star formation, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Accretion (astrophysics), Stars, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, [SDU]Sciences of the Universe [physics], Astrophysics of Galaxies (astro-ph.GA), High mass, Astrophysics::Earth and Planetary Astrophysics |
| الوصف: | How mass is accumulated from cloud-scale down to individual stars is a key open question in understanding high-mass star formation. Here, we present the mass accumulation process in a hub-filament cloud G22 which is composed of four supercritical filaments. Velocity gradients detected along three filaments indicate that they are collapsing with a total mass infall rate of about 440 $M_\odot$ Myr$^{-1}$, suggesting the hub mass would be doubled in six free-fall times, adding up to $ \sim2 $ Myr. A fraction of the masses in the central clumps C1 and C2 can be accounted for through large-scale filamentary collapse. Ubiquitous blue profiles in HCO$^+$ $ (3-2) $ and $^{13}$CO $ (3-2) $ spectra suggest a clump-scale collapse scenario in the most massive and densest clump C1. The estimated infall velocity and mass infall rate are 0.31 km s$^{-1}$ and $ 7.2 \times10^{-4} $ $M_\odot$ yr$^{-1}$, respectively. In clump C1, a hot molecular core (SMA1) is revealed by the SMA observations and an outflow-driving high-mass protostar is located at the center of SMA1. The mass of the protostar is estimated to be $ 11-15 $ $M_\odot$ and it is still growing with an accretion rate of $ 7\times10^{-5} $ $M_\odot$ yr$^{-1}$. The coexistent infall in filaments, clump C1, and the central hot core in G22 suggests that pre-assembled mass reservoirs (i.e., high-mass starless cores) may not be required to form high-mass stars. In the course of high-mass star formation, the central protostar, the core, and the clump can simultaneously grow in mass via core-fed/disk accretion, clump-fed accretion, and filamentary/cloud collapse. 17 pages, 16 figures 3 tables. and Accepted for publication in ApJ |
| اللغة: | English |
| تدمد: | 2041-8205 2041-8213 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e15e5f3787b2c20ef214452f4de6861cTest http://arxiv.org/abs/1711.08951Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....e15e5f3787b2c20ef214452f4de6861c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20418205 20418213 |
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