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A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar
文献类型：期刊论文
| 作者 | Burns, R. A.20,21; Sugiyama, K.19,21; Hirota, T.21; Kim, Kee-Tae18,20; Sobolev, A. M.17; Stecklum, B.16; MacLeod, G. C.14,15; Yonekura, Y.13; Olech, M.12; Orosz, G.10,11
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| 刊名 | NATURE ASTRONOMY
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| 出版日期 | 2020-01-13 |
| 页码 | 5 |
| ISSN号 | 2397-3366 |
| DOI | 10.1038/s41550-019-0989-3 |
| 产权排序 | 12 |
| 英文摘要 | A ring of maser emission seemingly expanding at 0.05 c is actually tracing the propagation of heat through the circumstellar medium around a high-mass protostar rather than subluminal motion. The heatwave is a manifestation of an accretion burst. High-mass stars are thought to accumulate much of their mass via short, infrequent bursts of disk-aided accretion(1,2). Such accretion events are rare and difficult to observe directly but are known to drive enhanced maser emission(3-6). In this Letter we report high-resolution, multi-epoch methanol maser observations toward G358.93-0.03, which reveal an interesting phenomenon: the subluminal propagation of a thermal radiation 'heatwave' emanating from an accreting high-mass protostar. The extreme transformation of the maser emission implies a sudden intensification of thermal infrared radiation from within the inner (40-mas, 270-au) region. Subsequently, methanol masers trace the radial passage of thermal radiation through the environment at >= 4% of the speed of light. Such a high translocation rate contrasts with the <= 10 km s(-1) physical gas motions of methanol masers typically observed using very-long-baseline interferometry (VLBI). The observed scenario can readily be attributed to an accretion event in the high-mass protostar G358.93-0.03-MM1. While being the third case in its class, G358.93-0.03-MM1 exhibits unique attributes hinting at a possible 'zoo' of accretion burst types. These results promote the advantages of maser observations in understanding high-mass-star formation, both through single-dish maser monitoring campaigns and via their international cooperation as VLBI arrays. |
| WOS关键词 | METHANOL MASERS |
| 资助项目 | EACOA Fellowship from the East Asian Core Observatories Association ; ARC[DP180101061] ; CAS LCWR grant[2018-XBQNXZ-B-021] ; Foundation for the Advancement of Theoretical Physics and Mathematics BASIS ; JSPS KAKENHI[JP19K03921] ; MEXT/JSPS KAKENHI[16K05293] ; MEXT/JSPS KAKENHI[17K05398] ; Italian Ministry of Foreign Affairs and International Cooperation (MAECI)[ZA18GR02] ; South African Department of Science and Technology's National Research Foundation (DST-NRF) as part of the ISARP RADIOSKY2020 Joint Research Scheme[113121] ; National Science Centre, Poland[2016/21/B/ST9/01455] ; Australian Government ; Government of Western Australia |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | NATURE PUBLISHING GROUP |
| WOS记录号 | WOS:000508167700002 |
| 资助机构 | EACOA Fellowship from the East Asian Core Observatories Association ; ARC ; CAS LCWR grant ; Foundation for the Advancement of Theoretical Physics and Mathematics BASIS ; JSPS KAKENHI ; MEXT/JSPS KAKENHI ; Italian Ministry of Foreign Affairs and International Cooperation (MAECI) ; South African Department of Science and Technology's National Research Foundation (DST-NRF) as part of the ISARP RADIOSKY2020 Joint Research Scheme ; National Science Centre, Poland ; Australian Government ; Government of Western Australia |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/3318]  |
| 专题 | 射电天文研究室_VLBI天体物理与技术应用研究团组 |
| 通讯作者 | Burns, R. A. |
| 作者单位 | 1.Max Planck Inst Radioastron, Bonn, Germany 2.Netherlands Inst Radio Astron, Dwingeloo, Netherlands 3.Univ Nigeria, Fac Phys Sci, Dept Phys & Astron, Nsukka, Nigeria 4.North West Univ, Phys Dept, Space Res Unit, Potchefstroom, South Africa 5.INAF Osservatorio Astron Cagliari, Selargius, Italy 6.Max Planck Inst Astron, Heidelberg, Germany 7.CSIRO, Australia Telescope Natl Facil, Epping, NSW, Australia 8.NRAO, Charlottesville, VA USA 9.Dublin Inst Adv Studies, Astron & Astrophys Sect, Dublin, Ireland 10.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Xinjiang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Burns, R. A.,Sugiyama, K.,Hirota, T.,et al. A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar[J]. NATURE ASTRONOMY,2020:5. |
| APA | Burns, R. A..,Sugiyama, K..,Hirota, T..,Kim, Kee-Tae.,Sobolev, A. M..,...&Kramer, B..(2020).A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar.NATURE ASTRONOMY,5. |
| MLA | Burns, R. A.,et al."A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar".NATURE ASTRONOMY (2020):5. |
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