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http://hdl.handle.net/20.500.12386/31229
Titolo: | A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar | Autori: | Burns, R. A. Sugiyama, K. Hirota, T. Kim, Kee-Tae Sobolev, A. M. Stecklum, B. MacLeod, G. C. Yonekura, Y. Olech, M. Orosz, G. Ellingsen, S. P. Hyland, L. Caratti o Garatti, A. Brogan, C. Hunter, T. R. Phillips, C. van den Heever, S. P. Eislöffel, J. Linz, H. Surcis, Gabriele Chibueze, J. O. Baan, W. Kramer, B. |
Data pubblicazione: | 2020 | Rivista: | NATURE ASTRONOMY | Numero: | 4 | Da pagina:: | 506 | Abstract: | High-mass stars are thought to accumulate much of their mass via short, infrequent bursts of disk-aided accretion<SUP>1,2</SUP>. Such accretion events are rare and difficult to observe directly but are known to drive enhanced maser emission<SUP>3-6</SUP>. 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<SUP>-1</SUP> 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. | URI: | http://hdl.handle.net/20.500.12386/31229 | URL: | https://www.nature.com/articles/s41550-019-0989-3 | ISSN: | 2397-3366 | DOI: | 10.1038/s41550-019-0989-3 | Bibcode ADS: | 2020NatAs...4..506B | Fulltext: | open |
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