A heat-wave of accretion energy traced by masers in the G358-MM1 high-mass protostar
| Autor: | M. Olech, B. Stecklum, A. M. Sobolev, Ross A. Burns, Todd R. Hunter, James O. Chibueze, Willem A. Baan, B. Kramer, Gabor Orosz, G. C. MacLeod, G. Surcis, S. P. van den Heever, Yoshinori Yonekura, Tomoya Hirota, Lucas J. Hyland, Crystal L. Brogan, H. Linz, Chris Phillips, Kee-Tae Kim, J. Eislöffel, Simon Ellingsen, A. Caratti o Garatti, Koichiro Sugiyama |
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| Přispěvatelé: | ITA, USA, DEU, AUS, CAN, KOR, JPN, IRL, NGA, NLD, POL, CHN, ZAF, RUS, THA, 29697492 - Chibueze, James Okwe |
| Rok vydání: | 2023 |
| Předmět: |
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Radiation 01 natural sciences Stellar evolution law.invention Interstellar medium law 0103 physical sciences Very-long-baseline interferometry Astrophysics::Solar and Stellar Astrophysics Protostar Maser 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Physics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Accretion (astrophysics) Stars Astrophysics - Solar and Stellar Astrophysics Thermal radiation Astronomy and astrophysics Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics Event (particle physics) |
| DOI: | 10.48550/arxiv.2304.14739 |
| Popis: | High-mass stars are thought to accumulate much of their mass via short, infrequent bursts of disk-aided accretion. Such accretion events are rare and difficult to observe directly but are known to drive enhanced maser emission. In this Letter we report high-resolution, multi-epoch methanol maser observations toward G358.93-0.03 which reveal an interesting phenomenon; the sub-luminal propagation of a thermal radiation "heat-wave" emanating from an accreting high-mass proto-star. 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 $\geq$ 4-8\% the speed of light. Such a high translocation rate contrasts with the $\leq$ 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 proto-star 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. Comment: Published in Nature Astronomy in 2020 |
| Databáze: | OpenAIRE |
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