A Millimeter Methanol Maser Ring Tracing the Deceleration of the Heat Wave Powered by the Massive Protostellar Accretion Outburst in G358.93-0.03 MM1
文献类型：期刊论文
| 作者 | Hunter, T. R.8; Brogan, C. L.1,8; MacLeod, G. C.6,7; Cyganowski, C. J.5; Burns, R. A.3,4; McGuire, B. A.2,8 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2026-01-20 |
| 卷号 | 997期号:1页码:L21 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ae32f6 |
| 产权排序 | 3 |
| 英文摘要 | We present multiepoch, multiband Atacama Large Millimeter/submillimeter Array imaging of the new Class II millimeter methanol masers excited during the accretion outburst of the massive protostar G358.93-0.03 MM1. The highest angular resolution image (24 mas approximate to 160 au) reveals a nearly complete, circular ring of strong maser spots in the 217.2992 GHz (vt = 1) maser line that closely circumscribes the dust continuum emission from MM1. Weaker maser emission lies inside the eastern and southern halves of the maser ring, generally coincident with the centimeter masers excited during the outburst but avoiding the densest parts of the hot core gas traced by high excitation lines of CH3CN. Using a variety of fitting techniques on the image cubes of the two strongest maser lines, each observed over three to four epochs, we find the diameter of the ring increased by greater than or similar to 60% (from approximate to 1100 to approximate to 1800 au in the 217 GHz line) over 200 days, consistent with an average radial propagation rate of approximate to 0.01c, while the maser intensity declined exponentially. Fitting the angular extent of the millimeter masers versus time yields a power law of index 0.39 +/- 0.06, which also reproduces the observed extent of the 6.7 GHz masers in the first very long baseline interferometry epoch of R. A. Burns et al. 2020 This exponent is consistent with the prediction of radius versus time in the Taylor-von Neumann-Sedov self-similar solution for an intense spherical explosion from a point source (R proportional to t2/5). These results demonstrate the explosive nature of accretion outbursts in massive protostars and their ability to generate subluminal heat waves traceable by centimeter and millimeter masers for several months as the energy traverses the surrounding molecular material. |
| WOS关键词 | EXTRAORDINARY OUTBURST ; BURST ; TRANSITIONS ; ASTROPY ; LINES ; VARIABILITY ; PROTOSTARS ; DISCOVERY ; PACKAGE ; PROJECT |
| 资助项目 | Latvijas Zinamacr ; tnes Padome (Latvian Council of Science)[lzp-2022/1-0083] ; UKRI divided by Science and Technology Facilities Council (STFC)[ST/Y002229/1] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001661913800001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Latvijas Zinamacr ; tnes Padome (Latvian Council of Science) ; UKRI divided by Science and Technology Facilities Council (STFC) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8484]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Hunter, T. R. |
| 作者单位 | 1.Univ Virginia, Dept Astron, POB 3818, Charlottesville, VA 22904 USA 2.MIT, Dept Chem, Cambridge, MA 02139 USA 3.Ventspils Univ Appl Sci, Engn Res Inst, Ventspils Int Radio Astron Ctr, Inzenieru Iela 101, LV-3601 Ventspils, Latvia 4.RIKEN Pioneering Res Inst, 2-1 Hirosawa, Wako, Saitama 3510198, Japan 5.Univ St Andrews, Sch Phys & Astron, SUPA, North Haugh KY16 9SS, England 6.Hartebeesthoek Radio Astron Observ, POB 443, ZA-1740 Krugersdorp, South Africa 7.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 8.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA |
| 推荐引用方式 GB/T 7714 | Hunter, T. R.,Brogan, C. L.,MacLeod, G. C.,et al. A Millimeter Methanol Maser Ring Tracing the Deceleration of the Heat Wave Powered by the Massive Protostellar Accretion Outburst in G358.93-0.03 MM1[J]. ASTROPHYSICAL JOURNAL LETTERS,2026,997(1):L21. |
| APA | Hunter, T. R.,Brogan, C. L.,MacLeod, G. C.,Cyganowski, C. J.,Burns, R. A.,&McGuire, B. A..(2026).A Millimeter Methanol Maser Ring Tracing the Deceleration of the Heat Wave Powered by the Massive Protostellar Accretion Outburst in G358.93-0.03 MM1.ASTROPHYSICAL JOURNAL LETTERS,997(1),L21. |
| MLA | Hunter, T. R.,et al."A Millimeter Methanol Maser Ring Tracing the Deceleration of the Heat Wave Powered by the Massive Protostellar Accretion Outburst in G358.93-0.03 MM1".ASTROPHYSICAL JOURNAL LETTERS 997.1(2026):L21. |
入库方式： OAI收割
来源：新疆天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。