Hyperfine structure of the methanol molecule as traced by Class I methanol masers
文献类型：期刊论文
| 作者 | Agafonova, I. I.14; Bayandina, O. S.13; Gong, Y.10,11,12; Henkel, C.9,12; Kim, Kee-Tae7,8; Kozlov, M. G.5,6; Lankhaar, B.1; Levshakov, S. A.14; Menten, K. M.12; Ubachs, W.4 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2024-08-23 |
| 卷号 | 533期号:2页码:1714-1732 |
| 关键词 | elementary particles methods: numerical techniques: spectroscopic ISM: molecules radio lines: ISM |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stae1815 |
| 产权排序 | 5 |
| 英文摘要 | We present results on simultaneous observations of Class I methanol masers at 25, 36, and 44 GHz towards 22 Galactic targets carried out with the Effelsberg 100-m telescope. The study investigates relations between the hyperfine (HF) structure of the torsion-rotation transitions in CH3OH and maser activity. By analysing the radial velocity shifts between different maser lines together with the patterns of the HF structure based on laboratory measurements and quantum-chemical calculations, we find that in any source only one specific HF transition forms the maser emission and that this transition changes from source to source. The physical conditions leading to this selective behaviour are still unclear. Using accurate laboratory rest frequencies for the 25 GHz transitions, we have refined the centre frequencies for the HF multiplets at 36, 44, and 95 GHz: f(36)=(36169.2488 +/- 0.0002(stat) +/- 0.0004(sys)) MHz. f(44)=(44069.4176 +/- 0.0002(stat )+/- 0.0004(sys)) MHz, and f(95)=(95169.4414 +/- 0.0003(stat) +/- 0.0004(sys)) MHz. Comparison with previous observations of 44 GHz masers performed 6-10 yr ago with a Korean 21-m Korean Very Long Baseline Interferometry Network telescope towards the same targets confirms the kinematic stability of Class I maser line profiles during this time interval and reveals a systematic radial velocity shift of 0.013 +/- 0.005 km s-1 between the two telescopes. |
| WOS关键词 | MASS STAR-FORMATION ; VLBI OBSERVATIONS ; LINE ; ORION ; VARIABILITY ; DATABASE ; REGIONS |
| 资助项目 | Russian Science Foundation[23-22-00124] ; Russian Science Foundation[CIR01-00010] ; Italian Ministry of University |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001296886800011 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | Russian Science Foundation ; Russian Science Foundation ; Italian Ministry of University |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/6968]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Henkel, C.; Levshakov, S. A. |
| 作者单位 | 1.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden 2.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Peoples R China 3.RAS, PN Lebedev Phys Inst, Astro Space Ctr, 84-32 Profsoyuznaya Str, Moscow 117997, Russia 4.Vrije Univ, Dept Phys & Astron, LaserLaB, Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands 5.Petersburg Nucl Phys Inst NRC, Kurchatov Inst, Gatchina 188300, Leningrad Dist, Russia 6.Electrotech Univ LETI, Dept Phys, St Petersburg 197376, Russia 7.Univ Sci & Technol, Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea 8.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 9.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 10.Chinese Acad Sci, Key Lab Radio Astron, 10 Yuanhua Rd, Nanjing 210023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Agafonova, I. I.,Bayandina, O. S.,Gong, Y.,et al. Hyperfine structure of the methanol molecule as traced by Class I methanol masers[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2024,533(2):1714-1732. |
| APA | Agafonova, I. I..,Bayandina, O. S..,Gong, Y..,Henkel, C..,Kim, Kee-Tae.,...&Yang, W..(2024).Hyperfine structure of the methanol molecule as traced by Class I methanol masers.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,533(2),1714-1732. |
| MLA | Agafonova, I. I.,et al."Hyperfine structure of the methanol molecule as traced by Class I methanol masers".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 533.2(2024):1714-1732. |
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