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| Hyperfine structure of the methanol molecule as traced by Class I methanol masers | |
| Agafonova, I. I.1; Bayandina, O. S.2; Gong, Y.3,4,5; Henkel, C.3,6; Kim, Kee-Tae7,8; Kozlov, M. G.9,10; Lankhaar, B.11; Levshakov, S. A.1; Menten, K. M.3; Ubachs, W.12; Val'tts, I. E.13; Yang, W.3,14 | |
| 2024-08-23 | |
| Source Publication | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| ISSN | 0035-8711 |
| Volume | 533Issue:2Pages:1714-1732 |
| Contribution Rank | 5 |
| Abstract | 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. |
| Keyword | elementary particles methods: numerical techniques: spectroscopic ISM: molecules radio lines: ISM |
| DOI | 10.1093/mnras/stae1815 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | MASS STAR-FORMATION ; VLBI OBSERVATIONS ; LINE ; ORION ; VARIABILITY ; DATABASE ; REGIONS |
| Funding Project | Russian Science Foundation[23-22-00124] ; Russian Science Foundation[CIR01-00010] ; Italian Ministry of University |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:001296886800011 |
| Publisher | OXFORD UNIV PRESS |
| Funding Organization | Russian Science Foundation ; Russian Science Foundation ; Italian Ministry of University |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/6969 |
| Collection | 射电天文研究室_恒星形成与演化研究团组 |
| Corresponding Author | Henkel, C.; Levshakov, S. A. |
| Affiliation | 1.Ioffe Inst, 26 Polytekhn Skaya Str, St Petersburg 194021, Russia 2.INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy 3.Max Planck Inst Radioastron MPIfR, Hugel 69, D-53121 Bonn, Germany 4.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China 5.Chinese Acad Sci, Key Lab Radio Astron, 10 Yuanhua Rd, Nanjing 210023, Peoples R China 6.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 7.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 8.Univ Sci & Technol, Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea 9.Electrotech Univ LETI, Dept Phys, St Petersburg 197376, Russia 10.Petersburg Nucl Phys Inst NRC, Kurchatov Inst, Gatchina 188300, Leningrad Dist, Russia 11.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, S-43992 Onsala, Sweden 12.Vrije Univ, Dept Phys & Astron, LaserLaB, Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands 13.RAS, PN Lebedev Phys Inst, Astro Space Ctr, 84-32 Profsoyuznaya Str, Moscow 117997, Russia 14.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Peoples R China |
| Corresponding Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation 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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| Agafonova-2024-Hyper（1833KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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