Probing the electron-to-proton mass ratio gradient in the Milky Way with Class I methanol masers
文献类型：期刊论文
| 作者 | Levshakov, S. A.7,8,9; Agafonova, I. I.7; Henkel, C.4,5,6; Kim, Kee-Tae2,3; Kozlov, M. G.7,8; Lankhaar, B.1; Yang, W.6 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2022-02-01 |
| 卷号 | 511期号:1页码:413-424 |
| ISSN号 | 0035-8711 |
| 关键词 | elementary particles ISM: molecules masers methods: observational techniques: spectroscopic |
| DOI | 10.1093/mnras/stac024 |
| 通讯作者 | Levshakov, S. A.(lev@astro.ioffe.ru) ; Agafonova, I. I.(ira@astro.ioffe.ru) ; Henkel, C.(chenkel@mpifr-bonn.mpg.de) |
| 英文摘要 | We estimate limits on non-universal coupling of hypothetical hidden fields to standard matter by evaluating the fractional changes in the electron-to-proton mass ratio, mu = m(e)/m(p), based on observations of Class I methanol masers distributed in the Milky Way disc over the range of the Galactocentric distances 4 less than or similar to R less than or similar to 12 kpc. The velocity offsets Delta V = V-44 - V-95 measured between the 44- and 95-GHz methanol lines provide, so far, one of the most stringent constraints on the spatial gradient k(mu)= d(Delta mu/mu)/dR < 2 x10(-9) kpc(-1) and the upper limit on Delta mu/mu <2 x 10(-8), where Delta mu/mu = (mu(obs) - mu(lab))/mu(lab). We also find that the offsets Delta V are clustered into two groups which are separated by delta(Delta V) = 0.022 +/- 0.003 km s(-1) (1 sigma confidence level). The grouping is most probably due to the dominance of different hyperfine transitions in the 44- and 95-GHz methanol maser emission. Which transition becomes favoured is determined by an alignment (polarization) of the nuclear spins of the four hydrogen atoms in the methanol molecule. This result confirms that there are preferred hyperfine transitions involved in the methanol maser action. |
| WOS关键词 | MAGNETIC-FIELDS ; ASTRONOMICAL MASERS ; LINEAR-POLARIZATION ; MOLECULES ; MICROWAVE ; SUBMILLIMETER ; DEPENDENCE ; DISCOVERY ; CATALOG ; STATES |
| 资助项目 | Russian Science Foundation[19-12-00157] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | OXFORD UNIV PRESS |
| WOS记录号 | WOS:000770033900024 |
| 资助机构 | Russian Science Foundation |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4581]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | Levshakov, S. A.; Agafonova, I. I.; Henkel, C. |
| 作者单位 | 1.Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, S-43992 Onsala, Sweden 2.Univ Sci & Technol, Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea 3.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 4.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 5.King Abdulaziz Univ, Dept Astron & Space Sci, POB 80203, Jeddah 21589, Saudi Arabia 6.Max Planck Inst Radioastron, Auf Hugel 69, D-53121 Bonn, Germany 7.Electrotech Univ LETI, Dept Phys, St Petersburg 197376, Russia 8.NRC Kurchatov Inst, Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Distr, Russia 9.Ioffe Phys Tech Inst, St Petersburg 194021, Russia |
| 推荐引用方式 GB/T 7714 | Levshakov, S. A.,Agafonova, I. I.,Henkel, C.,et al. Probing the electron-to-proton mass ratio gradient in the Milky Way with Class I methanol masers[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2022,511(1):413-424. |
| APA | Levshakov, S. A..,Agafonova, I. I..,Henkel, C..,Kim, Kee-Tae.,Kozlov, M. G..,...&Yang, W..(2022).Probing the electron-to-proton mass ratio gradient in the Milky Way with Class I methanol masers.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,511(1),413-424. |
| MLA | Levshakov, S. A.,et al."Probing the electron-to-proton mass ratio gradient in the Milky Way with Class I methanol masers".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 511.1(2022):413-424. |
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