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Probing the electro...
Probing the electron-to-proton mass ratio gradient in the Milky Way with Class I methanol masers
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- Levshakov, S. A. (författare)
- National Research Centre "Kurchatov Institute",Russian Academy of Sciences
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Agafonova, I. I. (författare)
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- Henkel, C. (författare)
- Chinese Academy of Sciences,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),King Abdulaziz University
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- Kim, Kee-Tae (författare)
- University of Science and Technology (UST),Korea Astronomy and Space Science Institute
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- Kozlov, M. G. (författare)
- National Research Centre "Kurchatov Institute"
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- Lankhaar, Boy, 1991 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Yang, W. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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(creator_code:org_t)
- 2022-01-11
- 2022
- Engelska.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 511:1, s. 413-424
- Relaterad länk:
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http://arxiv.org/pdf...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
Nyckelord
- elementary particles
- methods: observational
- ISM: molecules
- techniques: spectroscopic
- masers
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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