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Evidence for a gamm...
Evidence for a gamma-ray molecular target in the enigmatic PeVatron candidate LHAASO J2108+5157
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- De La Fuente, Eduardo (författare)
- University of Tokyo, Japan,Universidad de Guadalajara,University of Guadalajara
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- Toledano-Juárez, Iván (författare)
- Universidad de Guadalajara,University of Guadalajara
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- Kawata, K. (författare)
- University of Tokyo, Japan
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- Trinidad, Miguel A. (författare)
- Universidad de Guanajuato
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- Yamagishi, Mitsuyoshi (författare)
- University of Tokyo, Japan
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- Takekawa, S. (författare)
- Kanagawa University
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- Tafoya, Daniel, 1981 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Ohnishi, M. (författare)
- University of Tokyo, Japan
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- Nishimura, A. (författare)
- National Astronomical Observatory of Japan
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- Kato, S. (författare)
- University of Tokyo, Japan
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- Sako, T. (författare)
- University of Tokyo, Japan
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- Takita, M. (författare)
- University of Tokyo, Japan
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Sano, H. (författare)
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Yadav, R. K. (författare)
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(creator_code:org_t)
- 2023
- 2023
- Engelska.
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Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 675
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Context . Peta-eV (PeV) astronomy emerged in 2021 with the discovery of ultra-high-energy gamma-ray sources associated with powerful natural particle accelerators known as PeVatrons. In order to determine the nature of their emission, namely whether it has a hadronic or leptonic origin, it is essential to characterise the physical parameters of the environment where it originates. Aims . We unambiguously confirm the association of molecular gas with the PeVatron candidate LHAASO J2108+5157 using unprecedented high angular-resolution (17′) 12,13CO(J = 1 → 0) observations carried out with the Nobeyama 45m radio telescope. Methods . We characterised a molecular cloud in the vicinity of the PeVatron candidate LHAASO J2108+5157 by determining its physical parameters from our 12,13CO(J = 1 → 0) line observations. We used an updated estimation of the distance to the cloud, which provided a more reliable result. The molecular emission was compared with excess gamma-ray images obtained with Fermi-LAT at energies above 2 GeV to search for spatial correlations and test a possible hadronic (π0 decay) origin for the gamma-ray emission. Results . We find that the morphology of the spatial distribution of the CO emission is strikingly similar to that of the Fermi-LAT excess gamma ray. By combining our observations with archival 21 cm HI line data, the nucleons (HI + H2) number density of the target molecular cloud is found to be 133.0 ± 45.0 cm-3, for the measured angular size of 0.55 ± 0.02 at a distance of 1.6 ± 0.1 kpc. The resulting total mass of the cloud is M(HI + H2) = 7.5±2.9×103M⊙. Under a hadronic scenario, we obtain a total energy of protons of Wp = 4.3 ± 1.5 × 1046 erg with a cutoff of 700±300 TeV, which reproduces the sub-PeV gamma-ray emission. Conclusions . We identified a molecular cloud in the vicinity of LHAASO J2107+5157 as the main target where cosmic rays from an unknown PeVatron produce the observed gamma-ray emission via π0 decay.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- ISM: molecules
- Gamma rays: ISM
- Radio lines: ISM
- ISM: clouds
- ISM: individual objects: LHAASO J2108+5157
- Methods: data analysis
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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De La Fuente, Ed ...
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Toledano-Juárez, ...
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Kawata, K.
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Trinidad, Miguel ...
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Yamagishi, Mitsu ...
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Takekawa, S.
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visa fler...
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Tafoya, Daniel, ...
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Ohnishi, M.
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Nishimura, A.
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Kato, S.
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Sako, T.
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Takita, M.
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Sano, H.
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Yadav, R. K.
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visa färre...
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