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Detection of a new ...
Detection of a new molecular cloud in the LHAASO J2108+5157 region supporting a hadronic PeVatron scenario
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- De La Fuente, Eduardo (author)
- University of Tokyo, Japan,Universidad de Guadalajara,University of Guadalajara
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- Toledano-Juárez, Iván (author)
- Universidad de Guadalajara,University of Guadalajara
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- Kawata, K. (author)
- University of Tokyo, Japan
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- Trinidad, Miguel A. (author)
- Universidad de Guanajuato
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- Tafoya, Daniel, 1981 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Sano, H. (author)
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- Tokuda, Kazuki (author)
- Kyushu University
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- Nishimura, A. (author)
- National Astronomical Observatory of Japan
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- Onishi, Toshikazu (author)
- Osaka Metropolitan University
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- Sako, T. (author)
- University of Tokyo, Japan
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- Hona, Binita (author)
- University of Utah
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- Ohnishi, M. (author)
- University of Tokyo, Japan
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- Takita, M. (author)
- University of Tokyo, Japan
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(creator_code:org_t)
- 2023
- 2023
- English.
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In: Publication of the Astronomical Society of Japan. - 2053-051X .- 0004-6264. ; 75:3, s. 546-566
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Abstract
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- PeVatrons are the most powerful naturally occurring particle accelerators in the Universe. The identification of counterparts associated to astrophysical objects such as dying massive stars, molecular gas, star-forming regions, and star clusters is essential to clarify the underlying nature of the PeV emission, i.e., hadronic or leptonic. We present 12,13CO (J = 2→1) observations made with the 1.85 m radio-Telescope of the Osaka Prefecture University toward the Cygnus OB7 molecular cloud, which contains the PeVatron candidate LHAASO J2108+5157. We investigate the nature of the sub-PeV (gamma-ray) emission by studying the nucleon density determined from the content of H i and H2, derived from the CO observations. In addition to MML[2017]4607, detected via the observations of the optically thick 12CO (J = 1→0) emission, we infer the presence of an optically thin molecular cloud, named [FKT-MC]2022, whose angular size is 1-1 ± 0.}^\circ}}2. We propose this cloud as a new candidate to produce the sub-PeV emission observed in LHAASO J2108+5157. Considering a distance of 1.7 kpc, we estimate a nucleon (H i + H2) density of 37 ± 14 cm-3, and a total nucleon mass(H i + H2) of 1.5 ± 0.6 × 104 M·. On the other hand, we confirm that Kronberger 82 is a molecular clump with an angular size of 0°1, a nucleon density ∼103 cm-3, and a mass ∼103 M·. Although Kronberger 82 hosts the physical conditions to produce the observed emission of LHAASO J2108+5157, [FKT-MC]2022 is located closer to it, suggesting that the latter could be the one associated to the sub-PeV emission. Under this scenario, our results favour a hadronic origin for the emission.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ISM: molecules
- ISM: individual objects (LHAASO J2108+5157
- ISM: clouds
- gamma rays: ISM
- cosmic rays
- Kronberger 82)
Publication and Content Type
- art (subject category)
- ref (subject category)
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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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Tafoya, Daniel, ...
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Sano, H.
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Tokuda, Kazuki
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Nishimura, A.
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Onishi, Toshikaz ...
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Sako, T.
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Hona, Binita
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Ohnishi, M.
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Takita, M.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Chalmers University of Technology