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Discovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157

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dc.contributor.authorZhen Caoen_US
dc.contributor.authorF. Aharonianen_US
dc.contributor.authorQ. Anen_US
dc.contributor.authorAxikeguen_US
dc.contributor.authorL. X. Baien_US
dc.contributor.authorY. X. Baien_US
dc.contributor.authorY. W. Baoen_US
dc.contributor.authorD. Bastierien_US
dc.contributor.authorX. J. Bien_US
dc.contributor.authorY. J. Bien_US
dc.contributor.authorH. Caien_US
dc.contributor.authorJ. T. Caien_US
dc.contributor.authorZhe Caoen_US
dc.contributor.authorJ. Changen_US
dc.contributor.authorJ. F. Changen_US
dc.contributor.authorB. M. Chenen_US
dc.contributor.authorE. S. Chenen_US
dc.contributor.authorJ. Chenen_US
dc.contributor.authorLiang Chenen_US
dc.contributor.authorLong Chenen_US
dc.contributor.authorM. J. Chenen_US
dc.contributor.authorM. L. Chenen_US
dc.contributor.authorQ. H. Chenen_US
dc.contributor.authorS. H. Chenen_US
dc.contributor.authorS. Z. Chenen_US
dc.contributor.authorT. L. Chenen_US
dc.contributor.authorX. L. Chenen_US
dc.contributor.authorY. Chenen_US
dc.contributor.authorN. Chengen_US
dc.contributor.authorY. D. Chengen_US
dc.contributor.authorS. W. Cuien_US
dc.contributor.authorX. H. Cuien_US
dc.contributor.authorY. D. Cuien_US
dc.contributor.authorB. D'Ettorre Piazzolien_US
dc.contributor.authorB. Z. Daien_US
dc.contributor.authorH. L. Daien_US
dc.contributor.authorZ. G. Daien_US
dc.contributor.authorDan Zeng Dan-Zeng-Luo-Buen_US
dc.contributor.authorD. Della Volpeen_US
dc.contributor.authorX. J. Dongen_US
dc.contributor.authorK. K. Duanen_US
dc.contributor.authorJ. H. Fanen_US
dc.contributor.authorY. Z. Fanen_US
dc.contributor.authorZ. X. Fanen_US
dc.contributor.authorJ. Fangen_US
dc.contributor.authorK. Fangen_US
dc.contributor.authorC. F. Fengen_US
dc.contributor.authorL. Fengen_US
dc.contributor.authorS. H. Fengen_US
dc.contributor.authorY. L. Fengen_US
dc.contributor.authorB. Gaoen_US
dc.contributor.authorC. D. Gaoen_US
dc.contributor.authorL. Q. Gaoen_US
dc.contributor.authorQ. Gaoen_US
dc.contributor.authorW. Gaoen_US
dc.contributor.authorM. M. Geen_US
dc.contributor.authorL. S. Gengen_US
dc.contributor.authorG. H. Gongen_US
dc.contributor.authorQ. B. Gouen_US
dc.contributor.authorM. H. Guen_US
dc.contributor.authorF. L. Guoen_US
dc.contributor.authorJ. G. Guoen_US
dc.contributor.authorX. L. Guoen_US
dc.contributor.authorY. Q. Guoen_US
dc.contributor.authorY. Y. Guoen_US
dc.contributor.authorY. A. Hanen_US
dc.contributor.authorH. H. Heen_US
dc.contributor.authorH. N. Heen_US
dc.contributor.authorJ. C. Heen_US
dc.contributor.authorS. L. Heen_US
dc.contributor.authorX. B. Heen_US
dc.contributor.authorY. Heen_US
dc.contributor.authorM. Helleren_US
dc.contributor.authorY. K. Horen_US
dc.contributor.authorC. Houen_US
dc.contributor.authorH. B. Huen_US
dc.contributor.authorS. Huen_US
dc.contributor.authorS. C. Huen_US
dc.contributor.authorX. J. Huen_US
dc.contributor.authorD. H. Huangen_US
dc.contributor.authorQ. L. Huangen_US
dc.contributor.authorW. H. Huangen_US
dc.contributor.authorX. T. Huangen_US
dc.contributor.authorX. Y. Huangen_US
dc.contributor.authorZ. C. Huangen_US
dc.contributor.authorF. Jien_US
dc.contributor.authorX. L. Jien_US
dc.contributor.authorH. Y. Jiaen_US
dc.contributor.authorK. Jiangen_US
dc.contributor.authorZ. J. Jiangen_US
dc.contributor.authorC. Jinen_US
dc.contributor.authorT. Keen_US
dc.contributor.authorD. Kuleshoven_US
dc.contributor.authorK. Levochkinen_US
dc.contributor.authorB. B. Lien_US
dc.contributor.authorCheng Lien_US
dc.contributor.authorCong Lien_US
dc.contributor.authorF. Lien_US
dc.contributor.authorH. B. Lien_US
dc.contributor.authorH. C. Lien_US
dc.contributor.otherState Key Laboratory of Particle Detection & Electronicsen_US
dc.contributor.otherNanjing Universityen_US
dc.contributor.otherShanghai Astronomical Observatory Chinese Academy of Sciencesen_US
dc.contributor.otherInstitute for Nuclear Research of the Russian Academy of Sciencesen_US
dc.contributor.otherShandong Universityen_US
dc.contributor.otherWuhan Universityen_US
dc.contributor.otherYunnan Universityen_US
dc.contributor.otherInstitute of High Energy Physics Chinese Academy of Scienceen_US
dc.contributor.otherUniversity of Chinese Academy of Sciencesen_US
dc.contributor.otherGuangzhou Universityen_US
dc.contributor.otherTsinghua Universityen_US
dc.contributor.otherSun Yat-Sen Universityen_US
dc.contributor.otherUniversity of Science and Technology of Chinaen_US
dc.contributor.otherZhengzhou Universityen_US
dc.contributor.otherDublin Institute for Advanced Studiesen_US
dc.contributor.otherUniversità degli Studi di Napoli Federico IIen_US
dc.contributor.otherSichuan Universityen_US
dc.contributor.otherNational Astronomical Observatories Chinese Academy of Sciencesen_US
dc.contributor.otherMax-Planck-Institut für Kernphysiken_US
dc.contributor.otherSouthwest Jiaotong Universityen_US
dc.contributor.otherPurple Mountain Observatory Chinese Academy of Sciencesen_US
dc.contributor.otherUniversité de Genèveen_US
dc.contributor.otherHebei Normal Universityen_US
dc.contributor.otherTibet Universityen_US
dc.contributor.otherTIANFU Cosmic Ray Research Centeren_US
dc.date.accessioned2022-08-04T08:31:57Z
dc.date.available2022-08-04T08:31:57Z
dc.date.issued2021-10-01en_US
dc.description.abstractWe report the discovery of an ultrahigh-energy (UHE) gamma-ray source, LHAASO J2108+5157, by analyzing the LHAASO-KM2A data of 308.33 live days. A significant excess of gamma ray-induced showers is observed in both energy bands of 25-100 and >100 TeV with 9.5σ and 8.5σ, respectively. This source is not significantly favored as an extended source with an angular extension smaller than the point-spread function of KM2A. The measured energy spectrum from 20 to 200 TeV can be approximately described by a power-law function with an index of-2.83 ± 0.18stat. A harder spectrum is demanded at lower energies considering the flux upper limit set by Fermi-LAT observations. The position of the gamma-ray emission is correlated with a giant molecular cloud, which favors a hadronic origin. No obvious counterparts have been found, and deeper multiwavelength observations will help to cast new light on this intriguing UHE source.en_US
dc.identifier.citationAstrophysical Journal Letters. Vol.919, No.2 (2021)en_US
dc.identifier.doi10.3847/2041-8213/ac2579en_US
dc.identifier.issn20418213en_US
dc.identifier.issn20418205en_US
dc.identifier.other2-s2.0-85116440330en_US
dc.identifier.urihttps://repository.li.mahidol.ac.th/handle/123456789/76847
dc.rightsMahidol Universityen_US
dc.rights.holderSCOPUSen_US
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85116440330&origin=inwarden_US
dc.subjectEarth and Planetary Sciencesen_US
dc.subjectPhysics and Astronomyen_US
dc.titleDiscovery of the Ultrahigh-energy Gamma-Ray Source LHAASO J2108+5157en_US
dc.typeArticleen_US
dspace.entity.typePublication
mu.datasource.scopushttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85116440330&origin=inwarden_US

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