An Enigmatic PeVatron in an Area around H ii Region G35.6−0.5
dc.contributor.author | Cao Z. | |
dc.contributor.author | Aharonian F. | |
dc.contributor.author | Axikegu | |
dc.contributor.author | Bai Y.X. | |
dc.contributor.author | Bao Y.W. | |
dc.contributor.author | Bastieri D. | |
dc.contributor.author | Bi X.J. | |
dc.contributor.author | Bi Y.J. | |
dc.contributor.author | Bian W. | |
dc.contributor.author | Bukevich A.V. | |
dc.contributor.author | Cao Q. | |
dc.contributor.author | Cao W.Y. | |
dc.contributor.author | Cao Z. | |
dc.contributor.author | Chang J. | |
dc.contributor.author | Chang J.F. | |
dc.contributor.author | Chen A.M. | |
dc.contributor.author | Chen B.Q. | |
dc.contributor.author | Chen E.S. | |
dc.contributor.author | Chen H.X. | |
dc.contributor.author | Chen L. | |
dc.contributor.author | Chen L. | |
dc.contributor.author | Chen L. | |
dc.contributor.author | Chen M.J. | |
dc.contributor.author | Chen M.L. | |
dc.contributor.author | Chen Q.H. | |
dc.contributor.author | Chen S. | |
dc.contributor.author | Chen S.H. | |
dc.contributor.author | Chen S.Z. | |
dc.contributor.author | Chen T.L. | |
dc.contributor.author | Chen Y. | |
dc.contributor.author | Cheng N. | |
dc.contributor.author | Cheng Y.D. | |
dc.contributor.author | Chu M.C. | |
dc.contributor.author | Cui M.Y. | |
dc.contributor.author | Cui S.W. | |
dc.contributor.author | Cui X.H. | |
dc.contributor.author | Cui Y.D. | |
dc.contributor.author | Dai B.Z. | |
dc.contributor.author | Dai H.L. | |
dc.contributor.author | Dai Z.G. | |
dc.contributor.author | Danzengluobu | |
dc.contributor.author | Dong X.Q. | |
dc.contributor.author | Duan K.K. | |
dc.contributor.author | Fan J.H. | |
dc.contributor.author | Fan Y.Z. | |
dc.contributor.author | Fang J. | |
dc.contributor.author | Fang J.H. | |
dc.contributor.author | Fang K. | |
dc.contributor.author | Feng C.F. | |
dc.contributor.author | Feng H. | |
dc.contributor.author | Feng L. | |
dc.contributor.author | Feng S.H. | |
dc.contributor.author | Feng X.T. | |
dc.contributor.author | Feng Y. | |
dc.contributor.author | Feng Y.L. | |
dc.contributor.author | Gabici S. | |
dc.contributor.author | Gao B. | |
dc.contributor.author | Gao C.D. | |
dc.contributor.author | Gao Q. | |
dc.contributor.author | Gao W. | |
dc.contributor.author | Gao W.K. | |
dc.contributor.author | Ge M.M. | |
dc.contributor.author | Ge T.T. | |
dc.contributor.author | Geng L.S. | |
dc.contributor.author | Giacinti G. | |
dc.contributor.author | Gong G.H. | |
dc.contributor.author | Gou Q.B. | |
dc.contributor.author | Gu M.H. | |
dc.contributor.author | Guo F.L. | |
dc.contributor.author | Guo J. | |
dc.contributor.author | Guo X.L. | |
dc.contributor.author | Guo Y.Q. | |
dc.contributor.author | Guo Y.Y. | |
dc.contributor.author | Han Y.A. | |
dc.contributor.author | Hannuksela O.A. | |
dc.contributor.author | Hasan M. | |
dc.contributor.author | He H.H. | |
dc.contributor.author | He H.N. | |
dc.contributor.author | He J.Y. | |
dc.contributor.author | He Y. | |
dc.contributor.author | Hor Y.K. | |
dc.contributor.author | Hou B.W. | |
dc.contributor.author | Hou C. | |
dc.contributor.author | Hou X. | |
dc.contributor.author | Hu H.B. | |
dc.contributor.author | Hu Q. | |
dc.contributor.author | Hu S.C. | |
dc.contributor.author | Huang C. | |
dc.contributor.author | Huang D.H. | |
dc.contributor.author | Huang T.Q. | |
dc.contributor.author | Huang W.J. | |
dc.contributor.author | Huang X.T. | |
dc.contributor.author | Huang X.Y. | |
dc.contributor.author | Huang Y. | |
dc.contributor.author | Huang Y.Y. | |
dc.contributor.author | Ji X.L. | |
dc.contributor.author | Jia H.Y. | |
dc.contributor.author | Jia K. | |
dc.contributor.author | Jiang H.B. | |
dc.contributor.author | Jiang K. | |
dc.contributor.correspondence | Cao Z. | |
dc.contributor.other | Mahidol University | |
dc.date.accessioned | 2025-02-01T18:29:45Z | |
dc.date.available | 2025-02-01T18:29:45Z | |
dc.date.issued | 2025-01-20 | |
dc.description.abstract | Identifying Galactic PeVatrons (PeV particle accelerators) from ultrahigh-energy (UHE, >100 TeV) γ-ray sources plays a crucial role in revealing the origin of Galactic cosmic rays. The UHE source 1LHAASO J1857+0203u is suggested to be associated with HESS J1858+020, which may be attributed to the possible PeVatron candidate supernova remnant (SNR) G35.6−0.4 or H ii region G35.6−0.5. We perform detailed analysis on the very-high-energy and UHE γ-ray emissions toward this region with data from the Large High Altitude Air Shower Observatory (LHAASO). 1LHAASO J1857+0203u is detected with a significance of 11.6σ above 100 TeV, indicating the presence of a PeVatron. It has an extent of ∼0 . ° 18 with a power-law (PL) spectral index of ∼2.5 at 1-25 TeV and pointlike emission with a PL spectral index of ∼3.2 above 25 TeV. Using archival CO and H i data, we identify some molecular and atomic clouds that may be associated with the TeV γ-ray emissions. Our modeling indicates that the TeV γ-ray emissions are unlikely to arise from clouds illuminated by the protons that escaped from SNR G35.6−0.4. In the scenario in which H ii region G35.6−0.5 could accelerate particles to the UHE band, the observed GeV-TeV γ-ray emission could be well explained by a hadronic model with a PL spectral index of ∼2.0 and cutoff energy of ∼450 TeV. However, an origin in an evolved pulsar wind nebula cannot be ruled out. | |
dc.identifier.citation | Astrophysical Journal Vol.979 No.1 (2025) | |
dc.identifier.doi | 10.3847/1538-4357/ad991d | |
dc.identifier.eissn | 15384357 | |
dc.identifier.issn | 0004637X | |
dc.identifier.scopus | 2-s2.0-85216125175 | |
dc.identifier.uri | https://repository.li.mahidol.ac.th/handle/20.500.14594/103149 | |
dc.rights.holder | SCOPUS | |
dc.subject | Earth and Planetary Sciences | |
dc.subject | Physics and Astronomy | |
dc.title | An Enigmatic PeVatron in an Area around H ii Region G35.6−0.5 | |
dc.type | Article | |
mu.datasource.scopus | https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85216125175&origin=inward | |
oaire.citation.issue | 1 | |
oaire.citation.title | Astrophysical Journal | |
oaire.citation.volume | 979 | |
oairecerif.author.affiliation | Zhejiang Lab | |
oairecerif.author.affiliation | State Key Laboratory of Particle Detection & Electronics | |
oairecerif.author.affiliation | Université Paris Cité | |
oairecerif.author.affiliation | Yunnan Observatories | |
oairecerif.author.affiliation | Nanjing University | |
oairecerif.author.affiliation | Shanghai Astronomical Observatory Chinese Academy of Sciences | |
oairecerif.author.affiliation | Institute for Nuclear Research of the Russian Academy of Sciences | |
oairecerif.author.affiliation | Shandong University | |
oairecerif.author.affiliation | Yunnan University | |
oairecerif.author.affiliation | Institute of High Energy Physics, Chinese Academy of Sciences | |
oairecerif.author.affiliation | University of Chinese Academy of Sciences | |
oairecerif.author.affiliation | Guangzhou University | |
oairecerif.author.affiliation | Tsinghua University | |
oairecerif.author.affiliation | Shanghai Jiao Tong University | |
oairecerif.author.affiliation | Sun Yat-Sen University | |
oairecerif.author.affiliation | University of Science and Technology of China | |
oairecerif.author.affiliation | Zhengzhou University | |
oairecerif.author.affiliation | Institiúid Ard-Lénn Bhaile Átha Cliath | |
oairecerif.author.affiliation | National Astronomical Observatories Chinese Academy of Sciences | |
oairecerif.author.affiliation | Max-Planck-Institut für Kernphysik | |
oairecerif.author.affiliation | Southwest Jiaotong University | |
oairecerif.author.affiliation | China Center of Advanced Science and Technology World Laboratory | |
oairecerif.author.affiliation | Purple Mountain Observatory Chinese Academy of Sciences | |
oairecerif.author.affiliation | Chinese University of Hong Kong | |
oairecerif.author.affiliation | Hebei Normal University | |
oairecerif.author.affiliation | Tibet University | |
oairecerif.author.affiliation | TIANFU Cosmic Ray Research Center |