We present a simple phenomenological model of hadronic interaction between protons accelerated in an old supernova remnant (SNR) and cold protons situated within the associated molecular clouds (MCs). The accelerated protons from the old SNR escaped the SNR shock front, and got injected into the MCs at an earlier time, producing ultra high energy gamma-rays and neutrinos through inelastic proton-proton interaction. We also take into account the acceleration and subsequent escape of electrons from the SNR shock front. The escaped electrons produce gamma-rays through various radiative cooling mechanisms, after getting injected into the MCs. We use the model discussed in this letter to explain the multiwavelength (MWL) spectral energy distribution (SED) of unidentified Galactic ultra high energy gamma-ray source LHAASO J2108+5157. We also discuss the feasibility of applying this model in other cases as well. Future observations can test the viability of the model discussed in this letter, which will in turn confirm that the SNRs can, in fact, accelerate particles up to PeV energies.
The unidentified PeV source LHAASO J2108+5157: A microquasar remnant?
Universidad de Jaén（哈恩大学）；Instituto Argentino de Radioastronomía (CCT La Plata, CONICET（阿根廷射电天文研究所）；CICPBA（拉普拉塔国立大学天文与地球科学学院）；UNLP)（巴塞罗那大学）；Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata；Universitat de Barcelona
A Self-Consistent Model of the Ultra High-Energy Gamma-Ray Emission of Pulsar Wind Nebulae: Insights from LHAASO and ATNF Catalogs
Tsung-Dao Lee Institute, Shanghai Jiao Tong University（上海交大李政道研究所）；School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院）；APC, Université Paris Cité, CNRS/IN2P3, CEA/IRFU, Observatoire de Paris（巴黎西岱大学 APC 实验室）
Oblique Shocks at Supernova Remnants in Massive Star Clusters: A Model for the Cosmic-Ray Knee Observed by LHAASO
Universidade Estadual de Londrina (UEL)（隆德里纳州立大学）；INAF-Osservatorio Astrofisico di Arcetri（意大利国家天体物理研究所阿切特里天文台）；Universidade Federal do Paraná (UFPR)（巴拉那联邦大学）；Universidade Federal do Espírito Santo (UFES)（圣埃斯皮里图联邦大学）；Universidade Tecnológica do Paraná (UTFPR)（巴拉那技术大学）；Universidade Federal da Integração Latino-Americana (UNILA)（拉丁美洲一体化联邦大学）
Instituto Argentino de Radioastronomía (CCT La Plata, CONICET（阿根廷射电天文研究所）；CICPBA（拉普拉塔国立大学天文与地球物理学院）；UNLP)（巴塞罗那大学宇宙科学研究所）；Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata；Departament de Física Quàntica i Astrofísica, Institut de Ciències del Cosmos (ICC), Universitat de Barcelona (IEEC-UB)
LHAASO Constraints on New-Source Cosmic Rays:Abundance Scenarios and Injection Spectral Indices
Hebei Normal University（河北师范大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；Tangshan University（唐山学院）；Xizang University（西藏大学）；Sichuan University（四川大学）；University of Chinese Academy of Sciences（中国科学院大学）
IRAP, Université de Toulouse, CNRS, CNES（图卢兹大学 IRAP 研究所）；Institut supérieur de l’aéronautique et de l’espace, Université de Toulouse（图卢兹大学高等航空与航天学院）；Université Bordeaux, CNRS, LP2I Bordeaux（波尔多大学 LP2I 实验室）；LUPM, Université de Montpellier, CNRS/IN2P3（蒙彼利埃大学 LUPM 实验室）；School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）；Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education（南京大学现代天文与天体物理教育部重点实验室）
Constraining Cosmic-Ray Acceleration and Escape in Middle-Aged Supernova Remnants with GeV-TeV Gamma-Ray Observations
Southwest Jiaotong University（西南交通大学）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）
Microquasar remnants as reservoirs of PeV cosmic rays
Instituto Argentino de Radioastronomía (CCT La Plata, CONICET（阿根廷射电天文研究所）；CICPBA（拉普拉塔国立大学天文学与地球物理学学院）；UNLP)（巴塞罗那大学量子物理与天体物理系、宇宙科学研究所）；Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata；Departament de Física Quàntica i Astrofísica, Institut de Ciències del Cosmos (ICC), Universitat de Barcelona (IEEC-UB)
LOFAR follow-up of sources in the First LHAASO Catalogue
Instituto de Astrofísica de Andalucía (IAA-CSIC)（安达卢西亚天体物理研究所）；ASTRON Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；Centre for Astrophysics Research, Department of Physics, Astronomy and Mathematics, University of Hertfordshire（赫特福德大学物理、天文与数学系天体物理学研究中心）；Centre for Extragalactic Astronomy, Department of Physics, Durham University（杜伦大学物理系河外天文研究中心）；Institute for Computational Cosmology, Department of Physics, Durham University（杜伦大学物理系计算宇宙学研究所）
The Origin of Multi-TeV Gamma-rays in LHAASO J0341+5258 via Cosmic Ray Illumination of Molecular Clouds
Gran Sasso Science Institute (GSSI)（格兰萨索科学研究所）；INFN - Laboratori Nazionali del Gran Sasso（意大利国家核物理研究所-格兰萨索国家实验室）；INAF - Istituto di Astrofisica e Planetologia Spaziali (IAPS)（意大利国家天体物理研究所-空间天体物理学与行星学研究所）；Università di Roma Tor Vergata（罗马托尔维尔加塔大学）；Aryabhatta Research Institute of Observational Sciences (ARIES)（阿亚巴哈达观测科学研究所）；Centre for Astro-Particle Physics (CAPP) and Department of Physics, University of Johannesburg（约翰内斯堡大学天体粒子物理中心及物理系）
Resolving the origin of the unidentified TeV source HESS J1626-490 as a relic of the ancient cosmic-ray factory SNR G335.2+0.1
Ritsumeikan University（立命馆大学）；Research Organization of Science and Technology, Ritsumeikan University（立命馆大学科学技术研究院）；Kyoto University（京都大学）；Yukawa Institute for Theoretical Physics, Kyoto University（京都大学汤川理论物理研究所）；Tohoku University（东北大学）；Gifu University（岐阜大学）；University of Miyazaki（宫崎大学）；Konan University（神户女学院大学）
