Related papers: Cygnus X-3 as semi-hidden PeVatron

Photopion Production in Black-Hole Jets and Flat-Spectrum Radio Quasars as PeV Neutrino Sources

The IceCube collaboration has reported neutrinos with energies between ~30 TeV and a few PeV that are significantly enhanced over the cosmic-ray induced atmospheric background. Viable high-energy neutrino sources must contain very…

High Energy Astrophysical Phenomena · Physics 2014-09-29 Charles D. Dermer , Kohta Murase , Yoshiyuki Inoue

Ultra-high-energy $\gamma$-ray imprints from PeV particles accelerated by supernova remnants

The quest for the origin of cosmic ray (CRs) is a fundamental issue in astrophysics. Shocks of supernova remnants (SNRs) have been considered as the dominant contributors to Galactic CRs below the spectral knee near $\sim 3$…

High Energy Astrophysical Phenomena · Physics 2026-04-27 Zhen Cao , F. Aharonian , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , W. Bian , J. Blunier , A. V. Bukevich , C. M. Cai , Y. Y. Cai , W. Y. Cao , Zhe Cao , J. Chang , J. F. Chang , E. S. Chen , G. H. Chen , H. K. Chen , L. F. Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. B. Chen , X. J. Chen , X. P. Chen , Y. Chen , N. Cheng , Q. Y. Cheng , Y. D. Cheng , M. Y. Cui , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , Y. X. Diao , A. J. Dong , X. Q. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , J. Fang , J. H. Fang , K. Fang , C. F. Feng , H. Feng , L. Feng , S. H. Feng , X. T. Feng , Y. Feng , Y. L. Feng , S. Gabici , B. Gao , Q. Gao , W. Gao , W. K. Gao , M. M. Ge , T. T. Ge , L. S. Geng , G. Giacinti , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. Guo , K. J. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , R. P. Han , O. A. Hannuksela , M. Hasan , H. H. He , H. N. He , J. Y. He , X. Y. He , Y. He , S. Hernández-Cadena , B. W. Hou , C. Hou , X. Hou , H. B. Hu , S. C. Hu , C. Huang , D. H. Huang , J. J. Huang , X. L. Huang , X. T. Huang , X. Y. Huang , Y. Huang , Y. Y. Huang , A. Inventar , X. L. Ji , H. Y. Jia , K. Jia , H. B. Jiang , K. Jiang , X. W. Jiang , Z. J. Jiang , M. Jin , S. Kaci , M. M. Kang , I. Karpikov , D. Khangulyan , D. Kuleshov , K. Kurinov , Cheng Li , Cong Li , D. Li , F. Li , H. B. Li , H. C. Li , Jian Li , Jie Li , K. Li , L. Li , R. L. Li , S. D. Li , T. Y. Li , W. L. Li , X. R. Li , Y. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , D. B. Liu , H. Liu , J. Liu , J. L. Liu , J. R. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , X. Liu , Y. Liu , Y. Liu , Y. N. Liu , Y. Q. Lou , Q. Luo , Y. Luo , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , I. O. Maliy , J. R. Mao , Z. Min , W. Mitthumsiri , Y. Mizuno , G. B. Mou , A. Neronov , K. C. Y. Ng , M. Y. Ni , L. Nie , L. J. Ou , Z. W. Ou , P. Pattarakijwanich , Z. Y. Pei , D. Y. Peng , J. C. Qi , M. Y. Qi , J. J. Qin , D. Qu , A. Raza , C. Y. Ren , D. Ruffolo , A. Sáiz , D. Savchenko , D. Semikoz , L. Shao , O. Shchegolev , Y. Z. Shen , X. D. Sheng , Z. D. Shi , F. W. Shu , H. C. Song , Yu. V. Stenkin , Y. Su , D. X. Sun , H. Sun , J. X. Sun , Q. N. Sun , X. N. Sun , Z. B. Sun , N. H. Tabasam , J. Takata , P. H. T. Tam , H. B. Tan , Q. W. Tang , R. Tang , Z. B. Tang , W. W. Tian , C. N. Tong , L. H. Wan , C. Wang , D. H. Wang , G. W. Wang , H. G. Wang , J. C. Wang , K. Wang , Kai Wang , Kai Wang , L. P. Wang , L. Y. Wang , L. Y. Wang , R. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Z. H. Wang , Z. X. Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , S. S. Weng , C. Y. Wu , H. R. Wu , Q. W. Wu , S. Wu , X. F. Wu , Y. S. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , Y. F. Xiao , Y. L. Xin , H. D. Xing , Y. Xing , D. R. Xiong , B. N. Xu , C. Y. Xu , D. L. Xu , R. F. Xu , R. X. Xu , S. S. Xu , W. L. Xu , L. Xue , D. H. Yan , T. Yan , C. W. Yang , C. Y. Yang , F. F. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , W. X. Yang , Z. H. Yang , Z. G. Yao , X. A. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Q. Yuan , H. Yue , H. D. Zeng , T. X. Zeng , W. Zeng , X. T. Zeng , M. Zha , B. B. Zhang , B. T. Zhang , C. Zhang , H. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. Y. Zhang , Li Zhang , P. F. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , S. Y. Zhang , W. Zhang , W. Y. Zhang , X. Zhang , X. P. Zhang , Yi Zhang , Yong Zhang , Z. P. Zhang , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , X. H. Zhao , Z. H. Zhao , F. Zheng , T. C. Zheng , B. Zhou , H. Zhou , J. N. Zhou , M. Zhou , P. Zhou , R. Zhou , X. X. Zhou , X. X. Zhou , B. Y. Zhu , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , Y. C. Zou , X. Zuo , Y. Li

X-rays and Gamma-rays from Cataclysmic Variables: The example case of Intermediate Polar V1223 Sgr

The accretion of matter onto intermediate polar White Dwarfs (IPWDs) seems to provide attractive conditions for acceleration of particles to high energies in a strongly magnetized turbulent region at the accretion disk inner radius. We…

High Energy Astrophysical Phenomena · Physics 2015-05-20 W. Bednarek , J. Pabich

The diffuse gamma-ray flux associated with sub-PeV/PeV neutrinos from starburst galaxies

One attractive scenario for the excess of sub-PeV/PeV neutrinos recently reported by IceCube is that they are produced by cosmic rays in starburst galaxies colliding with the dense interstellar medium. These proton-proton ($pp$) collisions…

High Energy Astrophysical Phenomena · Physics 2015-06-19 Xiao-Chuan Chang , Xiang-Yu Wang

Modeling gamma-ray signatures of particle acceleration in stellar clusters from GeV to PeV

Young massive stellar clusters (YMSCs) have recently regained interest as PeVatron candidates, potentially accounting for the cosmic-ray (CR) knee as alternatives to isolated supernova remnants (SNRs). LHAASO's unique capability to detect…

High Energy Astrophysical Phenomena · Physics 2025-10-15 A. Inventar , S. Gabici , E. Peretti

Diffusive or Ballistic? Distributions and Spectra of PeV Cosmic Rays around Microquasars

In the standard Galactic cosmic-ray (CR) paradigm, protons are accelerated up to ~1 PeV by Galactic sources. While supernova remnants (SNRs) have been traditionally considered as the primary accelerators, recent observations by LHAASO and…

High Energy Astrophysical Phenomena · Physics 2026-01-22 Yutaka Fujita , Rohta Takahashi , Norita Kawanaka

Ultrahigh-energy neutrinos as a probe of espresso-shear acceleration in jets of Centaurus A

It has been suggested that Centaurus A (Cen A) could make a contribution to the observed ultrahigh-energy cosmic-ray (UHECR) flux. We calculate the flux of astrophysical neutrinos produced by UHECRs accelerated in the jet of Cen A, a…

High Energy Astrophysical Phenomena · Physics 2025-06-30 Rostom Mbarek , Damiano Caprioli , Kohta Murase

High-energy particles and radiation in star-forming regions

Non-thermal particles and high-energy radiation can play a role in the dynamical processes in star-forming regions and provide an important piece of the multiwavelength observational picture of their structure and components. Powerful…

High Energy Astrophysical Phenomena · Physics 2020-10-05 A. M. Bykov , A. Marcowith , E. Amato , M. E. Kalyashova , J. M. D. Kruijssen , E. Waxman

Searches for Neutrinos from LHAASO ultra-high-energy {\gamma}-ray sources using the IceCube Neutrino Observatory

Galactic PeVatrons are Galactic sources theorized to accelerate cosmic rays up to PeV in energy. The accelerated cosmic rays are expected to interact hadronically with nearby ambient gas or the interstellar medium, resulting in…

High Energy Astrophysical Phenomena · Physics 2023-03-15 R. Abbasi , M. Ackermann , J. Adams , N. Aggarwal , J. A. Aguilar , M. Ahlers , J. M. Alameddine , A. A. Alves , N. M. Amin , K. Andeen , T. Anderson , G. Anton , C. Argüelles , Y. Ashida , S. Athanasiadou , S. N. Axani , X. Bai , A. Balagopal V. , M. Baricevic , S. W. Barwick , V. Basu , R. Bay , J. J. Beatty , K. -H. Becker , J. Becker Tjus , J. Beise , C. Bellenghi , S. BenZvi , D. Berley , E. Bernardini , D. Z. Besson , G. Binder , D. Bindig , E. Blaufuss , S. Blot , F. Bontempo , J. Y. Book , J. Borowka , C. Boscolo Meneguolo , S. Böser , O. Botner , J. Böttcher , E. Bourbeau , J. Braun , B. Brinson , J. Brostean-Kaiser , R. T. Burley , R. S. Busse , M. A. Campana , E. G. Carnie-Bronca , Y. L. Chang , C. Chen , Z. Chen , D. Chirkin , S. Choi , B. A. Clark , L. Classen , A. Coleman , G. H. Collin , A. Connolly , J. M. Conrad , P. Coppin , P. Correa , S. Countryman , D. F. Cowen , C. Dappen , P. Dave , C. De Clercq , J. J. DeLaunay , D. Delgado López , H. Dembinski , K. Deoskar , A. Desai , P. Desiati , K. D. de Vries , G. de Wasseige , T. DeYoung , A. Diaz , J. C. Díaz-Vélez , M. Dittmer , H. Dujmovic , M. A. DuVernois , T. Ehrhardt , P. Eller , R. Engel , H. Erpenbeck , J. Evans , P. A. Evenson , K. L. Fan , A. R. Fazely , A. Fedynitch , N. Feigl , S. Fiedlschuster , A. T. Fienberg , C. Finley , L. Fischer , D. Fox , A. Franckowiak , E. Friedman , A. Fritz , P. Fürst , T. K. Gaisser , J. Gallagher , E. Ganster , A. Garcia , S. Garrappa , L. Gerhardt , A. Ghadimi , C. Glaser , T. Glauch , T. Glüsenkamp , N. Goehlke , J. G. Gonzalez , S. Goswami , D. Grant , S. J. Gray , T. Grégoire , S. Griffin , S. Griswold , C. Günther , P. Gutjahr , C. Haack , A. Hallgren , R. Halliday , L. Halve , F. Halzen , H. Hamdaoui , M. Ha Minh , K. Hanson , J. Hardin , A. A. Harnisch , P. Hatch , A. Haungs , K. Helbing , J. Hellrung , F. Henningsen , L. Heuermann , S. Hickford , A. Hidvegi , C. Hill , G. C. Hill , K. D. Hoffman , K. Hoshina , W. Hou , T. Huber , K. Hultqvist , M. Hünnefeld , R. Hussain , K. Hymon , S. In , N. Iovine , A. Ishihara , M. Jansson , G. S. Japaridze , M. Jeong , M. Jin , B. J. P. Jones , D. Kang , W. Kang , X. Kang , A. Kappes , D. Kappesser , L. Kardum , T. Karg , M. Karl , A. Karle , U. Katz , M. Kauer , J. L. Kelley , A. Kheirandish , K. Kin , J. Kiryluk , S. R. Klein , A. Kochocki , R. Koirala , H. Kolanoski , T. Kontrimas , L. Köpke , C. Kopper , D. J. Koskinen , P. Koundal , M. Kovacevich , M. Kowalski , T. Kozynets , K. Kruiswijk , E. Krupczak , A. Kumar , E. Kun , N. Kurahashi , N. Lad , C. Lagunas Gualda , M. Lamoureux , M. J. Larson , F. Lauber , J. P. Lazar , J. W. Lee , K. Leonard DeHolton , A. Leszczyńska , M. Lincetto , Q. R. Liu , M. Liubarska , E. Lohfink , C. Love , C. J. Lozano Mariscal , L. Lu , F. Lucarelli , A. Ludwig , W. Luszczak , Y. Lyu , W. Y. Ma , J. Madsen , K. B. M. Mahn , Y. Makino , S. Mancina , W. Marie Sainte , I. C. Mariş , S. Marka , Z. Marka , M. Marsee , I. Martinez-Soler , R. Maruyama , F. Mayhew , T. McElroy , F. McNally , J. V. Mead , K. Meagher , S. Mechbal , A. Medina , M. Meier , S. Meighen-Berger , Y. Merckx , L. Merten , J. Micallef , D. Mockler , T. Montaruli , R. W. Moore , Y. Morii , R. Morse , M. Moulai , T. Mukherjee , R. Naab , R. Nagai , U. Naumann , A. Nayerhoda , J. Necker , M. Neumann , H. Niederhausen , M. U. Nisa , A. Noell , S. C. Nowicki , A. Obertacke Pollmann , M. Oehler , B. Oeyen , A. Olivas , R. Orsoe , J. Osborn , E. O'Sullivan , H. Pandya , D. V. Pankova , N. Park , G. K. Parker , E. N. Paudel , L. Paul , C. Pérez de los Heros , J. Peterson , S. Philippen , S. Pieper , A. Pizzuto , M. Plum , Y. Popovych , A. Porcelli , M. Prado Rodriguez , B. Pries , R. Procter-Murphy , G. T. Przybylski , C. Raab , J. Rack-Helleis , M. Rameez , K. Rawlins , Z. Rechav , A. Rehman , P. Reichherzer , G. Renzi , E. Resconi , S. Reusch , W. Rhode , M. Richman , B. Riedel , E. J. Roberts , S. Robertson , S. Rodan , G. Roellinghoff , M. Rongen , C. Rott , T. Ruhe , L. Ruohan , D. Ryckbosch , D. Rysewyk Cantu , S. Athanasiadou , I. Safa , J. Saffer , D. Salazar-Gallegos , P. Sampathkumar , S. E. Sanchez Herrera , A. Sandrock , M. Santander , S. Sarkar , S. Sarkar , J. Savelberg , P. Savina , M. Schaufel , H. Schieler , S. Schindler , B. Schlueter , T. Schmidt , J. Schneider , F. G. Schröder , L. Schumacher , G. Schwefer , S. Sclafani , D. Seckel , S. Seunarine , A. Sharma , S. Shefali , N. Shimizu , M. Silva , B. Skrzypek , B. Smithers , R. Snihur , J. Soedingrekso , A. Søgaard , D. Soldin , C. Spannfellner , G. M. Spiczak , C. Spiering , M. Stamatikos , T. Stanev , R. Stein , T. Stezelberger , T. Stürwald , T. Stuttard , G. W. Sullivan , I. Taboada , S. Ter-Antonyan , W. G. Thompson , J. Thwaites , S. Tilav , K. Tollefson , C. Tönnis , S. Toscano , D. Tosi , A. Trettin , C. F. Tung , R. Turcotte , J. P. Twagirayezu , B. Ty , M. A. Unland Elorrieta , K. Upshaw , N. Valtonen-Mattila , J. Vandenbroucke , N. van Eijndhoven , D. Vannerom , J. van Santen , J. Vara , J. Veitch-Michaelis , S. Verpoest , D. Veske , C. Walck , T. B. Watson , C. Weaver , P. Weigel , A. Weindl , J. Weldert , C. Wendt , J. Werthebach , M. Weyrauch , N. Whitehorn , C. H. Wiebusch , N. Willey , D. R. Williams , M. Wolf , G. Wrede , J. Wulff , D. L. Xu , X. W. Xu , J. P. Yanez , E. Yildizci , S. Yoshida , S. Yu , T. Yuan , Z. Zhang , P. Zhelnin

High-energy Neutrino and Gamma Ray Emission from Clusters-like Perseus

We calculate the high-energy gamma-ray and neutrino emissions from galaxy clusters like Perseus that host active galactic nuclei (AGNs). Our primary objective is to distinguish the emission from the central source, such as NGC$1275$, from…

High Energy Astrophysical Phenomena · Physics 2026-05-13 Saqib Hussain , Gabrijela Zaharijas , Klaus Dolag

Neutrinos from Clusters of Galaxies and Radio Constraints

Cosmic-ray (CR) protons can accumulate for cosmological times in clusters of galaxies. Their hadronic interactions with protons of the intra-cluster medium (ICM) generate secondary electrons, gamma-rays and high-energy neutrinos. In light…

High Energy Astrophysical Phenomena · Physics 2015-09-07 Fabio Zandanel , Irene Tamborra , Stefano Gabici , Shin'ichiro Ando

Ultrahigh Energy Cosmic Ray Production in Binary Neutron Star Mergers

Having previously argued that binary neutron star mergers are the principle source of ultrahigh energy cosmic rays~\citep{fBNS-prl25}, we exploit here the highly constrained initial conditions to make quantitative predictions for the cutoff…

High Energy Astrophysical Phenomena · Physics 2025-11-04 Glennys R. Farrar

PeV-EeV neutrinos from gamma-ray blazars due to ultrahigh-energy cosmic-ray propagation

Blazars are potential candidates of cosmic-ray acceleration up to ultrahigh energies ($E\gtrsim10^{18}$ eV). For an efficient cosmic-ray injection from blazars, $p\gamma$ collisions with the extragalactic background light (EBL) and cosmic…

High Energy Astrophysical Phenomena · Physics 2021-12-15 Saikat Das , Nayantara Gupta , Soebur Razzaque

Wind accretion in Cygnus X-1

Context: Cygnus X-1 is a black hole X-ray binary system in which the black hole captures and accretes gas from the strong stellar wind emitted by its supergiant O9.7 companion star. The irradiation of the supergiant star essentially…

High Energy Astrophysical Phenomena · Physics 2020-05-20 Emmi Meyer-Hofmeister , B. F. Liu , E. Qiao , Ronald E. Taam

Multimessenger Concordance for the Cygnus Region as the Source of the Cosmic-Ray Knee

The origin of the cosmic-ray (CR) knee remains one of the central open questions in particle astrophysics. Recent measurements by the Large High Altitude Air Shower Observatory revealed a pronounced feature in the proton spectrum at…

High Energy Astrophysical Phenomena · Physics 2026-03-24 Luis E. Espinosa Castro , Kotha Murase , Carlo Rizza , Francesco L. Villante , Vittoria Vecchiotti , Giulia Pagliaroli

Multimessenger Emission from Very-High-Energy Black Hole-Jet Systems in the Milky Way

Microquasars, compact binary systems with an accreting stellar-mass black hole or neutron star, are promising candidates for high-energy particle acceleration. Recently, the LHAASO collaboration reported on the detection of $>100$ TeV…

High Energy Astrophysical Phenomena · Physics 2026-01-21 Jose Carpio , Ali Kheirandish , Bing Zhang

Binary neutron star mergers as the source of the highest energy cosmic rays

We propose that ultrahigh energy cosmic rays are produced in binary neutron star mergers. This scenario can account for the heretofore inexplicable narrow rigidity range of UHECRs, because the jets of BNS mergers are generated by a…

High Energy Astrophysical Phenomena · Physics 2025-03-04 Glennys R. Farrar

Contribution of the Cygnus bubble to the Galactic cosmic ray spectrum and diffuse $\gamma$-ray emissions

Since the discovery of cosmic rays (CRs) over a century ago, their origin has remained a mystery and a key research question. Recently, the LHAASO experiment identified the first CR super-acceleration source, the Cygnus bubble, which can…

High Energy Astrophysical Phenomena · Physics 2024-08-06 Lin Nie , Xiang-Li Qian , Yi-Qing Guo , Si-Ming Liu

The hypersoft state of Cygnus X-3 - A key to jet quenching in X-ray binaries?

Cygnus X-3 is a unique microquasar in the Galaxy hosting a Wolf-Rayet companion orbiting a compact object that most likely is a low-mass black hole. The unique source properties are likely due to the interaction of the compact object with…

High Energy Astrophysical Phenomena · Physics 2018-04-18 K. I. I. Koljonen , T. Maccarone , M. L. McCollough , M. Gurwell , S. A. Trushkin , G. G. Pooley , G. Piano , M. Tavani

A comprehensive search for high-velocity X-ray sources: New compact object binary candidates in the Gaia era

We perform a comprehensive search for high-velocity X-ray sources with large X-ray/optical flux ratios ($F_\mathrm{X}/F_\mathrm{G}$), identifying candidates for interacting black hole or neutron star binaries potentially accelerated by…

High Energy Astrophysical Phenomena · Physics 2026-02-25 Yue Zhao , Poshak Gandhi , Christian Knigge , Phil Charles , Daniel Stern , Peter Boorman , Pornisara Nuchvanichakul , Cordelia Dashwood Brown , David A. H. Buckley