Constraining the redshift distribution of ultrahigh–energy–cosmic–ray sources by isotropic gamma-ray background

2017 ◽  
Author(s):  
Ruo-Yu Liu ◽  
Andrew Taylor ◽  
Xiang-Yu Wang ◽  
Felix Aharonian
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Redshift Distribution

scholarly journals Interpreting correlated observations of cosmic rays and gamma-rays from Centaurus A with a proton blazar inspired model

2020 ◽  
Vol 500 (1) ◽  
pp. 1087-1094
Author(s):  
Prabir Banik ◽  
Arunava Bhadra ◽  
Abhijit Bhattacharyya
Keyword(s):  
Cosmic Rays ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
High Energy ◽  
Energy Scale ◽  
Electromagnetic Spectrum ◽  
Ultrahigh Energy ◽  
Large Area ◽  
Centaurus A

ABSTRACT The nearest active radio galaxy Centaurus (Cen) A is a gamma-ray emitter in GeV–TeV energy scale. The high energy stereoscopic system (HESS) and non-simultaneous Fermi–Large Area Telescope observation indicate an unusual spectral hardening above few GeV energies in the gamma-ray spectrum of Cen A. Very recently the HESS observatory resolved the kilo parsec (kpc)-scale jets in Centaurus A at TeV energies. On the other hand, the Pierre Auger Observatory (PAO) detects a few ultrahigh energy cosmic ray (UHECR) events from Cen-A. The proton blazar inspired model, which considers acceleration of both electrons and hadronic cosmic rays in active galactic nuclei (AGN) jet, can explain the observed coincident high-energy neutrinos and gamma-rays from Ice-cube detected AGN jets. Here, we have employed the proton blazar inspired model to explain the observed GeV–TeV gamma-ray spectrum features including the spectrum hardening at GeV energies along with the PAO observation on cosmic rays from Cen-A. Our findings suggest that the model can explain consistently the observed electromagnetic spectrum in combination with the appropriate number of UHECRs from Cen A.

scholarly journals Ultrahigh-energy diffuse gamma-ray emission from cosmic-ray interactions with the medium surrounding acceleration sources

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
Pei-pei Zhang ◽  
Bing-qiang Qiao ◽  
Qiang Yuan ◽  
Shu-wang Cui ◽  
Yi-qing Guo
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Cosmic Ray Interactions ◽  
Gamma Ray Emission

scholarly journals Modeling the spectrum and composition of ultrahigh-energy cosmic rays with two populations of extragalactic sources

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Saikat Das ◽  
Soebur Razzaque ◽  
Nayantara Gupta
Keyword(s):  
Population Model ◽  
Gamma Ray ◽  
Statistical Significance ◽  
Cosmic Ray ◽  
Source Population ◽  
Ultrahigh Energy ◽  
Fermi Acceleration ◽  
Evolution Parameter ◽  
Best Fit ◽  
Two Populations

AbstractWe fit the ultrahigh-energy cosmic-ray (UHECR, $$E\gtrsim 0.1$$ E ≳ 0.1 EeV) spectrum and composition data from the Pierre Auger Observatory at energies $$E\gtrsim 5\cdot 10^{18}$$ E ≳ 5 · 10 18 eV, i.e., beyond the ankle using two populations of astrophysical sources. One population, accelerating dominantly protons ($$^1$$ 1 H), extends up to the highest observed energies with maximum energy close to the GZK cutoff and injection spectral index near the Fermi acceleration model; while another population accelerates light-to-heavy nuclei ($$^4$$ 4 He, $$^{14}$$ 14 N, $$^{28}$$ 28 Si, $$^{56}$$ 56 Fe) with a relatively low rigidity cutoff and hard injection spectrum. A significant improvement in the combined fit is noted as we go from a one-population to two-population model. For the latter, we constrain the maximum allowed proton fraction at the highest-energy bin within 3.5$$\sigma $$ σ statistical significance. In the single-population model, low-luminosity gamma-ray bursts turn out to match the best-fit evolution parameter. In the two-population model, the active galactic nuclei is consistent with the best-fit redshift evolution parameter of the pure proton-emitting sources, while the tidal disruption events could be responsible for emitting heavier nuclei. We also compute expected cosmogenic neutrino flux in such a hybrid source population scenario and discuss possibilities to detect these neutrinos by upcoming detectors to shed light on the sources of UHECRs.

scholarly journals PeV–EeV Neutrinos from Gamma-Ray Blazars due to Ultrahigh-energy Cosmic-Ray Propagation

2021 ◽  
Vol 910 (2) ◽  
pp. 100
Author(s):  
Saikat Das ◽  
Nayantara Gupta ◽  
Soebur Razzaque
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Ultrahigh Energy

scholarly journals COSMIC CONNECTIONS: FROM COSMIC RAYS TO GAMMA RAYS, COSMIC BACKGROUNDS AND MAGNETIC FIELDS

2013 ◽  
Vol 28 (02) ◽  
pp. 1340001 ◽  
Author(s):  
ALEXANDER KUSENKO
Keyword(s):  
Cosmic Rays ◽  
Magnetic Fields ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Extragalactic Background Light ◽  
Holistic Treatment ◽  
Galactic Sources ◽  
Combined Data

Combined data from gamma-ray telescopes and cosmic-ray detectors have produced some new surprising insights regarding intergalactic and galactic magnetic fields, as well as extragalactic background light. We review some recent advances, including a theory explaining the hard spectra of distant blazars and the measurements of intergalactic magnetic fields based on the spectra of distant sources. Furthermore, we discuss the possible contribution of transient galactic sources, such as past gamma-ray bursts and hypernova explosions in the Milky Way, to the observed flux of ultrahigh-energy cosmic-rays nuclei. The need for a holistic treatment of gamma rays, cosmic rays, and magnetic fields serves as a unifying theme for these seemingly unrelated phenomena.

scholarly journals Low-luminosity gamma-ray bursts as the sources of ultrahigh-energy cosmic ray nuclei

2018 ◽  
Vol 97 (8) ◽  
Author(s):  
B. Theodore Zhang ◽  
Kohta Murase ◽  
Shigeo S. Kimura ◽  
Shunsaku Horiuchi ◽  
Peter Mészáros
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Ray Bursts ◽  
Ultrahigh Energy

scholarly journals UVscope and its application aboard the ASTRI-Horn telescope

2021 ◽  
Author(s):  
Maria Concetta Maccarone ◽  
Giovanni La Rosa ◽  
Osvaldo Catalano ◽  
Salvo Giarrusso ◽  
Alberto Segreto ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Single Photon ◽  
Photon Counting ◽  
Light Flux ◽  
Cosmic Ray ◽  
High Energy ◽  
Wide Field ◽  
High Energy Astrophysics ◽  
Single Photon Counting ◽  
Photon Counting Mode

AbstractUVscope is an instrument, based on a multi-pixel photon detector, developed to support experimental activities for high-energy astrophysics and cosmic ray research. The instrument, working in single photon counting mode, is designed to directly measure light flux in the wavelengths range 300-650 nm. The instrument can be used in a wide field of applications where the knowledge of the nocturnal environmental luminosity is required. Currently, one UVscope instrument is allocated onto the external structure of the ASTRI-Horn Cherenkov telescope devoted to the gamma-ray astronomy at very high energies. Being co-aligned with the ASTRI-Horn camera axis, UVscope can measure the diffuse emission of the night sky background simultaneously with the ASTRI-Horn camera, without any interference with the main telescope data taking procedures. UVscope is properly calibrated and it is used as an independent reference instrument for test and diagnostic of the novel ASTRI-Horn telescope.

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