The Contribution to the Extragalactic Gamma‐Ray Background by Hadronic Interactions of Cosmic Rays Producing Extreme‐Ultraviolet Emission in Clusters of Galaxies

2005 ◽  
Vol 618 (2) ◽  
pp. 675-678 ◽  
Author(s):  
Ping‐Hung Kuo ◽  
Stuart Bowyer ◽  
Chorng‐Yuan Hwang
Keyword(s):  
Cosmic Rays ◽  
Gamma Ray ◽  
Extreme Ultraviolet ◽  
Clusters Of Galaxies ◽  
Ultraviolet Emission ◽  
Hadronic Interactions

scholarly journals Searches for IceCube neutrinos from blazar flares using correlations with gamma-ray lightcurves

2019 ◽  
Vol 207 ◽  
pp. 02007
Author(s):  
Christoph Raab ◽  
Juan Antonio Aguilar Sánchez
Keyword(s):  
Cosmic Rays ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Hadronic Interactions ◽  
Astrophysical Neutrinos ◽  
Gamma Ray Emission ◽  
Selection Of

Blazars have long been considered as accelerator candidates for cosmic rays. In such a scenario, hadronic interactions in the jet would produce neutrinos and gamma rays. Correlating the astrophysical neutrinos detected by IceCube with the gamma-ray emission from blazars could therefore help elucidate the origin of cosmic rays. In our method we focus on periods where blazars show an enhanced gamma-ray flux, as measured by Fermi-LAT, thereby reducing the background of the search. We present results for TXS 0506+056, using nearly 10 years of IceCube data and discuss them in the context of other recent analyses on this source. In addition, we give an outlook on applying this method in a stacked search for the combined emission from a selection of variable Fermi blazars.

scholarly journals Mergers and Non-Thermal Processes in Clusters

2005 ◽  
Vol 13 ◽  
pp. 291-295 ◽  
Author(s):  
Craig L. Sarazin
Keyword(s):  
Gamma Ray ◽  
Extreme Ultraviolet ◽  
Cosmological Parameters ◽  
Thermal Processes ◽  
Relativistic Electrons ◽  
Clusters Of Galaxies ◽  
X Ray ◽  
Cold Fronts ◽  
Electrons And Ions ◽  
Large Populations

AbstractClusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Mergers drive shocks in the intra-cluster gas which heat the intra-cluster gas. Mergers disrupt cluster cooling cores. Mergers produce large, temporary increases in the X-ray luminosities and temperatures of cluster; such merger boost may bias estimates of cosmological parameters from clusters. Chandra observations of the X-ray signatures of mergers, particularly “cold fronts,” will be discussed. X-ray observations of shocks can be used to determine the kinematics of the merger. As a result of particle acceleration in shocks and turbulent acceleration following mergers, clusters of galaxies should contain very large populations of relativistic electrons and ions. Observations and models for the radio, extreme ultraviolet, hard X-ray, and gamma-ray emission from non-thermal particles accelerated in these shocks are described.

COSMIC RAYS ABOVE THE 2ND KNEE FROM CLUSTERS OF GALAXIES

2009 ◽  
Vol 18 (10) ◽  
pp. 1609-1614 ◽  
Author(s):  
KOHTA MURASE ◽  
SUSUMU INOUE ◽  
KATSUAKI ASANO
Keyword(s):  
Cosmic Rays ◽  
Energy Range ◽  
Active Galactic Nuclei ◽  
Significant Contribution ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Cosmic Ray ◽  
High Energy ◽  
Clusters Of Galaxies

In clusters of galaxies, accretion and merger shocks are potential accelerators of high energy protons, as well as intracluster active galactic nuclei. We discuss the possibility that protons from cluster shocks make a significant contribution to the observed cosmic rays in the energy range between the second knee at ~1017.5 eV and the ankle at ~1018.5 eV. The accompanying neutrino and gamma-ray signals could be detectable by upcoming telescopes such as IceCube/KM3Net and CTA, providing a test of this scenario as well as a probe of cosmic-ray confinement properties in clusters.

scholarly journals NEW RESULTS FROM H.E.S.S. OBSERVATIONS OF GALAXY CLUSTERS

2009 ◽  
Vol 18 (10) ◽  
pp. 1627-1631 ◽  
Author(s):  
◽  
WILFRIED DOMAINKO ◽  
DALIBOR NEDBAL ◽  
JAMES A. HINTON ◽  
OLIVIER MARTINEAU-HUYNH
Keyword(s):  
Cosmic Rays ◽  
Galaxy Clusters ◽  
Gamma Rays ◽  
Large Scale ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Clusters Of Galaxies ◽  
X Ray ◽  
Model Predictions ◽  
The Universe

Clusters of galaxies are believed to contain a significant population of cosmic rays. From the radio and probably hard X-ray bands it is known that clusters are the spatially most extended emitters of non-thermal radiation in the Universe. Due to their content of cosmic rays, galaxy clusters are also potential sources of VHE (> 100 GeV) gamma rays. Recently, the massive, nearby cluster Abell 85 has been observed with the H.E.S.S. experiment in VHE gamma rays with a very deep exposure as part of an ongoing campaign. No significant gamma-ray signal has been found at the position of the cluster. The non-detection of this object with H.E.S.S. constrains the total energy of cosmic rays in this system. For a hard spectral index of the cosmic rays of -2.1 and if the cosmic-ray energy density follows the large scale gas density profile, the limit on the fraction of energy in these non-thermal particles with respect to the total thermal energy of the intra-cluster medium is 8% for this particular cluster. This value is at the lower bounds of model predictions.

A possible heating mechanism for the X-ray-emitting plasma within clusters of galaxies

2013 ◽  
Vol 79 (4) ◽  
pp. 447-450
Author(s):  
R. BINGHAM ◽  
B. J. KELLETT ◽  
U. DE ANGELIS ◽  
V. N. TSYTOVICH ◽  
P. K. SHUKLA
Keyword(s):  
Thermal Emission ◽  
Extreme Ultraviolet ◽  
Energy Content ◽  
Self Organization ◽  
Clusters Of Galaxies ◽  
Ultraviolet Emission ◽  
X Ray ◽  
Heating Mechanism ◽  
Hot Plasma ◽  
Thermal Energy Content

AbstractX-ray and extreme ultraviolet emission from galaxy clusters can be interpreted as thermal emission from a hot plasma gravitationally bound to the cluster and constituting a significant amount of the mass of the cluster. The origin of this plasma and its thermal energy content can be linked to the formation process through the theory of self-organization of these structures.

scholarly journals An interacting molecular cloud scenario for production of gamma-rays and neutrinos from MAGIC J1835-069, and MAGIC J1837-073

2021 ◽  
Vol 81 (5) ◽  
Author(s):  
Prabir Banik ◽  
Arunava Bhadra
Keyword(s):  
Cosmic Rays ◽  
Gamma Rays ◽  
Molecular Cloud ◽  
Gamma Ray ◽  
Galactic Plane ◽  
Cosmic Ray ◽  
Maximum Energy ◽  
Hadronic Interactions ◽  
Extended Sources ◽  
First Time

AbstractRecently the MAGIC telescope observed three TeV gamma-ray extended sources in the galactic plane in the neighborhood of radio SNR G24.7+0.6. Among them, the PWN HESS J1837-069 was detected earlier by the HESS observatory during its first galactic plane survey. The other two sources, MAGIC J1835-069 and MAGIC J1837-073 are detected for the first time at such high energies. Here we shall show that the observed gamma-rays from the SNR G24.7+0.6 and the HESS J1837-069 can be explained in terms of hadronic interactions of the PWN/SNR accelerated cosmic rays with the ambient matter. We shall further demonstrate that the observed gamma-rays from the MAGIC J1837-073 can be interpreted through hadronic interactions of runaway cosmic-rays from PWN HESS J1837-069 with the molecular cloud at the location of MAGIC J1837-073. No such association has been found between MAGIC J1835-069 and SNR G24.7+0.6 or PWN HESS J1837-069. We have examined the maximum energy attainable by cosmic-ray particles in the SNR G24.7+0.6/ PWN HESS J1837-069 and the possibility of their detection with future gamma-ray telescopes. The study of TeV neutrino emissions from the stated sources suggests that the HESS J1837-069 should be detected by IceCube Gen-2 neutrino telescope in a few years of observation.

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