منابع مشابه
Powerful GeV emission from a γ-ray-burst shock wave scattering stellar photons
The γ-ray bursts (GRBs) of long duration are likely connected to the death of massive stars. The γ-ray emission is believed to come from energy released internally in a flow that moves at ultrarelativistic speed. The fast flow drives a shock wave into the external medium leading to the afterglow emission. Most massive stars form in dense clusters, their high luminosity producing a very dense ra...
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We present a new prediction of GeV γ-ray emission from radio lobes of young AGN jets. In the previous work of Kino et al. (2007), MeV γ-ray bremsstrahlung emission was predicted from young cocoons/radio-lobes in the regime of no coolings. In this study, we include cooling effects of bremsstrahlung emission and adiabatic loss. With the initial conditions determined by observed young radio lobes,...
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The AGN 1ES1959+650 has been observed with the MAGIC telescope in September and October 2004, at the end of the commissioning phase. The MAGIC Telescope is currently the IACT with the lowest energy threshold, which is well suited for observations of weak γ-ray sources with soft spectra, like AGNs in a quiescent state. During the first observations by MAGIC, 1ES1959+650 was in a low state of act...
متن کاملNon-photonic emission from γ-ray bursts
γ−ray bursts (GRBs) are likely sources of ultra-high energy, > 1019 eV, protons and high energy, > 1 TeV, neutrinos. Large volume detectors of ultra high energy cosmic rays (UHECRs) and high energy neutrinos, which are already operating and are being expanded, may allow to test in the coming few years the predictions of the GRB model for high energy proton and neutrino production. Detection of ...
متن کاملHigh-energy γ-ray emission from gamma-ray bursts
GRBs are nowadays a rather well understood phenomenon in the soft (KeV-MeV) γ-ray energy band, while only a few GRBs have been observed at high photon energies (Eγ ∼ 1 GeV). It is also widely recognized that GRBs accelerate protons to relativistic energies and that dense media are often present nearby the sources. Within this framework and by further adopting Totani’s suggestion that GRB events...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2020
ISSN: 1538-4357
DOI: 10.3847/1538-4357/aba043