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Cited by 493

The DOI matches its Crossref record; 21 of the 21 references it cites were found in a registry or an index.

TeV gamma rays from BL Lac objects due to synchrotron radiation of extremely high energy protons

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Aharonian, F.A.·2000·New Astronomy
DOI 10.1016/s1384-1076(00)00039-7
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Abstract

Abstract One of remarkable features of the gamma-ray blazar Markarian 501 is the reported shape of the TeV spectrum, which during strong flares of the source remains essentially stable despite dramatic variations of the absolute γ-ray flux. I argue that this unusual behavior of the source could be explained assuming that the TeV emission is a result of synchrotron radiation of extremely high energy (E≥1019 eV) protons in highly magnetized (B∼30–100 G) compact regions of the jet with typical size R∼1015–1016 cm and Doppler factor δj≃10–30. It is shown that if protons are accelerated at the maximum possible rate, i.e. tacc=η(rg/c) with so-called gyro-factor η∼1, the synchrotron cooling of protons could not only dominate over other radiative and non-radiative losses, but could also provide good fits (within uncertainties introduced by extragalactic γ-ray extinction) to the γ-radiation of two firmly established TeV blazars — Markarian 501 and Markarian 421. Remarkably, if the proton acceleration takes place in the regime dominated by synchrotron losses, the spectral shape of the Doppler-boosted γ-radiation in the observer's frame is determined essentially by the self-regulated “synchrotron cutoff” at ϵ 0 ≃0.3 δ j η −1 TeV. The hypothesis of the proton-synchrotron origin of TeV flares of BL Lac objects inevitably implies that the energy contained in the form of magnetic field in the γ-ray emitting region exceeds the kinetic energy of accelerated protons.

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Metadata

Authors
Aharonian, F. A.
Venue
New Astronomy
Publisher
Elsevier BV
Published
2000-11
Volume
5
Issue
7
Pages
377-395
ISSN
1384-1076 (ISSN-L)
DOI
10.1016/s1384-1076(00)00039-7
OpenAlex
W2090715388
Cited by
493
References
21
FWCI
7.28
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: TeV gamma rays from BL Lac objects due to synchrotron radiation of extremely high energy protons. https://app.cochat.ai/papers/10.1016/s1384-1076(00)00039-7
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Aharonian, F. A. (2000). TeV gamma rays from BL Lac objects due to synchrotron radiation of extremely high energy protons. New Astronomy. https://doi.org/10.1016/s1384-1076(00)00039-7

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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