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The Proton Blazar
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Considering shock-accelerated protons in addition to electrons in a synchrotron radio jet naturally produces the observed X- through gamma ray continuum emission of flat-spectrum radio-loud AGN, whereas the corresponding shock-accelerated electrons produce the infrared through optical continuum. All of these emission components are rapidly variable on short time scales which can be accounted for by a common origin of the blazar emission in a relativistic sub-parsec scale jet. Moreover, neutrino fluxes are estimated which may be observable with the HiRes experiment and the impact on the ISM of the host galaxy of neutrons escaping from the nuclear jet is investigated.
Forward citations
Cited by 10 Pith papers
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Fermi-Large Area Telescope Detection of Very High Energy (>100 GeV) Emission from Compton-Dominated Blazars
Systematic Fermi-LAT search detects VHE emission from 14 Compton-dominated blazars (4 new at >5σ) and constrains the emitting region to >1.1–1.4 BLR radii.
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From Equipartition to Curvature: The Spectral Evolution of 4FGL Blazars
One-zone leptonic fits to 100 Fermi blazars indicate the BL Lac blazar sequence is driven by equipartition-linked electron density and peak energy, while FSRQs deviate and curvature trends favor soft-turbulence stocha...
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Searching for Internal Absorption Signatures in High-Redshift Blazars
Fermi-LAT data for nine z≥3 FSRQs show no significant internal BLR absorption except a 1.7σ hint in 4FGL J0733.8+0455, whose gamma-ray emission region is constrained to d/R_BLR≥0.93.
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X-ray Polarization of the High-Synchrotron-Peaked BL Lac H 1426+428
H 1426+428 shows 20.6% ± 2.9% X-ray polarization at 7.1 sigma in July 2024, while the May 2024 observation yields only an upper limit of 19.5%.
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Detectability of Polarized Gamma-ray Emission from Blazar Flares with COSI
Estimates based on 17 years of Fermi LAT data indicate COSI may detect MeV polarization in a small number of blazar flares, with flat-spectrum radio quasars as the top targets.
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Leptohadronic Multimessenger Modeling of Two High-redshift (z $>$ 1) Neutrino Emission Blazar Candidates
Two z>1 FSRQ blazars that point at IceCube neutrino events are modeled as efficient PeV neutrino emitters, with muon neutrino detection probabilities of about 2% and 0.8%.
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Location of a Sample of GeV and Optical Outbursts in the Jets of Blazars
For 47 GeV-optical outbursts in 10 blazars, the measured gamma-to-optical energy ratios map to emission regions beyond the broad line region in every case.
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Spectral analysis of the blazars Markarian 421 and Markarian 501 with the HAWC Gamma-Ray Observatory
HAWC observations show the intrinsic spectrum of Mrk 421 requires an exponential cutoff near 5 TeV, while Mrk 501 is consistent with a power law up to 100 TeV.
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Particle Astrophysics with High and Ultrahigh Energy Neutrinos
Recent high and ultrahigh energy neutrino detections open a new observational window to the universe by revealing sources and processes inaccessible via photons.
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High-Synchrotron-Peaked BL Lacs as Multi-Messenger Sources: Connecting Ultra-High-Energy Cosmic Rays and Neutrinos
Review assessing HSP BL Lacs as UHECR and neutrino sources, noting strains from baryonic loading, heavy-nuclei preference in Auger data, and isotropy mismatch with beamed sources.
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