D. Semikoz
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View article: A Self-Consistent Model of the Ultra High-Energy Gamma-Ray Emission of Pulsar Wind Nebulae: Insights from LHAASO and ATNF Catalogs
A Self-Consistent Model of the Ultra High-Energy Gamma-Ray Emission of Pulsar Wind Nebulae: Insights from LHAASO and ATNF Catalogs Open
Pulsar wind nebulae (PWNe) are the dominant Ultra-high-energy (UHE) gamma-ray sources in the LHAASO catalog suggesting that they are the dominant leptonic PeVatrons in our Galaxy. Despite this, still very little is known about their UHE ga…
View article: Ultrahigh-energy cosmic ray deflections in the coherent Galactic magnetic field
Ultrahigh-energy cosmic ray deflections in the coherent Galactic magnetic field Open
International audience
View article: Constraints on the diffuse flux of multi-PeV astrophysical neutrinos obtained with the Baikal Gigaton Volume Detector
Constraints on the diffuse flux of multi-PeV astrophysical neutrinos obtained with the Baikal Gigaton Volume Detector Open
International audience
View article: Displacement of ultra-high-energy cosmic ray source images by the intergalactic magnetic field: The cases of Cen A and M83
Displacement of ultra-high-energy cosmic ray source images by the intergalactic magnetic field: The cases of Cen A and M83 Open
The standard assumption about the influence of the turbulent intergalactic magnetic field (IGMF) on the images of ultra-high-energy cosmic rays (UHECR) sources is that the latter are formed in a random walk mode in the deflection angle. As…
View article: Probing the transition between Galactic and extragalactic cosmic rays with a multi-messenger approach
Probing the transition between Galactic and extragalactic cosmic rays with a multi-messenger approach Open
View article: Multimessenger emission from the microquasar V4641 Sgr
Multimessenger emission from the microquasar V4641 Sgr Open
View article: Shift of UHECR source images by the intergalactic magnetic field
Shift of UHECR source images by the intergalactic magnetic field Open
View article: Diffuse gamma-ray and neutrino emission from the Milky Way and the local knee in the cosmic ray spectrum
Diffuse gamma-ray and neutrino emission from the Milky Way and the local knee in the cosmic ray spectrum Open
The LHAASO observatory has recently measured details of the cosmic-ray (CR) spectrum in the knee region (1 -- 10 PeV) with unprecedented precision, including its average CR mass composition and the spectrum of the proton component. We use …
View article: Revision of conservative lower bound on intergalactic magnetic field from Fermi and Cherenkov telescope observations of extreme blazars
Revision of conservative lower bound on intergalactic magnetic field from Fermi and Cherenkov telescope observations of extreme blazars Open
Joint observations of extreme blazars with Fermi Large Area Telescope (LAT) and Imaging Atmospheric Cherenkov telescopes (IACT) have been previously used to derive lower bounds on intergalactic magnetic field (IGMF). We update these previo…
View article: Catalog of very-high-energy emitting active galactic nuclei at high Galactic latitudes
Catalog of very-high-energy emitting active galactic nuclei at high Galactic latitudes Open
Large number of Active Galactic Nuclei (AGN) producing Very-High-Energy (VHE) gamma-rays (energies above 100~GeV) has been revealed using observations with Imaging Atmospheric Cherenkov Telescopes (IACTs). However, our knowledge of the VHE…
View article: Cen A hotspot in Ultra-High-Energy Cosmic Rays illuminated by M83 or Cen A?
Cen A hotspot in Ultra-High-Energy Cosmic Rays illuminated by M83 or Cen A? Open
The standard assumption about the influence of the turbulent intergalactic magnetic field (IGMF) on the images of ultra-high-energy cosmic rays (UHECR) sources is that the latter are formed in a random walk mode in the deflection angle. As…
View article: Neutrino emission and corona heating induced by high-energy proton interactions in Seyfert galaxies
Neutrino emission and corona heating induced by high-energy proton interactions in Seyfert galaxies Open
Recent detection of very-high-energy neutrino emission from Seyfert type active galactic nuclei (AGN) provides a new insight into the physics of the AGN central engines. We notice that if high-energy protons responsible for neutrino emissi…
View article: Probing the Galactic Neutrino Flux at Neutrino Energies above 200 TeV with the Baikal Gigaton Volume Detector
Probing the Galactic Neutrino Flux at Neutrino Energies above 200 TeV with the Baikal Gigaton Volume Detector Open
Recent observations of the Galactic component of the high-energy neutrino flux, together with the detection of the diffuse Galactic gamma-ray emission up to sub-PeV energies, open new possibilities to study the acceleration and propagation…
View article: KM3-230213A: An Ultra-High Energy Neutrino from a Year-Long Astrophysical Transient
KM3-230213A: An Ultra-High Energy Neutrino from a Year-Long Astrophysical Transient Open
The Km3NET collaboration has recently reported the detection of a neutrino event with energy in excess of 100 PeV. This detection is in 2.5-3$σ$ tension with the upper limit on the neutrino flux at this energy imposed by IceCube and the Pi…
View article: The coherent magnetic field of the Milky Way halo, the Local Bubble, and the Fan region
The coherent magnetic field of the Milky Way halo, the Local Bubble, and the Fan region Open
Context . A recent catalogue of the Faraday rotation measures (RMs) of extragalactic sources, together with the synchrotron polarisation data from WMAP and Planck , provide us with a wealth of information on the magnetic fields of the Gala…
View article: Energy dependence of the knee in the cosmic-ray spectrum across the Milky Way
Energy dependence of the knee in the cosmic-ray spectrum across the Milky Way Open
The all-particle spectrum of cosmic rays measured at Earth has a knee-like feature around 4 PeV. A priori, it is not clear if this is a local feature specific to the Solar neighbourhood in the Milky Way, or if it is a generic property of t…
View article: Probing the Galactic neutrino flux at neutrino energies above 200 TeV with the Baikal Gigaton Volume Detector
Probing the Galactic neutrino flux at neutrino energies above 200 TeV with the Baikal Gigaton Volume Detector Open
Recent observations of the Galactic component of the high-energy neutrino flux, together with the detection of the diffuse Galactic gamma-ray emission up to sub-PeV energies, open new possibilities to study the acceleration and propagation…
View article: On the Contribution of Unresolved Pulsars to the Ultra-high-energy Galactic Diffuse Gamma-Ray Emission
On the Contribution of Unresolved Pulsars to the Ultra-high-energy Galactic Diffuse Gamma-Ray Emission Open
The ultra-high-energy (UHE) Galactic diffuse gamma-ray emission holds important information on the propagation of cosmic rays in the Galaxy. However, its measurements suffer from a contamination from unresolved sources whose contribution r…
View article: Multi-messenger signature of cosmic rays from the microquasar V4641 Sgr propagating along a Galactic Magnetic Field line
Multi-messenger signature of cosmic rays from the microquasar V4641 Sgr propagating along a Galactic Magnetic Field line Open
The recently detected extended, very-high-energy gamma-ray emission from the microquasar V4641 Sgr reveals a puzzling 200-parsec-long jet-like structure significantly misaligned with its radio jet. We propose that this gamma-ray structure …
View article: Neutrino signal from Cygnus region of the Milky Way
Neutrino signal from Cygnus region of the Milky Way Open
International audience
View article: Neutrino Signal from a Population of Seyfert Galaxies
Neutrino Signal from a Population of Seyfert Galaxies Open
IceCube Collaboration has previously reported evidence for a neutrino signal from a Seyfert galaxy NGC 1068. This may suggest that all Seyfert galaxies emit neutrinos. To test this hypothesis, we identify the best candidate neutrino source…
View article: The coherent magnetic field of the Milky Way halo, the Local Bubble, and the Fan region
The coherent magnetic field of the Milky Way halo, the Local Bubble, and the Fan region Open
C++ implementation of the coherent GMF model, presented in "The coherent magnetic field of the Milky Way halo, the Local Bubble, and the Fan region"
View article: Constraints on the intergalactic magnetic field from<i>Fermi</i>/LAT observations of the ‘pair echo’ of GRB 221009A
Constraints on the intergalactic magnetic field from<i>Fermi</i>/LAT observations of the ‘pair echo’ of GRB 221009A Open
Delayed ‘pair-echo’ signal from interactions of very-high-energy γ rays in the intergalactic medium can be used for the detection of the intergalactic magnetic field (IGMF). We used the data of the Fermi /LAT telescope coupled with LHAASO …
View article: Images of the Ultra-High Energy Cosmic Rays from Point Sources
Images of the Ultra-High Energy Cosmic Rays from Point Sources Open
Our latest paper investigates the effects of UHECR propagation in a turbulent intergalactic magnetic field in the small-angle scattering regime, specifically focusing on the non-trivial caustic-like pattern that arises with strong deviatio…
View article: Hadronic nature of high-energy emission from the Galactic ridge
Hadronic nature of high-energy emission from the Galactic ridge Open
We show that the IceCube observation of the Galactic neutrino-flux component confirms the hint of detection of neutrinos from the Galactic ridge (the inner part of the Milky Way disk within the Galactic longitude IlI < 30(degrees)), previo…
View article: High-energy neutrino-induced cascade from the direction of the flaring radio blazar TXS 0506 + 056 observed by Baikal-GVD in 2021
High-energy neutrino-induced cascade from the direction of the flaring radio blazar TXS 0506 + 056 observed by Baikal-GVD in 2021 Open
The existence of high-energy astrophysical neutrinos has been unambiguously demonstrated, but their sources remain elusive. IceCube reported an association of a 290-TeV neutrino with a gamma-ray flare of TXS 0506 + 056, an active galactic …
View article: Neutrino signal from Cygnus region of the Milky Way
Neutrino signal from Cygnus region of the Milky Way Open
Interactions of cosmic ray protons and nuclei in their sources and in the interstellar medium produce "hadronic" gamma-ray emission. Gamma-rays can also be of "leptonic" origin, i.e. originating from high-energy electrons accelerated toget…
View article: Limit on the intergalactic magnetic field from the ultrahigh-energy cosmic ray hotspot in the Perseus-Pisces region
Limit on the intergalactic magnetic field from the ultrahigh-energy cosmic ray hotspot in the Perseus-Pisces region Open
Telescope Array collaboration has reported an evidence for existence of a source of ultra-high-energy cosmic ray (UHECR) events in Perseus-Pisces supercluster. We show that the mere existence of such a source imposes an upper bound on the …
View article: Search for directional associations between baikal gigaton volume detector neutrino-induced cascades and high-energy astrophysical sources
Search for directional associations between baikal gigaton volume detector neutrino-induced cascades and high-energy astrophysical sources Open
Baikal-GVD has recently published its first measurement of the diffuse astrophysical neutrino flux, performed using high-energy cascade-like events. We further explore the Baikal-GVD cascade data set collected in 2018–2022, with the aim to…
View article: Baikal-GVD Astrophysical Neutrino Candidate near the Blazar TXS~0506+056
Baikal-GVD Astrophysical Neutrino Candidate near the Blazar TXS~0506+056 Open
We report on the observation of a rare neutrino event detected by Baikal-GVD in April 2021. The event GVD210418CA is the highest-energy cascade observed by Baikal-GVD so far from the direction below the horizon. The estimated cascade energ…