Publications by Andrii Neronov

Intergalactic magnetism in a γ -ray beam as a model of Porphyrion

We estimate the magnetic field in the jets of the recently discovered 7 Mpc long Porphyrion system. We used nondetection of the system in gamma-rays to derive a lower bound on the co-moving magnetic field strength at the level of 10 nG (comoving). This val ...

2025

Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. Geminga is the third gamma-ray pulsar firmly detected by imaging atmospheric Cherenkov telescopes (IACTs) after the Crab and the Vela pulsars. Most of its emission is expected at tens of giga-electronvolts, and, out of the planned telescopes of th ...

2025

GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

GRB 221009A is the brightest gamma-ray burst (GRB) observed to date. Extensive observations of its afterglow emission across the electromagnetic spectrum were performed, providing the first strong evidence of a jet with a nontrivial angular structure in a ...

2025

Multimessenger signature of cosmic rays from the microquasar V4641 Sgr propagating along a Galactic magnetic field line

Andrii Neronov

The recently detected extended very-high-energy 𝛾-ray emission from the microquasar V4641 Sgr reveals a puzzling 200 parsec-long jetlike structure significantly misaligned with its radio jet. We propose that this 𝛾-ray structure is produced by high-energy ...

American Physical Society (APS)2025

Detection of RS Oph with LST-1 and modelling of its HE/VHE gamma-ray emission

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

Context. The recurrent nova RS Ophiuchi (RS Oph) underwent a thermonuclear eruption in August 2021. In this event, RS Oph was detected by the High Energy Stereoscopic System (H.E.S.S.), the Major Atmospheric Gamma Imaging Cherenkov (MAGIC), and the first L ...

2025

Constraint on magnetized galactic outflows from LOFAR rotation measure data

Andrii Neronov

Outflows from galaxies that are driven by active galactic nuclei and star formation activity spread magnetic fields into the intergalactic medium. The importance of this process can be assessed using cosmological magnetohydrodynamical numerical modeling of ...

2024

Performance of the MAGIC stellar intensity interferometer and expansion to MAGIC + CTAO-LST1 stellar intensity interferometer

Andrii Neronov, Oleg Kalashev, Volodymyr Savchenko

A new generation of optical intensity interferometers are emerging in recent years taking advantage of the existing infrastructure of Imaging Atmospheric Cherenkov Telescopes (IACTs). The MAGIC SII (Stellar Intensity Interferometer) in La Palma, Spain, has ...

SPIE2024

The second data release from the European Pulsar Timing Array IV. Implications for massive black holes, dark matter, and the early Universe

Andrii Neronov, Jia Liu, Ke Liu, Jun Wang, Jongmoon Jang

The European Pulsar Timing Array (EPTA) and Indian Pulsar Timing Array (InPTA) collaborations have measured a low-frequency common signal in the combination of their second and first data releases, respectively, with the correlation properties of a gravita ...

EDP SCIENCES S A2024

Energy dependence of the knee in the cosmic-ray spectrum across the Milky Way

Andrii Neronov

The all-particle spectrum of cosmic rays measured at Earth has a kneelike feature around 4 PeV. A priori, it is not clear if this is a local feature specific to the Solar neighborhood in the Milky Way or if it is a generic property of the Galactic cosmic-r ...

AMER PHYSICAL SOC2024

Constraints on the intergalactic magnetic field from Fermi/LAT observations of the 'pair echo' of GRB 221009A

Andrii Neronov

Delayed 'pair-echo' signal from interactions of very-high-energy gamma 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 observatory me ...

Edp Sciences S A2024