J. Dyks
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View article: Plasma-astrophysical Mechanism as a Probe to Unravel the Nature of Polarized Pulsar Radio Emission
Plasma-astrophysical Mechanism as a Probe to Unravel the Nature of Polarized Pulsar Radio Emission Open
Despite numerous theories on pulsars, a consensus on a reliable emission mechanism explaining their diverse observational characteristics remains elusive. In this paper, we couple the plasma process of stimulated Raman scattering (SRS) wit…
View article: Rapid Rotation of Polarization Orientations in PSR B1919+21’s Single Pulses: Implications on Pulsar’s Magnetospheric Dynamics
Rapid Rotation of Polarization Orientations in PSR B1919+21’s Single Pulses: Implications on Pulsar’s Magnetospheric Dynamics Open
We analyze and model rapid rotations of polarization orientations in PSR B1919+21’s single pulses based on Five-hundred-meter Aperture Spherical radio Telescope observation data. In more than one-third of B1919+21’s single pulses, the pola…
View article: Rapid Rotation of Polarization Orientations in PSR B1919+21's Single Pulses: Implications On Pulsar's Magnetospheric Dynamics
Rapid Rotation of Polarization Orientations in PSR B1919+21's Single Pulses: Implications On Pulsar's Magnetospheric Dynamics Open
We analyze and model rapid rotations of polarization orientations in PSR B1919+21's single pulses based on Five-hundred-meter Aperture Spherical radio Telescope observation data. In more than one-third of B1919+21's single pulses, the pola…
View article: PSR B0943+10: Mode Switch, Polar Cap Geometry, and Orthogonally Polarized Radiation
PSR B0943+10: Mode Switch, Polar Cap Geometry, and Orthogonally Polarized Radiation Open
As one of the paradigm examples to probe into pulsar magnetospheric dynamics, PSR B0943+10 (J0946+0951) manifests representatively, showing a mode switch, orthogonal polarization, and subpulse drifting, frequently studied below 600 MHz. He…
View article: PSR B0943+10: Mode Switch, Polar Cap Geometry, and Orthogonally Polarized Radiation
PSR B0943+10: Mode Switch, Polar Cap Geometry, and Orthogonally Polarized Radiation Open
As one of the paradigm examples to probe into pulsar magnetospheric dynamics, PSR B0943+10 (J0946+0951) manifests representatively, showing mode switch, orthogonal polarization and subpulse drifting, frequently studied below 600 MHz. Here …
View article: Evidence for scattering of curvature radiation in radio pulsar profiles
Evidence for scattering of curvature radiation in radio pulsar profiles Open
Radio pulsars exhibit several unexplained phenomena, in particular the average pulse profiles with the apparent core-cone structure and interesting frequency evolution. I show that they can be interpreted through essential geometric proper…
View article: Evidence for scattering of curvature radiation in radio pulsar profiles
Evidence for scattering of curvature radiation in radio pulsar profiles Open
Radio pulsars exhibit several unexplained phenomena, in particular the average pulse profiles with the apparent core-cone structure and interesting frequency evolution. I show that they can be interpreted through essential geometric proper…
View article: A new model for nulling and moding in radio pulsars
A new model for nulling and moding in radio pulsars Open
Single pulse behaviour of radio pulsars is usually interpreted in terms of the ExB drift of a radio beam. It is shown that antisymmetric arrangement of the radio-bright zones can produce several types of observed single pulse phenomena: th…
View article: Geometry of radio pulsar signals: The origin of pulsation modes and nulling
Geometry of radio pulsar signals: The origin of pulsation modes and nulling Open
Radio pulsars exhibit an enormous diversity of single pulse behaviour that involves sudden changes in pulsation mode and nulling occurring on timescales of tens or hundreds of spin periods. The pulsations appear both chaotic and quasi-regu…
View article: The polarisation of the drifting sub-pulses from PSR B1919+21
The polarisation of the drifting sub-pulses from PSR B1919+21 Open
Aims. We aim to expand our understanding of radio wave emission and propagation in the pulsar magnetosphere by studying the polarisation of drifting sub-pulses in highly sensitive observations of PSR B1919+21 recorded at the Arecibo Observ…
View article: The polarization of the drifting sub-pulses from PSR B1919+21
The polarization of the drifting sub-pulses from PSR B1919+21 Open
Aims. We aim to expand our understanding of radio wave emission and propagation in the pulsar magnetosphere by studying the polarization of drifting sub-pulses in highly sensitive observations of PSR~B1919+21 recorded at the Arecibo Observ…
View article: Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase
Searching for TeV Gamma-Ray Emission from SGR 1935+2154 during Its 2020 X-Ray and Radio Bursting Phase Open
Magnetar hyperflares are the most plausible explanation for fast radio bursts (FRBs)—enigmatic powerful radio pulses with durations of several milliseconds and high brightness temperatures. The first observational evidence for this scenari…
View article: Geometry of radio pulsar signals: The origin of pulsation modes and nulling
Geometry of radio pulsar signals: The origin of pulsation modes and nulling Open
Radio pulsars exhibit an enormous diversity of single pulse behaviour that involves sudden changes in pulsation mode and nulling occurring on timescales of tens or hundreds of spin periods. The pulsations appear both chaotic and quasi-regu…
View article: TeV Emission of Galactic Plane Sources with HAWC and H.E.S.S.
TeV Emission of Galactic Plane Sources with HAWC and H.E.S.S. Open
The High Altitude Water Cherenkov (HAWC) observatory and the High Energy Stereoscopic System (H.E.S.S.) are two leading instruments in the ground-based very-high-energy γ -ray domain. HAWC employs the water Cherenkov detection (WCD) techni…
View article: Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow
Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow Open
An intrinsic gamma-ray burst afterglow Long gamma-ray bursts (GRBs) are emitted by relativistic jets generated during the collapse of a massive star in a distant galaxy. The GRB itself lasts only a few seconds but is followed by an aftergl…
View article: Search for dark matter annihilation in the Wolf-Lundmark-Melotte dwarf irregular galaxy with H.E.S.S.
Search for dark matter annihilation in the Wolf-Lundmark-Melotte dwarf irregular galaxy with H.E.S.S. Open
We search for an indirect signal of dark matter through very high-energy γ rays from the Wolf-Lundmark-Melotte (WLM) dwarf irregular galaxy. The pair annihilation of dark matter particles would produce Standard Model particles in the final…
View article: H.E.S.S. and MAGIC observations of a sudden cessation of a very-high-energy γ-ray flare in PKS 1510−089 in May 2016
H.E.S.S. and MAGIC observations of a sudden cessation of a very-high-energy γ-ray flare in PKS 1510−089 in May 2016 Open
The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behaviour and it is one of only a few FSRQs detected in very-high-energy (VHE, E>100 GeV) gamma rays. The VHE gamma -ray observations with H.E.S.S.…
View article: LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV Open
Context. Supernova remnants (SNRs) are commonly thought to be the dominant sources of Galactic cosmic rays up to the knee of the cosmic-ray spectrum at a few PeV. Imaging Atmospheric Cherenkov Telescopes have revealed young SNRs as very-hi…
View article: Circular polarization in radio pulsar PSR B1451−68: coherent mode transitions and intrabeam interference
Circular polarization in radio pulsar PSR B1451−68: coherent mode transitions and intrabeam interference Open
The radio emission of pulsar B1451−68 contains two polarization modes of similar strength, which produce two clear orthogonal polarization angle tracks. When viewed on a Poincaré sphere, the emission is composed of two flux patches that ro…
View article: An extreme particle accelerator in the Galactic plane: HESSJ1826-130
An extreme particle accelerator in the Galactic plane: HESSJ1826-130 Open
The unidentified very-high-energy (VHE; E>0.1 TeV)γ-ray source, HESS J1826−130, was discovered with the High Energy Stereoscopic System(HESS) in the Galactic plane. The analysis of 215 h of HESS data has revealed a steadyγ-ray flux from HE…
View article: Search for dark matter signals towards a selection of recently detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S.
Search for dark matter signals towards a selection of recently detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S. Open
Dwarf spheroidal galaxy satellites of the Milky Way are prime targets for indirect detection of dark matter with gamma rays due to their proximity, high dark matter content, and absence of nonthermal emission processes. Recently, the Dark …
View article: Resolving acceleration to very high energies along the jet of Centaurus A
Resolving acceleration to very high energies along the jet of Centaurus A Open
The nearby radio galaxy Centaurus A belongs to a class of active galaxies that are luminous at radio wavelengths. Most show collimated relativistic outflows known as jets, which extend over hundreds of thousands of parsecs for the most pow…
View article: A new model for nulling and moding in radio pulsars
A new model for nulling and moding in radio pulsars Open
Single pulse behaviour of radio pulsars is usually interpreted in terms of the E × B drift of a radio beam. It is shown that antisymmetric arrangement of the radio-bright zones can produce several types of observed single pulse phenomena: …
View article: Probing the Magnetic Field in the GW170817 Outflow Using H.E.S.S. Observations
Probing the Magnetic Field in the GW170817 Outflow Using H.E.S.S. Observations Open
The detection of the first electromagnetic counterpart to the binary neutron star (BNS) merger remnant GW170817 established the connection between short γ -ray bursts and BNS mergers. It also confirmed the forging of heavy elements in the …
View article: Artefacts of circumpolar cartography in radio pulsar polarization
Artefacts of circumpolar cartography in radio pulsar polarization Open
Single-pulse data on radio pulsar polarization are traditionally presented in the form of two-dimensional grey-scale patterns with the pulse longitude and polarization angle (PA) on the horizontal and vertical axis, respectively. Such diag…
View article: Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance
Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance Open
We report on the detection of very high energy (VHE; E > 100 GeV) γ-ray emission from the BL Lac objects KUV 00311−1938 and PKS 1440−389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or prec…
View article: Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies
Simultaneous observations of the blazar PKS 2155−304 from ultra-violet to TeV energies Open
Here we report the results of the first ever contemporaneous multi-wavelength observation campaign on the BL Lac object PKS 2155−304 involving Swift , NuSTAR , Fermi -LAT, and H.E.S.S. The use of these instruments allows us to cover a broa…
View article: H.E.S.S. and <i>Fermi</i>-LAT observations of PSR B1259–63/LS 2883 during its 2014 and 2017 periastron passages
H.E.S.S. and <i>Fermi</i>-LAT observations of PSR B1259–63/LS 2883 during its 2014 and 2017 periastron passages Open
Context. PSR B1259–63/LS 2883 is a gamma-ray binary system consisting of a pulsar in an eccentric orbit around a bright Oe stellar-type companion star that features a dense circumstellar disc. The bright broad-band emission observed at pha…
View article: H.E.S.S. detection of very high-energy <i>γ</i>-ray emission from the quasar PKS 0736+017
H.E.S.S. detection of very high-energy <i>γ</i>-ray emission from the quasar PKS 0736+017 Open
Context. Flat-spectrum radio-quasars (FSRQs) are rarely detected at very high energies ( E ≥ 100 GeV) due to their low-frequency-peaked spectral energy distributions. At present, only six FSRQs are known to emit very high-energy (VHE) phot…