L. Dirson
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View article: Phenomenological modelling of the Crab Nebula’s broadband energy spectrum and its apparent extension
Phenomenological modelling of the Crab Nebula’s broadband energy spectrum and its apparent extension Open
Context. The Crab Nebula emits exceptionally bright non-thermal radiation across the entire wavelength range from the radio to the most energetic photons. So far, the underlying physical model of a relativistic wind from the pulsar termina…
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: 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: 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: 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: 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: 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…
View article: Resolving the Crab pulsar wind nebula at teraelectronvolt energies
Resolving the Crab pulsar wind nebula at teraelectronvolt energies Open
The Crab nebula is one of the most studied cosmic particle accelerators, shining brightly across the entire electromagnetic spectrum up to very high-energy gamma rays. It is known from radio to gamma-ray observations that the nebula is pow…
View article: H.E.S.S. and<i>Suzaku</i>observations of the Vela X pulsar wind nebula
H.E.S.S. and<i>Suzaku</i>observations of the Vela X pulsar wind nebula Open
Context. Pulsar wind nebulae (PWNe) represent the most prominent population of Galactic very-high-energy gamma-ray sources and are thought to be an efficient source of leptonic cosmic rays. Vela X is a nearby middle-aged PWN, which shows b…
View article: H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830–211
H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830–211 Open
PKS 1830–211 is a known macrolensed quasar located at a redshift of z = 2.5. Its high-energy gamma-ray emission has been detected with the Fermi-Large Area Telescope (LAT) instrument and evidence for lensing was obtained by several authors…
View article: Particle transport within the pulsar wind nebula HESS J1825–137
Particle transport within the pulsar wind nebula HESS J1825–137 Open
Context. We present a detailed view of the pulsar wind nebula (PWN) HESS J1825–137. We aim to constrain the mechanisms dominating the particle transport within the nebula, accounting for its anomalously large size and spectral characterist…
View article: VHE γ-ray discovery and multi-wavelength study of the blazar 1ES 2322-409
VHE γ-ray discovery and multi-wavelength study of the blazar 1ES 2322-409 Open
A hotspot at a position compatible with the BL Lac object 1ES 2322−409 was serendipitously detected with H.E.S.S. during observations performed in 2004 and 2006 on the blazar PKS 2316−423. Additional data on 1ES 2322−409 were taken in 2011…
View article: Search for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-Ray Line Signals from Dark Matter Annihilations in the Inner Galactic Halo from 10 Years of Observations with H.E.S.S.
Search for -Ray Line Signals from Dark Matter Annihilations in the Inner Galactic Halo from 10 Years of Observations with H.E.S.S. Open
Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy γ rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and pro…
View article: The H.E.S.S. Galactic plane survey
The H.E.S.S. Galactic plane survey Open
We present the results of the most comprehensive survey of the Galactic plane in very high-energy (VHE) γ -rays, including a public release of Galactic sky maps, a catalog of VHE sources, and the discovery of 16 new sources of VHE γ -rays.…
View article: H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354
H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354 Open
PKS 0625−354 (z = 0.055) was observed with the four High Energy Stereoscopic System (H.E.S.S.) telescopes in 2012 during 5.5 h. The source was detected above an energy threshold of 200 GeV at a significance level of 6.1σ. No significant va…
View article: Detection of variable VHE <i>γ</i>-ray emission from the extra-galactic <i>γ</i>-ray binary LMC P3
Detection of variable VHE <i>γ</i>-ray emission from the extra-galactic <i>γ</i>-ray binary LMC P3 Open
Context. Recently, the high-energy (HE, 0.1–100 GeV) γ -ray emission from the object LMC P3 in the Large Magellanic Cloud (LMC) has been discovered to be modulated with a 10.3-day period, making it the first extra-galactic γ -ray binary. A…
View article: HESS J1741−302: a hidden accelerator in the Galactic plane
HESS J1741−302: a hidden accelerator in the Galactic plane Open
The H.E.S.S. Collaboration has discovered a new very high energy (VHE, E > 0.1 TeV) γ -ray source, HESS J1741−302, located in the Galactic plane. Despite several attempts to constrain its nature, no plausible counterpart has been found so …
View article: TeV Gamma-Ray Observations of the Binary Neutron Star Merger GW170817 with H.E.S.S.
TeV Gamma-Ray Observations of the Binary Neutron Star Merger GW170817 with H.E.S.S. Open
We search for high-energy gamma-ray emission from the binary neutron star merger GW170817 with the H.E.S.S. Imaging Air Cherenkov Telescopes. The observations presented here have been obtained starting only 5.3 hr after GW170817. The H.E.S…
View article: Contributions of the High Energy Stereoscopic System (H.E.S.S.) to the 35th International Cosmic Ray Conference (ICRC), Busan, Korea
Contributions of the High Energy Stereoscopic System (H.E.S.S.) to the 35th International Cosmic Ray Conference (ICRC), Busan, Korea Open
Index of H.E.S.S. conference proceedings to the 35th ICRC, Busan, Korea
View article: Systematic search for very-high-energy gamma-rayemission from bow shocks of runaway stars
Systematic search for very-high-energy gamma-rayemission from bow shocks of runaway stars Open
Context. Runaway stars form bow shocks by ploughing through the interstellar medium at supersonic speeds and are promising sources of non-thermal emission of photons. One of these objects has been found to emit non-thermal radiation in the…