Publications (53)
A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +244
Microquasars are potential -ray emitters. Indications of transient episodes of -ray emission were recently reported in at least two systems: Cyg X-1 and Cyg X-3. The identi…
Detection of very-high-energy γ-ray emission from the colliding wind binary η Car with H.E.S.S
H. E. S. S. Collaboration, H. Abdalla, R. Adam +231
Aims. Colliding wind binary systems have long been suspected to be high-energy (HE; 100 MeV < E < 100 GeV) γ-ray emitters. η Car is the most prominent member of this object class…
Constraints on particle acceleration in SS433/W50 from MAGIC and H.E.S.S. observations
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +408
The large jet kinetic power and non-thermal processes occurring in the microquasar SS 433 make this source a good candidate for a very high-energy (VHE) gamma-ray emitter. Gamma-ra…
The supernova remnant W49B as seen with H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +253
The supernova remnant (SNR) W49B originated from a core-collapse supernova that occurred between one and four thousand years ago, and subsequently evolved into a mixed-morphology r…
Contributions of the High Energy Stereoscopic System (H.E.S.S.) to the 35th International Cosmic Ray Conference (ICRC), Busan, Korea
H. E. S. S. Collaboration, :, H. Abdalla +256
Index of H.E.S.S. conference proceedings to the 35th ICRC, Busan, Korea
The -ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +249
Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV-100 TeV) -ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a f…
Resolving acceleration to very high energies along the Jet of Centaurus A
The H. E. S. S. Collaboration, :, H. Abdalla +224
The nearby radio galaxy Centaurus A belongs to a class of Active Galaxies that are very luminous at radio wavelengths. The majority of these galaxies show collimated relativistic o…
Search for dark matter annihilation in the dwarf irregular galaxy WLM with H.E.S.S
H. E. S. S. Collaboration, H. Abdallah, R. Adam +232
We search for an indirect signal of dark matter through very high-energy gamma rays from the Wolf-Lundmark-Melotte (WLM) dwarf irregular galaxy. The pair annihilation of dark matte…
Deeper H.E.S.S. observations of Vela Junior (RX J0852.04622): Morphology studies and resolved spectroscopy
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +260
Aims. We study gamma-ray emission from the shell-type supernova remnant (SNR) RX J0852.04622 to better characterize its spectral properties and its distribution over the SNR. Me…
CTA Contributions to the 34th International Cosmic Ray Conference (ICRC2015)
The CTA Consortium, :, A. Abchiche +1305
List of contributions from the CTA Consortium presented at the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands.
The population of TeV pulsar wind nebulae in the H.E.S.S. Galactic Plane Survey
H. E. S. S. Collaboration, :, H. Abdalla +255
The nine-year H.E.S.S. Galactic Plane Survey (HGPS) yielded the most uniform observation scan of the inner Milky Way in the TeV gamma-ray band to date. The sky maps and source cata…
Search for dark matter signals towards a selection of recently-detected DES dwarf galaxy satellites of the Milky Way with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdallah +227
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 abs…
Particle Transport within the Pulsar Wind Nebula HESS J1825-137
H. E. S. S. Collaboration, H. Abdalla, F. Aharonian +225
Aims: 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…
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: the case of PKS 2155-304 and PG 1553+113
H. E. S. S. Collaboration, :, H. Abdalla +332
The addition of a 28 m Cherenkov telescope (CT5) to the H.E.S.S. array extended the experiment's sensitivity to lower energies. The lowest energy threshold is obtained using monosc…
First Ground-based Measurement of Sub-20 GeV to 100 GeV -rays from the Vela Pulsar with H.E.S.S. II
H. E. S. S. Collaboration, H. Abdalla, F. Aharonian +230
We report on the measurement and investigation of pulsed high-energy -ray emission from the Vela pulsar, PSR B083345, based on 40.3 hours of observations with the largest te…
Very high energy -ray emission from two blazars of unknown redshift and upper limits on their distance
H. E. S. S. Collaboration, H. Abdalla, R. Adam +225
We report on the detection of very-high-energy (VHE; GeV) -ray emission from the BL Lac objects KUV 00311-1938 and PKS 1440-389 with the High Energy Stereoscopic Syst…
A search for new supernova remnant shells in the Galactic plane with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdalla +263
A search for new supernova remnants (SNRs) has been conducted using TeV gamma-ray data from the H.E.S.S. Galactic plane survey. As an identification criterion, shell morphologies t…
Extended VHE gamma-ray emission towards SGR1806-20, LBV1806-20, and stellar cluster Cl*1806-20
H. Abdalla, A. Abramowski, F. Aharonian +241
Using the High Energy Spectroscopic System (H.E.S.S.) telescopes we have discovered a steady and extended very high-energy (VHE) gamma-ray source towards the luminous blue variable…
The "shook up" galaxy NGC 3079: the complex interplay between HI, activity and environment
N. Shafi, T. A. Oosterloo, R. Morganti +2
We present deep neutral hydrogen (HI) observations of the starburst/Seyfert galaxy NGC 3079 and its environment, obtained with the Westerbork Synthesis Radio Telescope. Our observa…
Resolving the Crab pulsar wind nebula at teraelectronvolt energies
H. E. S. S. Collaboration, H. Abdalla, F. Aharonian +221
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…
Detection of variable VHE gamma-ray emission from the extra-galactic gamma-ray binary LMC P3
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +253
Context. Recently, the high-energy (HE, 0.1-100 GeV) -ray emission from the object LMC P3 in the Large Magellanic Cloud (LMC) has been discovered to be modulated with a 10.3-da…
TeV emission of Galactic plane sources with HAWC and H.E.S.S
H. Abdalla, F. Aharonian, F. Ait Benkhali +318
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 gamma-ray d…
A very-high-energy component deep in the Gamma-ray Burst afterglow
H. Abdalla R. Adam F. Aharonian F. Ait Benkhali E. O. Anguener M. Arakawa, C. Arcaro, C. Armand +219
Gamma-ray bursts (GRBs) are brief flashes of gamma rays, considered to be the most energetic explosive phenomena in the Universe. The emission from GRBs comprises a short (typicall…
Observation of a sudden cessation of a very-high-energy gamma-ray flare in PKS 1510-089 with H.E.S.S. and MAGIC in May 2016
H. E. S. S. Collaboration, H. Abdalla, R. Adam +430
The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behavior, and is one of only a few FSRQs detected at very high energy (VHE, GeV…
Contributions of the Cherenkov Telescope Array (CTA) to the 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2016)
The CTA Consortium, :, A. Abchiche +1387
List of contributions from the Cherenkov Telescope Array (CTA) Consortium presented at the 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2016), July 11-15,…
The Hot and Cold Outflows of NGC 3079
N. Shafi, R. Morganti, T. Oosterloo +1
Very deep neutral hydrogen (HI) observations of the edge-on spiral galaxy NGC 3079 with the Westerbork Synthesis Radio Telescope (WSRT) are presented. The galaxy has been studied e…
H.E.S.S. discovery of very high energy gamma-ray emission from PKS 0625-354
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +253
PKS 0625-354 (z=0.055) was observed with the four H.E.S.S. telescopes in 2012 during 5.5 hours. The source was detected above an energy threshold of 200 GeV at a significance level…
The 2014 TeV Gamma-ray Flare of Mrk 501 Seen with H.E.S.S.: Temporal and Spectral Constraints on Lorentz Invariance Violation
H. E. S. S. Collaboration, :, H. Abdalla +232
The blazar Mrk 501 (z=0.034) was observed at very-high-energy (VHE, ~GeV) gamma-ray wavelengths during a bright flare on the night of 2014 June 23-24 (MJD 56832) with…
H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution; evidence for gamma-ray emission extending beyond the X-ray emitting shell
H. E. S. S. Collaboration, :, H. Abdalla +252
Supernova remnants exhibit shock fronts (shells) that can accelerate charged particles up to very high energies. In the past decade, measurements of a handful of shell-type superno…
Searching for TeV gamma-ray emission from SGR\,1935+2154 during its 2020 X-ray and radio bursting phase
H. E. S. S. Collaboration, :, H. Abdalla +251
Magnetar hyperflares are the most plausible explanation for fast radio bursts (FRB) -- enigmatic powerful radio pulses with durations of several milliseconds and high brightness te…
Characterising the VHE diffuse emission in the central 200 parsecs of our Galaxy with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdalla +256
The diffuse very high-energy (VHE, > 100 GeV) gamma-ray emission observed in the central 200 pc of the Milky Way by H.E.S.S. was found to follow the dense matter distribution in th…
Evidence of 100 TeV -ray emission from HESS J1702-420: A new PeVatron candidate
H. Abdalla, F. Aharonian, F. Ait Benkhali +232
The identification of PeVatrons, hadronic particle accelerators reaching the knee of the cosmic ray spectrum (few eV), is crucial to understand the origin of cosmic rays…
Population study of Galactic supernova remnants at very high -ray energies with H.E.S.S.
H. E. S. S. Collaboration, :, H. Abdalla +252
Shell-type supernova remnants (SNRs) are considered prime candidates for the acceleration of Galactic cosmic rays (CRs) up to the knee of the CR spectrum at $\mathrm{E} \approx \ma…
The starburst galaxy NGC 253 revisited by H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, H. Abdalla, F. Aharonian +231
(Abridged) Context. NGC 253 is one of only two starburst galaxies found to emit -rays from hundreds of MeV to multi-TeV energies. Accurate measurements of the very-high-energy…
Measurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of H.E.S.S. blazars
H. E. S. S. Collaboration, :, H. Abdalla +256
Very high-energy gamma-rays (VHE, E>100 GeV) propagating over cosmological distances can interact with the low-energy photons of the extragalactic background light (EBL) and produc…
Search for dark matter annihilations towards the inner Galactic halo from 10 years of observations with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdallah +245
The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a searc…
HESS J1741-302: a hidden accelerator in the Galactic plane
H. E. S. S. Collaboration, :, H. Abdalla +252
The H.E.S.S. collaboration has discovered a new very high energy (VHE, E 0.1 TeV) -ray source, HESS J1741-302, located in the Galactic plane. Despite several attempts to co…
H.E.S.S. limits on line-like dark matter signatures in the 100 GeV to 2 TeV energy range close to the Galactic Centre
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +246
A search for dark matter line-like signals was performed in the vicinity of the Galactic Centre by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likeliho…
Searches for gamma-ray lines and `pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdalla +234
Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems f…
Systematic search for very-high-energy gamma-ray emission from bow shocks of runaway stars
H. E. S. S. Collaboration, :, H. Abdalla +260
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 h…
H.E.S.S. detection of very-high-energy gamma-ray emission from the quasar PKS 0736+017
H. E. S. S. Collaboration, :, H. Abdalla +225
Flat-spectrum radio-quasars (FSRQs) are rarely detected at very-high-energies (VHE; E>100 GeV) due to their low-frequency-peaked SEDs. At present, only 6 FSRQs are known to emit VH…
Upper Limits on Very-High-Energy Gamma-ray Emission from Core-Collapse Supernovae Observed with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdalla +225
Young core-collapse supernovae with dense-wind progenitors may be able to accelerate cosmic-ray hadrons beyond the knee of the cosmic-ray spectrum, and this may result in measurabl…
Constraints on the emission region of 3C 279 during strong flares in 2014 and 2015 through VHE gamma-ray observations with H.E.S.S
H. E. S. S. Collaboration, H. Abdalla, R. Adam +224
The flat spectrum radio quasar 3C 279 is known to exhibit pronounced variability in the high-energy (MeVGeV) -ray band, which is continuously monitored with Fe…
VHE -ray discovery and multi-wavelength study of the blazar 1ES 2322-409
H. E. S. S. Collaboration, :, H. Abdalla +232
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 2…
First limits on the very-high energy gamma-ray afterglow emission of a fast radio burst: H.E.S.S. observations of FRB 150418
H. E. S. S. Collaboration, :, H. Abdalla +265
Aims: Following the detection of the fast radio burst FRB150418 by the SUPERB project at the Parkes radio telescope, we aim to search for very-high energy gamma-ray afterglow emiss…
Probing the magnetic field in the GW170817 outflow using H.E.S.S. observations
H. E. S. S. Collaboration, :, H. Abdalla +230
The detection of the first electromagnetic counterpart to the binary neutron star (BNS) merger remnant GW170817 established the connection between short -ray bursts and BNS mer…
LMC N132D: A mature supernova remnant with a power-law gamma-ray spectrum extending beyond 8 TeV
H. E. S. S. Collaboration, :, H. Abdalla +233
We analyzed 252 hours of High Energy Stereoscopic System (H.E.S.S.) observations towards the supernova remnant (SNR) LMC N132D that were accumulated between December 2004 and March…
H.E.S.S. and Fermi-LAT observations of PSR B1259-63/LS 2883 during its 2014 and 2017 periastron passages
H. E. S. S. Collaboration, H. Abdalla, R. Adam +222
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 di…
Search for -ray line signals from dark matter annihilations in the inner Galactic halo from ten years of observations with H.E.S.S
H. E. S. S. Collaboration, H. Abdallah, A. Abramowski +254
Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy -rays. The central region of the Milky Way halo is one of t…
An extreme particle accelerator in the Galactic plane: HESS J1826130
H. E. S. S. Collaboration, H. Abdalla, R. Adam +236
The unidentified very-high-energy (VHE; E 0.1 TeV) -ray source, HESS J1826130, was discovered with the High Energy Stereoscopic System (HESS) in the Galactic plane. The…
Characterizing the gamma-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, H. Abdalla, A. Abramowski +244
Studying the temporal variability of BL Lac objects at the highest energies provides unique insights into the extreme physical processes occurring in relativistic jets and in the v…
TeV gamma-ray observations of the binary neutron star merger GW170817 with H.E.S.S
H. E. S. S. Collaboration, :, H. Abdalla +250
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 b…
H.E.S.S. observations of the flaring gravitationally lensed galaxy PKS 1830-211
H. E. S. S. Collaboration, :, H. Abdalla +224
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-LAT instrument and evidence for lensi…