Publications (67)
Acceleration of petaelectronvolt protons in the Galactic Centre
H. E. S. S. collaboration, :, A. Abramowski +229
Galactic cosmic rays reach energies of at least a few Peta-electronvolts (1 PeV = electron volts). This implies our Galaxy contains PeV accelerators (PeVatrons), bu…
Search for Very-high-energy γ-ray emission from Galactic globular clusters with H.E.S.S
H. E. S. S. Collaboration, :, A. Abramowski +203
Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV<E<100 GeV) γ-ray radiation which could originate from the cumulative emission of the numerous millisec…
Discovery of hard-spectrum γ-ray emission from the BL Lac object 1ES 0414+009
The HESS Collaboration, A. Abramowski, F. Acero +199
1ES 0414+009 (z = 0.287) is a distant high-frequency-peaked BL Lac object, and has long been considered a likely emitter of very-high energy (VHE, E>100 GeV) gamma-rays due to its…
Sensitivity of the SHiP experiment to dark photons decaying to a pair of charged particles
SHiP Collaboration, C. Ahdida, A. Akmete +331
Dark photons are hypothetical massive vector particles that could mix with ordinary photons. The simplest theoretical model is fully characterised by only two parameters: the mass…
Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
H. E. S. S. Collaboration, :, A. Abramowski +201
Gamma-ray line signatures can be expected in the very-high-energy (VHE; E_γ> 100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signa…
Detailed spectral and morphological analysis of the shell type SNR RCW 86
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +232
Aims: We aim for an understanding of the morphological and spectral properties of the supernova remnant RCW~86 and for insights into the production mechanism leading to the RCW~86…
Constraints on axionlike particles with H.E.S.S. from the irregularity of the PKS 2155-304 energy spectrum
H. E. S. S. Collaboration, A. Abramowski, F. Acero +211
Axionlike particles (ALPs) are hypothetical light (sub-eV) bosons predicted in some extensions of the Standard Model of particle physics. In astrophysical environments comprising h…
H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
HESS Collaboration, A. Abramowski, F. Acero +192
The Sculptor and Carina Dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total…
Probing the gamma-ray emission from HESS J1834-087 using H.E.S.S. and Fermi LAT observations
The H. E. S. S. Collaboration, :, A. Abramowski +228
Previous observations with HESS have revealed the existence of an extended very-high-energy (VHE; E>100 GeV) gamma-ray source, HESS J1834-087, coincident with the SNR W41. The orig…
Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463
H. E. S. S. Collaboration, :, A. Abramowski +230
This letter reports the discovery of a remarkably hard spectrum source, HESS J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very-high energy (VHE) domain. HESS…
H.E.S.S. Observations of the Crab during its March 2013 GeV Gamma-Ray Flare
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +217
Context. On March 4, 2013, the Fermi-LAT and AGILE reported a flare from the direction of the Crab Nebula in which the high-energy (HE; E > 100 MeV) flux was six times above its qu…
HESS J1943+213: a candidate extreme BL Lacertae object
H. E. S. S. Collaboration, :, A. Abramowski +200
We report on a newly detected point-like source, HESS J1943+213 located in the Galactic plane. This source coincides with an unidentified hard X-ray source IGR J19443+2117, which w…
Discovery of very high energy gamma-ray emission from the BL Lac object PKS 0301-243 with H.E.S.S
H. E. S. S. Collaboration, A. Abramowski, F. Acero +211
The active galactic nucleus PKS 0301-243 (z=0.266) is a high-synchrotron-peaked BL Lac object that is detected at high energies (HE, 100 MeV < E < 100 GeV) by Fermi/LAT. This paper…
Discovery of VHE γ-ray emission and multi-wavelength observations of the BL Lac object 1RXS J101015.9-311909
HESS Collaboration, A. Abramowski, F. Acero +191
1RXS J101015.9-311909 is a galaxy located at a redshift of z=0.14 hosting an active nucleus belonging to the class of bright BL Lac objects. Observations at high (HE, E > 100 MeV)…
Search for a Dark Matter annihilation signal from the Galactic Center halo with H.E.S.S
H. E. S. S. Collaboration, :, A. Abramowski +193
A search for a very-high-energy (VHE; >= 100 GeV) gamma-ray signal from self-annihilating particle Dark Matter (DM) is performed towards a region of projected distance r ~ 45-150 p…
Revisiting the Westerlund 2 Field with the H.E.S.S. Telescope Array
The HESS Collaboration, A. Abramowski, F. Acero +194
Aims. Previous observations with the H.E.S.S. telescope array revealed the existence of extended very-high-energy (VHE; E>100 GeV) γ-ray emission, HESS J1023-575, coincident with…
A new SNR with TeV shell-type morphology: HESS J1731-347
HESS Collaboration, A. Abramowski, F. Acero +195
The recent discovery of the radio shell-type supernova remnant (SNR), G353.6-0.7, in spatial coincidence with the unidentified TeV source HESS J1731-347 has motivated further obser…
The 2012 flare of PG 1553+113 seen with H.E.S.S. and Fermi-LAT
A. Abramowski, F. Aharonian, F. Ait Benkhali +224
Very high energy (VHE, 100 GeV) -ray flaring activity of the high-frequency peaked BL Lac object \pg\ has been detected by the \hess\ telescopes. The flux of the source inc…
Discovery of extended VHE γ-ray emission from the vicinity of the young massive stellar cluster Westerlund 1
HESS Collaboration, A. Abramowski, F. Acero +198
Results obtained in very-high-energy (VHE; E > 100 GeV) γ-ray observations performed with the H.E.S.S. telescope array are used to investigate particle acceleration processes in t…
Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state
The H. E. S. S. Collaboration, the Fermi LAT Collaboration, : +345
The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV gamma-ray (H.E.S.S.), GeV gamma-ray (Fe…
Long-term monitoring of PKS 2155304 with ATOM and H.E.S.S.: investigation of optical/-ray correlations in different spectral states
A. Abramowski, F. Aharonian, F. Ait Benkhali +225
In this paper we report on the analysis of all the available optical and very high-energy -ray (200 GeV) data for the BL Lac object PKS 2155304, collected simultaneously…
Diffuse Galactic gamma-ray emission with H.E.S.S
H. E. S. S. Collaboration, :, A. Abramowski +225
Diffuse -ray emission is the most prominent observable signature of celestial cosmic-ray interactions at high energies. While already being investigated at GeV energies over se…
Search for TeV Gamma-ray Emission from GRB 100621A, an extremely bright GRB in X-rays, with H.E.S.S
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +213
The long gamma-ray burst (GRB) 100621A, at the time the brightest X-ray transient ever detected by Swift-XRT in the keV range, has been observed with the H.E.S.S…
The exceptionally powerful TeV gamma-ray emitters in the Large Magellanic Cloud
H. E. S. S. Collaboration, :, A. Abramowski +226
The Large Magellanic Cloud, a satellite galaxy of the Milky Way, has been observed with the High Energy Stereoscopic System (H.E.S.S.) above an energy of 100 billion electron volts…
Speeding up complex multivariate data analysis in Borexino with parallel computing based on Graphics Processing Unit
X. F. Ding, M. Agostini, K. Altenmuller +104
A spectral fitter based on the graphics processor unit (GPU) has been developed for Borexino solar neutrino analysis. It is able to shorten the fitting time to a superior level com…
Discovery of the VHE gamma-ray source HESS J1832-093 in the vicinity of SNR G22.7-0.2
H. E. S. S. Collaboration, :, A. Abramowski +218
The region around the supernova remnant (SNR) W41 contains several TeV sources and has prompted the H.E.S.S. Collaboration to perform deep observations of this field of view. This…
H.E.S.S. Observations of the Binary System PSR B1259-63/LS 2883 around the 2010/2011 Periastron Passage
H. E. S. S. Collaboration, :, A. Abramowski +203
Aim. In this paper we present very high energy (VHE; E>100 GeV) data from the γ-ray binary system PSR B1259-63/LS 2883 taken around its periastron passage (15th of December 2010)…
Spectral analysis and interpretation of the γ-ray emission from the Starburst galaxy NGC 253
H. E. S. S. Collaboration, A. Abramowski, F. Acero +192
Very-high-energy (VHE; E >100 GeV) and high-energy (HE; 100 MeV < E < 100 GeV) data from γ-ray observations performed with the H.E.S.S. telescope array and the Fermi-LAT instrumen…
H.E.S.S. discovery of VHE gamma-rays from the quasar PKS 1510-089
H. E. S. S. Collaboration, A. Abramowski, F. Acero +204
The quasar PKS 1510-089 (z=0.361) was observed with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes during high states in the optical and GeV bands, to search for ve…
Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
HESS Collaboration, A. Abramowski, F. Acero +195
The Fornax galaxy cluster was observed with the High Energy Stereoscopic System (H.E.S.S.) for a total live time of 14.5 hours, searching for very-high-energy (VHE, E>100 GeV) gamm…
H.E.S.S. detection of TeV emission from the interaction region between the supernova remnant G349.7+0.2 and a molecular cloud
H. E. S. S. Collaboration, :, A. Abramowski +224
G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE) Ga…
Flux upper limits for 47 AGN observed with H.E.S.S. in 2004-2011
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +217
About 40% of the observation time of the High Energy Stereoscopic System (H.E.S.S.) is dedicated to studying active galactic nuclei (AGN), with the aim of increasing the sample of…
H.E.S.S. reveals a lack of TeV emission from the supernova remnant Puppis A
H. E. S. S. Collaboration, :, A. Abramowski +224
Puppis A is an interesting ~4 kyr-old supernova remnant (SNR) that shows strong evidence of interaction between the forward shock and a molecular cloud. It has been studied in deta…
A multiwavelength view of the flaring state of PKS 2155-304 in 2006
HESS Collaboration, A. Abramowski, F. Acero +208
Multiwavelength (MWL) observations of the blazar PKS 2155-304 during two weeks in July and August 2006, the period when two exceptional flares at very high energies (VHE, E>= 100 G…
Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589
HESS Collaboration, A. Abramowski, F. Acero +195
The observational coverage with HESS of the Carina region in VHE gamma-rays benefits from deep exposure (40 h) of the neighboring open cluster Westerlund 2. The observations have r…
Constraints on an Annihilation Signal from a Core of Constant Dark Matter Density around the Milky Way Center with H.E.S.S
HESS Collaboration, A. Abramowski, F. Aharonian +223
An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated ON/OFF observations of the Galactic center region with H.…
HESS J1640-465 - an exceptionally luminous TeV gamma-ray supernova remnant
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +218
The results of follow-up observations of the TeV gamma-ray source HESSJ 1640-465 from 2004 to 2011 with the High Energy Stereoscopic System (H.E.S.S.) are reported in this work. Th…
Seasonal Modulation of the Be Solar Neutrino Rate in Borexino
M. Agostini, K. Altenmuller, S. Appel +99
We detected the seasonal modulation of the Be neutrino interaction rate with the Borexino detector at the Laboratori Nazionali del Gran Sasso in Italy. The period, amplitude, a…
Probing the extent of the non-thermal emission from the Vela X region at TeV energies with H.E.S.S
A. Abramowski, F. Acero, F. Aharonian +196
Vela X is a region of extended radio emission in the western part of the Vela constellation: one of the nearest pulsar wind nebulae (PWNe), and associated with the energetic Vela p…
Discovery of high and very high-energy emission from the BL Lac object SHBL J001355.9-185406
H. E. S. S. Collaboration, :, A. Abramowski +210
The detection of the high-frequency peaked BL Lac object (HBL) SHBL J001355.9-185406 (=0.095) at high (HE; 100 MeVE300 GeV) and very high-energy (VHE; )…
H.E.S.S. observations of the Carina nebula and its enigmatic colliding wind binary Eta Carinae
HESS Collaboration, A. Abramowski, F. Acero +191
The massive binary system Eta Carinae and the surrounding HII complex, the Carina Nebula, are potential particle acceleration sites from which very-high-energy (VHE; E > 100 GeV) Î…
H.E.S.S. observations of the globular clusters NGC 6388 and M 15 and search for a Dark Matter signal
HESS Collaboration, A. Abramowski, F. Acero +195
Observations of the globular clusters NGC 6388 and M 15 were carried out by the H.E.S.S. array of Cherenkov telescopes for a live time of 27.2 and 15.2 hours respectively. No gamma…
Search for Extended γ-ray Emission around AGN with H.E.S.S. and Fermi-LAT
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +218
Context: Very-high-energy (VHE; E>100 GeV) γ-ray emission from blazars inevitably gives rise to electron-positron pair production through the interaction of these γ-rays with the…
Very-high-energy gamma-ray emission from the direction of the Galactic globular cluster Terzan 5
HESS Collaboration, A. Abramowski, F. Acero +194
The H.E.S.S. very-high-energy (VHE, E > 0.1 TeV) gamma-ray telescope system has discovered a new source, HESS J1747-248. The measured integral flux is (1.2 +/- 0.3) \times 10^-12 c…
H.E.S.S and Fermi-LAT discovery of gamma rays from the blazar 1ES 1312-423
H. E. S. S. Collaboration, A. Abramowski, F. Acero +214
A deep observation campaign carried out by the High Energy Stereoscopic System (H.E.S.S.) on Centaurus A enabled the discovery of gamma rays from the blazar 1ES 1312-423, two degre…
Discovery of gamma-ray emission from the extragalactic pulsar wind nebula N157B with the High Energy Stereoscopic System
HESS Collaboration, A. Abramowski, F. Acero +195
We present the significant detection of the first extragalactic pulsar wind nebula (PWN) detected in gamma rays, N157B, located in the large Magellanic Cloud (LMC). Pulsars with hi…
Search for Lorentz Invariance breaking with a likelihood fit of the PKS 2155-304 flare data taken on MJD 53944
HESS Collaboration, A. Abramowski, F. Acero +193
Several models of Quantum Gravity predict Lorentz Symmetry breaking at energy scales approaching the Planck scale (10^{19} GeV). With present photon data from the observations of d…
Identification of HESS J1303-631 as a Pulsar Wind Nebula through gamma-ray, X-ray and radio observations
The H. E. S. S. Collaboration, :, A. Abramowski +196
The previously unidentified very high-energy (VHE; E > 100 GeV) γ-ray source HESS J1303-631, discovered in 2004, is re-examined including new data from the H.E.S.S. Cherenkov tele…
Modulations of the Cosmic Muon Signal in Ten Years of Borexino Data
The Borexino Collaboration, M. Agostini, K. Altenmüller +113
We have measured the flux of cosmic muons in the Laboratori Nazionali del Gran Sasso at 3800\,m\,w.e. to be based on ten y…
Measurement of the extragalactic background light imprint on the spectra of the brightest blazars observed with H.E.S.S
H. E. S. S. Collaboration, :, A. Abramowski +195
The extragalactic background light (EBL) is the diffuse radiation with the second highest energy density in the Universe after the cosmic microwave background. The aim of this stud…
HESS J1818-154, a new composite supernova remnant discovered in TeV gamma rays and X-rays
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +217
Composite supernova remnants (SNRs) constitute a small subclass of the remnants of massive stellar explosions where non-thermal radiation is observed from both the expanding shell-…
Multi-wavelength Observations of H 2356-309
HESS Collaboration, A. Abramowski, F. Acero +184
AIMS: The properties of the broad-band emission from the high-frequency peaked BL Lac H 2356-309 (z=0.165) are investigated. METHODS: Very High Energy (VHE; E > 100 GeV) observatio…
Limiting neutrino magnetic moments with Borexino Phase-II solar neutrino data
M. Agostini, K. Altenmüller, S. Appel +104
A search for the solar neutrino effective magnetic moment has been performed using data from 1291.5 days exposure during the second phase of the Borexino experiment. No significant…
SND@LHC
SHiP Collaboration, C. Ahdida, A. Akmete +341
We propose to build and operate a detector that, for the first time, will measure the process at the LHC and search for feebly interacting particles (FIPs) in an unexplo…
Simultaneous Precision Spectroscopy of , Be, and Solar Neutrinos with Borexino Phase-II
M. Agostini, K. Altenmuller, S. Appel +104
We present the first simultaneous measurement of the interaction rates of , Be, and solar neutrinos performed with a global fit to the Borexino data in an extended en…
Discovery of TeV gamma-ray emission from PKS 0447-439 and derivation of an upper limit on its redshift
H. E. S. S. Collaboration, :, A. Abramowski +204
Very high-energy gamma-ray emission from PKS 0447-439 was detected with the H.E.S.S. Cherenkov telescope array in December 2009. This blazar is one of the brightest extragalactic o…
Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856
H. E. S. S. Collaboration, :, A. Abramowski +230
Re-observations with the H.E.S.S. telescope array of the very-high-energy (VHE) source HESS J1018-589 A coincident with the Fermi-LAT -ray binary 1FGL J1018.6-5856 have resulte…
A search for low-energy neutrinos correlated with gravitational wave events GW150914, GW151226 and GW170104 with the Borexino detector
M. Agostini, K. Altenmuller, S. Appel +99
We present the results of a low-energy neutrino search using the Borexino detector in coincidence with the gravitational wave (GW) events GW150914, GW151226 and GW170104. We search…
Constraints on the gamma-ray emission from the cluster-scale AGN outburst in the Hydra A galaxy cluster
HESS Collaboration, A. Abramowski, F. Acero +193
In some galaxy clusters powerful AGN have blown bubbles with cluster scale extent into the ambient medium. The main pressure support of these bubbles is not known to date, but cosm…
The 2010 very high energy gamma-ray flare & 10 years of multi-wavelength observations of M 87
The H. E. S. S. Collaboration, :, A. Abramowski +442
Abridged: The giant radio galaxy M 87 with its proximity, famous jet, and very massive black hole provides a unique opportunity to investigate the origin of very high energy (VHE;…
TeV γ-ray observations of the young synchrotron-dominated SNRs G1.9+0.3 and G330.2+1.0 with H.E.S.S
H. E. S. S. Collaboration, A. Abramowski, F. Aharonian +217
The non-thermal nature of the X-ray emission from the shell-type supernova remnants (SNRs) G1.9+0.3 and G330.2+1.0 is an indication of intense particle acceleration in the shock fr…
VHE gamma-ray emission of PKS 2155-304: spectral and temporal variability
HESS Collaboration, A. Abramowski, F. Acero +185
Observations of very high energy gamma-rays from blazars provide information about acceleration mechanisms occurring in their innermost regions. Studies of variability in these obj…
Discovery of the source HESS J1356-645 associated with the young and energetic PSR J1357-6429
HESS Collaboration, A. Abramowski, F. Acero +195
Several newly discovered very-high-energy (VHE; E > 100 GeV) gamma-ray sources in the Galaxy are thought to be associated with energetic pulsars. Among them, middle-aged (> 1E+4 yr…
The Monte Carlo simulation of the Borexino detector
M. Agostini, K. Altenmuller, S. Appel +97
We describe the Monte Carlo (MC) simulation package of the Borexino detector and discuss the agreement of its output with data. The Borexino MC 'ab initio' simulates the energy los…
Detection of very-high-energy gamma-ray emission from the vicinity of PSR B1706-44 and G343.1-2.3 with H.E.S.S
H. E. S. S. Collaboration, :, A. Abramowski +198
The gamma-ray pulsar PSR B1706-44 and the adjacent supernova remnant (SNR) candidate G343.1-2.3 were observed by H.E.S.S. during a dedicated observation campaign in 2007. As a resu…
Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies
H. E. S. S. Collaboration, :, A. Abramowski +229
Dwarf spheroidal galaxies of the Local Group are close satellites of the Milky Way characterized by a large mass-to-light ratio and are not expected to be the site of non-thermal h…
Long-term TeV and X-ray Observations of the Gamma-ray Binary HESS J0632+057
VERITAS Collaboration, E. Aliu, S. Archambault +297
HESS J0632+057 is the only gamma-ray binary known so far whose position in the sky allows observations with ground-based observatories both in the northern and southern hemispheres…