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Now showing items 151-160 of 228
First ground-based measurement of sub-20 GeV to 100GeV y-Rays from the Vela pulsar with H.E.S.S. II
(EDP Sciences, 2018)
Aims. We report on the measurement and investigation of pulsed high-energy γ-ray emission from the Vela pulsar, PSR B0833−45, based on observations with the largest telescope of H.E.S.S., CT5, in monoscopic mode, and on ...
The y-ray spectrum of the core of Centaurus A as observed with H.E.S.S. and Fermi-LAT
(EDP Sciences, 2018)
Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV–100 TeV) γ-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE γ-ray emitter, though its VHE flux ...
Science with e-ASTROGAM: a space mission for MeV-GeV gamma-ray astrophysics
(Elsevier, 2018)
e-ASTROGAM (‘enhanced ASTROGAM’) is a breakthrough Observatory space mission, with a detector
composed by a Silicon tracker, a calorimeter, and an anticoincidence system, dedicated to the study of
the non-thermal Universe ...
Measurement of the EBL spectral energy distribution using the VHE γ-ray spectra of H.E.S.S. blazars
(EDP Sciences, 2017)
Very high-energy γ rays (VHE, E ≳ 100 GeV) propagating over cosmological distances can interact with the low-energy photons of the extragalactic background light (EBL) and produce electron-positron pairs. The transparency ...
High-energy pulsar light curves in an offset polar cap B-field geometry
(HEASA, 2016)
The light curves and spectral properties of more than 200
γ
-ray pulsars have been measured in
unsurpassed detail in the eight years since the launch of the hugely successful
Fermi
Large Area
Telescope (LAT)
γ
-ray ...
A polarized fast radio burst at low Galactic latitude
(Oxford Univ Press, 2017)
We report on the discovery of a new fast radio burst (FRB), FRB 150215, with the Parkes
radio telescope on 2015 February 15. The burst was detected in real time with a dispersion
measure (DM) of 1105.6 ± 0.8 pc cm−3, a ...
Characterizing the γ-ray long-term variability of PKS 2155-304 with H.E.S.S. and Fermi-LAT
(EDP Sciences, 2017)
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 vicinity of super-massive black holes. To ...
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: the case of PKS 2155-304 and PG 1553+113
(EDP Sciences, 2017)
Context. The addition of a 28 m Cherenkov telescope (CT5) to the H.E.S.S. array extended the experiment’s sensitivityto lower energies. The lowest energy threshold is obtained using monoscopic analysis of data taken with ...
H.E.S.S. discovery of very high energy γ-ray emission from PKS 0625−354
(Oxford Univ Press, 2018)
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. ...
The starburst galaxy NGC 253 revisited by H.E.S.S. and Fermi-LAT
(EDP Sciences, 2018)
Context. NGC 253 is one of only two starburst galaxies found to emit γ-rays from hundreds of MeV to multi-TeV energies. Accurate measurements of the very-high-energy (VHE; E > 100 GeV) and high-energy (HE; E > 60 MeV) ...