A. Djannati-Ataï

H.E.S.S. and Fermi-LAT observations of PSR B1259–63/LS 2883 during its 2014 and 2017 periastron passages

H. Abdalla, R. Adam, F. Aharonian, F. Ait Benkhali et autres

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 phases close to periastron offers a …

Afrique du Sud, fr, ie, de, jp, Namibie, se, au, nl, pl, es, at (code pays fourni par la source)

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, F. Aharonian et autres

The flat spectrum radio quasar 3C 279 is known to exhibit pronounced variability in the high-energy ($100\,$MeV$100\,$GeV) $γ$-ray domain. While the observation in 2014 provides an upper limit, the observation in 2015 results in a signal with $8.7\,σ$ significance above an energy …

jp, de, es, pl, fr (code pays fourni par la source)

Detection of variable VHE γ-ray emission from the extra-galactic γ-ray binary LMC P3

H. Abdalla, A. Abramowski, F. Aharonian, F. Ait Benkhali et autres

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. Aim. This work aims at …

Afrique du Sud, de, ie, am, pl, jp, fr, Namibie, nl, se, at, au (code pays fourni par la source)

Probing Vela pulsar down to 20 GeV with H.E.S.S. II observations

A. Djannati-Ataï, G. Giavitto, M. Holler, B. Rudak et autres

Observations of the Vela pulsar (PSR B0833−45) with the High Energy Stereoscopic System phase II array (H.E.S.S. II) have resulted in a high-significance detection of its pulsed emission down to 20 GeV. The very low-energy threshold reconstruction and analysis methods developed specifically …

fr, pl, Afrique du Sud (code pays fourni par la source)

Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state

A. Abramowski, F. Acero, F. Aharonian, A. G. Akhperjanian et autres

The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV γ-ray (H.E.S.S.), GeV γ-ray (Fermi/LAT), X-ray (RXTE, Swift), UV (Swift) and optical (ATOM, Swift) bands. This campaign was carried out during …

de, fr, ie, am, pl, gb, Afrique du Sud, se, Namibie, at (code pays fourni par la source)

Localizing the VHE gamma-ray source at the Galactic Centre

F. Acero, F. Aharonian, A. G. Akhperjanian, G. Anton et autres

fr (code pays fourni par la source)

A closer look at HESS J1837-069 following the pulsar discovery

V. Marandon, A. Djannati-Ataï, R. Terrier, G. Puehlhofer et autres

The gamma‐ray source HESS J1837‐069 was discovered during the first scan of the galactic plane, and was classified as an unidentified source, possibly associated with AX J1838.0‐0655. Recently, an energetic 23 kyr pulsar was discovered in coincidence with the ASCA source. We …

fr, de (code pays fourni par la source)