Browsing by Subject "Gamma rays: stars"

Now showing items 1-10 of 16

    • Broadband pulsations from PSR B1821-24: implications for emission models and the pulsar population of M28 

      Johnson, T.J.; Venter, C.; Guillemot, L.; Kerr, M.; Cognard, I.; Fermi LAT (IOP Publishing, 2013)
      We report the Fermi Large Area Telescope discovery of γ-ray pulsations from the 22.7 ms pulsar A in the double pulsar system J0737−3039A/B. This is the first mildly recycled millisecond pulsar (MSP) detected in the GeV ...

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

      Abdalla, H.; Barnard, M.; Böttcher, M.; Garrigoux, T.; Ivascenko, A.; Krüger, P.P.; Ndiyavala, H.; Pekeur, N.W.; Seyffert, A.S.; Spanier, F.; Sushch, I.; Van der Walt, D.J.; Van Rensburg, C.; Venter, C.; Wadiasingh, Z.; Zacharias, M.; H.E.S.S. Collaboration (EDP Sciences, 2018)
      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 ...

    • Discovery of VHE emission towards the Carina arm region with the H.E.S.S. telescope array: HESS J1018-589 

      Abramowski, A.; Büsching, I.; Casanova, S.; De Jager, O.C.; Pekeur, N.W.; Sheidaei, F.; Venter, C.; Vorster, M.; H.E.S.S. Collaboration (EDP Sciences, 2012)
      The Carina arm region, containing the supernova remnant SNR G284.3–1.8, the high-energy (HE; E > 100 MeV) binary 1FGL J1018.6–5856 and the energetic pulsar PSR J1016–5857 and its nebula, has been observed with the H.E.S.S. ...

    • The effect of an offset polar cap dipolar magnetic field on the modeling of the Vela pulsar's γ-ray light curves 

      Barnard, M.; Venter, C.; Harding, K. (IOP Publishing, 2016)
      We performed geometric pulsar light curve modeling using static, retarded vacuum, and offset polar cap (PC) dipole B-fields (the latter is characterized by a parameter epsilon), in conjunction with standard two-pole caustic ...

    • Fermi LAT pulsed detection of PSR J0737-3039A in the double pulsar system 

      Guillemot, L.; Venter, C.; Kramer, M.; Johnson, T.J.; Craig, H.A.; Fermi LAT (IOP Publishing, 2013)
      We report the Fermi Large Area Telescope discovery of γ-ray pulsations from the 22.7 ms pulsar A in the double pulsar system J0737−3039A/B. This is the first mildly recycled millisecond pulsar (MSP) detected in the GeV ...

    • Fermi-LAT observations of the Geminga pulsar 

      Abdo, A.A.; Venter, C.; Ackermann, M.; Ajello, M.; Baldini, L.; Fermi LAT (IOP Publishing, 2010)
      We report on the Fermi-LAT observations of the Geminga pulsar, the second brightest non-variable GeV source in the γ-ray sky and the first example of a radio-quiet γ-ray pulsar. The observations cover one year, from the ...

    • First detection of VHE y-rays from SN 1006 by HESS 

      Acero, F.; Büsching, I.; Davids, I.D.; De Jager, O.C.; Holleran, M.; Raubenheimer, B.C.; Venter, C.; H.E.S.S. Collaboration (EDP Sciences, 2010)
      Aims. Recent theoretical predictions of the lowest very high energy (VHE) luminosity of SN 1006 are only a factor 5 below the previously published HESS upper limit, thus motivating further in-depth observations of this ...

    • First ground-based measurement of sub-20 GeV to 100GeV y-Rays from the Vela pulsar with H.E.S.S. II 

      Abdalla, H.; Arcaro, C.; Barnard, M.; Böttcher, M.; Chandra, S.; Krüger, P.P.; Ndiyavala, H.; Seyffert, A.S.; Spanier, F.; Van der Walt, D.J.; Van Rensburg, C.; Venter, C.; Wadiasingh, Z.; Zacharias, M.; H.E.S.S. Collaboration (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 ...

    • Gamma-gamma absorption in the γ-ray binary system PSR B1259-63/LS 2883 

      Sushch, Iurii; Van Soelen, Brian (IOP, 2017)
      The observed TeV light curve from the γ-ray binary PSR B1259-63/LS 2883 shows a decrease in the flux at periastron that has not been fully explained by emission mechanisms alone. This observed decrease can, however, be ...

    • H.E.S.S. and Suzaku observations of the Vela X pulsar wind nebula 

      Abdalla, H.; Arcaro, C.; Backes, M.; Barnard, M.; Böttcher, M.; Chand, T.; Chandra, S.; Ndiyavala, H.; Schutte, H.; Seyffert, A.S.; Van der Walt, D.J.; Van Rensburg, C.; Venter, C.; Wadiasingh, Z.; Zacharias, M.; Zywucka, N.; H.E.S.S. Collaboration (EDP Sciences, 2019)
      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 ...