Browsing Conference Papers - Potchefstroom Campus by Author "10065857 - De Jager, Ocker Cornelis"

Now showing items 1-9 of 9

    • Constraints on the lepton content of PWN from the local CR positron spectrum 

      Büsching, I.; De Jager, O.C.; Potgieter, M.S.; Venter, C. (ICRC, 2008)
      Geminga is a nearby pulsar with an age of 3.42×105 yr and a spindown power of 3.2×1034 erg/s at present. B0656+14 has comparable spindown power, with an age of 1.11×105 yr and a distance of 290 pc. The winds of these ...

    • Estimates for very high energy gamma rays from globular cluster pulsars 

      Venter, C.; De Jager, O.C. (AIP, 2008)
      Low‐Mass X‐ray Binaries (LMXRBs), believed to be the progenitors of recycled millisecond pulsars (MSPs), occur abundantly in globular clusters (GCs). GCs are therefore expected to host large numbers of MSPs. This is also ...

    • Gamma‐ray pulsar visibility 

      Venter, Christo; De Jager, Ocker C.; Tiplady, Adrian (AIP, 2005)
      PSR J0437‐4715 is a millisecond pulsar (MSP) thought to be “pair formation starved” (having limited pair cascades due to magnetic photon absorption). Fortunately the general relativistic (GR) electrodynamical model under ...

    • Geometric modelling of radio and γ-ray light curves of 6 Fermi LAT pulsars 

      Seyffert, A.S.; Venter, C.; De Jager, O.C.; Harding, A.K. (Sissa Medialab, 2010)
      The Fermi Large Area Telescope (LAT) has recently reported the detection of pulsed γ-rays from 6 young pulsars (J0631+1036, J0659+1414, J0742−2822, J1420−6048, J1509−5850, and J1718−3825), all exhibiting single-peaked ...

    • Glow-in-the-dark globular clusters: modelling their multiwavelength lanterns 

      Venter, C.; Büsching, I.; De Jager, O.C.; Kopp, A.; Clapson, A-C. (South African Institute of Physics, 2012)
      Globular clusters (GCs) are astronomical tapestries embroidered with an abundance of exotic stellar-type objects, including ancient metal-poor stars, planetary nebulae, white dwarfs (WDs), low-mass X-ray binaries (LMXRBs), ...

    • Modeling high-energy and very-high-energy γ-rays from the Terzan 5 cluster 

      Venter, C.; De Jager, O.C.; Kopp, A.; Büsching, I. (Fermi, 2011)
      The Fermi Large Area Telescope (LAT) has recently detected a population of globular clusters (GCs) in highenergy (HE) γ-rays. Their spectral properties and energetics are consistent with cumulative emission from a population ...

    • Multiwavelength modeling of the globular cluster Terzan 5 

      Büsching, I.; Venter, C.; Kopp, A.; De Jager, O.C.; Clapson, A.C. (ICRC, 2011)
      Diffuse X-ray emission has recently been detected from the globular cluster (GC) Terzan 5, extending out to ~2.5' from the cluster centre. This emission may arise from synchrotron radiation (SR) by energetic leptons being ...

    • A search for optical counterparts of the complex Vela X system 

      Marubini, T.E.; Venter, C.; De Jager, O.C.; Sefako, R.R. (South African Institute of Physics, 2015)
      The pulsar wind nebula (PWN) associated with the Vela pulsar is a bright source in the radio, X-ray and gamma-ray bands, but not in the optical. This source is very near, lying at a distance of 290 pc, as inferred from ...

    • Unidentified galactic high-energy sources as ancient pulsar wind nebulae in the light of new high energy observations and the new code 

      Tibolla, O.; Vorster, M.; De Jager, O.; Ferreira, S.E.S.; Venter, C. (AIP, 2012)
      In a Pulsar Wind Nebula (PWN), the lifetime of inverse Compton (IC) emitting e− exceeds the lifetime of its progenitor pulsar (as well as its shell-type remnant), but it also exceeds the age of those that emit via synchrotron ...