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Spectral constraints for millisecond pulsars due to general relativistic frame dragging
(Springer, 2005)
We develop a numerical code for simulating the magnetospheres of millisecond pulsars, which are expected to have unscreened electric potentials due to the lack of magnetic pair production. We incorporate General Relativistic ...
Empirical constraints on the general relativistic electric field associated with PSR J0437-4715
(IOP Publishing, 2005)
We simulate the magnetosphere of the nearby millisecond pulsar PSR J0437-4715, which is expected to have an unscreened electric potential due to the lack of magnetic pair production. We incorporate general relativistic ...
H.E.S.S. constraints on dark matter annihilations towards the Sculptor and Carina dwarf galaxies
(Elsevier, 2011)
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 of 11.8 h and 14.8 h of high quality data, ...
Glow-in-the-dark globular clusters: modelling their multiwavelength lanterns
(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), ...
A search for optical counterparts of the complex Vela X system
(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 ...
HESS observations and VLT spectroscopy of PG 1553+113
(EDP Sciences, 2008)
Aims.The properties of the very high energy (VHE; GeV) γ-ray emission from the high-frequency peaked BL Lac PG 1553+113 are investigated. An attempt is made to measure the currently unknown redshift of this object.
Methods.VHE ...
Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S.
(EDP Sciences, 2009)
The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by the ATIC experiment has – together with
the PAMELA detection of a rise in the positron fraction up to
≈
100 GeV – ...
Supernova remnant evolution in uniform and non-uniform media
(EDP Sciences, 2008)
Very high energy gamma-ray observations of the galaxy clusters Abell 496 and Abell 85 with HESS
(2009)
Aims. The nearby galaxy clusters Abell 496 and Abell 85 are studied in the very high-energy (VHE, GeV) band to investigate VHE cosmic rays (CRs) in this class of objects which are the largest gravitationally bound systems ...
Chandra and HESS observations of the supernova remnant CTB 37B
(EDP Sciences, 2008)
We discovered the >100 GeV γ-ray source, HESS J1713−381, apparently associated with the shell-type supernova remnant (SNR) CTB37B, using
HESS in 2006. In 2007 we performed X-ray follow-up observations with Chandra with ...