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Modeling the pulse profiles of millisecond pulsars in the second LAT catalog of γ-ray pulsars
(AIP, 2012)
Significant γ-ray pulsations have been detected from ∼40 millisecond pulsars (MSPs) using 3 years of sky-survey data from the Fermi LAT and radio timing solutions from across the globe. We have fit the radio and γ-ray pulse ...
Unidentified galactic high-energy sources as ancient pulsar wind nebulae in the light of new high energy observations and the new code
(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 ...
The anatomy of γ-ray pulsar light curves
(South African Institute of Physics, 2014)
To obtain constraints on the inclination and observer angles, <i>α</i> and <i>ζ</i>, of a <i>γ</i>-ray pulsar from its observed light curve (LC), we make use of geometric models detailing the position and extent of emission ...
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 ...
Calibration of statistical methods used to constrain pulsar geometries via multiband light curve modelling
(SAIP, 2016)
Since its launch in 2008, the Fermi Large Area Telescope (LAT) has detected over
200 γ-ray pulsars above 100 MeV. This population of pulsars is characterised by a rich diversity
of light curve morphologies. Researchers ...
Investigating gamma-ray fluxes from globular clusters
(SAIP, 2016)
Globular clusters are large collections of old stars that are orbiting the core of
a galaxy. Our Milky Way Galaxy has about 160 known clusters, with perhaps more to be
discovered. We first accumulated the necessary ...
Very-high energy emission from pulsars
(SAIP, 2015)
The vast majority of pulsars detected by the Fermi Large Area Telescope (LAT)
display exponentially cutoff spectra with cutoffs falling in a narrow band around a few GeV.
Early spectral modelling predicted spectral cutoffs ...
Modelling the polarisation signatures detected from the first white dwarf pulsar AR Sco.
(Sissa Medialab, 2018)
Marsh et al. (2016) detected radio and optical pulsations from the binary system AR Scorpii (AR Sco). This system, with an orbital period of 3.55 h, is composed of a cool, low-mass star and a white dwarf with a spin period ...
Implementation of a goodness-of-fit test for finding optimal concurrent radio and γ-ray pulsar light curves
(SAIP, 2015)
Since the launch of the Fermi Large Area Telescope in 2008 the number of known
γ-ray pulsars has increased immensely to over 200, many of which are also visible in the
radio and X-ray bands. Seyffert et al. (2011) ...