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Modelling the stellar soft-photon energy density of globular clusters
(South African Institute of Physics, 2014)
Recent observations by e.g. Fermi LAT and H.E.S.S. have revealed globular clusters to be sources of high-energy and very-high-energy gamma rays. It has been suggested that the presence of large numbers of millisecond pulsars ...
Modelling energy-dependent pulsar light curves due to curvature radiation
(Sissa Medialab, 2017)
Pulsars emit pulsed emission across the entire electromagnetic spectrum and their light curve phenomenology is strongly dependent on energy. This is also true for the gamma-ray waveband. Continued detections by Fermi Large ...
Simultaneous spectral and spatial modelling of young pulsar wind nebulae
(Sissa Medialab, 2017)
We model the morphology and spectrum of a pulsar wind nebula using a leptonic emission
code. This code is a time-dependent, multi-zone model that investigates the changes in
the particle spectrum as they traverse the ...
Assessment of a statistical approach that facilitates the constraint of pulsar geometry via dualband light curve fitting
(Sissa Medialab, 2017)
The Large Area Telescope aboard the Fermi spacecraft has detected more than 200 γ-ray pulsars
since its launch in 2008. By concurrently fitting standard geometric model light curves onto Fermi
and radio data, researchers ...
Simultaneous fitting of the spectral energy density, energy-dependent size, and X-ray spectral index vs. radius of the young pulsar wind nebula PWN G0.9+0.1
(Sissa Medialab, 2018)
We have constructed and calibrated a spherically-symmetric, spatially-dependent particle
transport and emission code for young pulsar wind nebulae (PWNe). This code predicts
the spectral energy distribution (SED) of the ...
The millisecond pulsar contribution to the rising positron fraction
(Sissa Medialab, 2016)
Pair cascades from millisecond pulsars (MSPs) may be a primary source of Galactic electrons and
positrons that contribute to the increase in positron flux above 10 GeV as observed by PAMELA
and AMS−02. The Fermi Large ...
New advances in pulsar magnetosphere modelling
(Sissa Medialab, 2016)
The wealth of high-energy (E &50MeV) and very-high-energy (E >100 GeV) data accumulated
over the past few years have provided unprecedented opportunities to probe pulsar emission models.
The Fermi Large Area Telescope ...
High-energy emission from Black Widows and Redbacks
(Sissa Medialab, 2015)
A large number of new black widow and redback energetic millisecond pulsars with irradiated
stellar companions have been discovered through radio searches of unidentified Fermi sources.
We construct a 3D emission model ...
The aid of optical studies in understanding millisecond pulsar binaries
(Sissa Medialab, 2016)
A large number of new “black widow” and “redback” energetic millisecond pulsars with irradiated stellar companions have been discovered through radio and optical searches of unidentified
Fermi sources. Synchrotron emission, ...
Pulsations from the Vela pulsar down to 20 GeV with H.E.S.S. II
(Sissa Medialab, 2015)
The Vela pulsar (PSR J0835 − 4510) is the brightest persistent source in the high-energy γ-ray
sky. It is a relatively near, young and energetic rotation-powered pulsar. Vela was a key target for
the High Energy Stereoscopic ...