Search
Now showing items 1-10 of 15
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 ...
Modelling energy-dependent pulsar light curves
(Cambridge Univ Press, 2018)
In recent years, surprise discoveries of pulsed emission from the Crab and Vela pulsars
above 100 GeV have drawn renewed attention to this largely unexplored region of the energy
range. In this paper, we discuss example ...
MSP binaries as astrophysical laboratories
(Cambridge Univ Press, 2018)
Follow-up of unidentified Fermi sources has expanded the number of known galactic-field “black widow” and “redback” millisecond pulsar binaries from four to nearly 30. Several systems observed by Chandra, XMM-Newton, Suzaku, ...
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 ...
Gamma‐ray pulsar visibility
(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 ...