Particle Acceleration at Interplanetary Shocks (2008)
Baring, Matthew G., Summerlin, Errol J.
The acceleration of interstellar pick-up ions as well as solar wind species has been observed at a multitude of interplanetary (IP) shocks by different spacecraft. This paper expands upon previous...
Photon Splitting and Pair Conversion in Strong Magnetic Fields (2008)
The magnetospheres of neutron stars provide a valuable testing ground for as-yet unverified theoretical predictions of quantum electrodynamics (QED) in strong electromagnetic fields. Exhibiting...
Modeling the Non-Thermal X-ray Tail Emission of Anomalous X-ray Pulsars (2008)
Baring, Matthew G., Harding, Alice K.
The paradigm for Anomalous X-ray Pulsars (AXPs) has evolved recently with the discovery by INTEGRAL and RXTE of flat, hard X-ray components in three AXPs. These non-thermal spectral components differ...
Blazar Gamma-Rays, Shock Acceleration, and the Extragalactic Background Light (2007)
Stecker, Floyd W., Baring, Matthew G., Summerlin, Errol J.
The observed spectra of blazars, their intrinsic emission, and the underlying populations of radiating particles are intimately related. The use of these sources as probes of the extragalactic...
Topical Issues for Particle Acceleration Mechanisms in Astrophysical Shocks (2006)
Particle acceleration at plasma shocks appears to be ubiquitous in the universe, spanning systems in the heliosphere, supernova remnants, and relativistic jets in distant active galaxies and...
Resonant Compton Upscattering in Anomalous X-ray Pulsars (2006)
Baring, Matthew G., Harding, Alice K.
A significant new development in the study of Anomalous X-ray Pulsars (AXPs) has been the recent discovery by INTEGRAL and RXTE of flat, hard X-ray components in three AXPs. These non-thermal...
Electrostatic Potentials in Supernova Remnant Shocks (2006)
Baring, Matthew G., Summerlin, Errol J.
Recent advances in the understanding of the properties of supernova remnant shocks have been precipitated by the Chandra and XMM X-ray Observatories, and the HESS Atmospheric Cerenkov Telescope in...
Temporal Evolution of Pair Attenuation Signatures in Gamma-Ray Burst Spectra (2006)
The spectra obtained above 100 MeV by the EGRET experiment aboard the Compton Gamma-Ray Observatory for a handful of gamma-ray bursts has given no indication of any spectral attenuation that might...
Diffusive Acceleration of Ions at Interplanetary Shocks (2005)
Baring, Matthew G., Summerlin, Errol J.
Heliospheric shocks are excellent systems for testing theories of particle acceleration in their environs. These generally fall into two classes: (1) interplanetary shocks that are linear in their...
Modeling Accelerated Pick-up Ion Distributions at an Interplanetary Shock (2005)
Summerlin, Errol J., Baring, Matthew G.
The acceleration of interstellar pick-up ions as well as solar wind species has been observed at a multitude of interplanetary (IP) shocks by different spacecraft. The efficiency of injection of the...
Spin-Dependent Cyclotron Decay Rates in Strong Magnetic Fields (2005)
Baring, Matthew G., Gonthier, Peter L., Harding, Alice K.
Cyclotron decay and absorption rates have been well studied in the literature, focusing primarily on spectral, angular and polarization dependence. Astrophysical applications usually do not require...
Multiwavelength Spectral Models for SNR G347.3-0.5 from Non-Linear Shock Acceleration (2005)
Baring, Matthew G., Ellison, Donald C., Slane, Patrick O.
The remnant G347.3-0.5 exhibits strong shell emission in the radio and X-ray bands, and has a purported detection in the TeV gamma-ray band by the CANGAROO-II telescope. The CANGAROO results were...
Gamma-Ray Burst Prompt Emission: Implications from Shock Acceleration Theory (2005)
The principal paradigm for gamma-ray bursts suggest that the prompt transient gamma-ray signal arises from multiple shocks internal to the relativistic expansion. This paper illustrates some...
A Study of Prompt Emission Mechanisms in Gamma-Ray Bursts (2004)
Baring, Matthew G., Braby, Matthew L.
The principal paradigm for the prompt emission of gamma-ray bursts invokes diffusive acceleration at shocks internal to the dynamic ultrarelativistic outflow. This paper explores expectations for...
Quiescent Magnetar Emission: Resonant Compton Upscattering (2003)
A principal candidate for quiescent non-thermal gamma-ray emission from magnetars is resonant inverse Compton scattering in the strong fields of their magnetospheres. This paper outlines expectations...
High-Energy Emission from Pulsars: The Polar Cap Scenario (2003)
The study of pulsars in the three and a half decades since their discovery has highlighted a handful of issues critical to their understanding. To date there is no consensus on the physical mechanism...
Magnetohydrodynamic Jump Conditions for Oblique Relativistic Shocks with Gyrotropic Pressure (2003)
Double, Glen P., Baring, Matthew G., Jones, Frank C., Ellison, Donald C.
Shock jump conditions are obtained for steady-state, plane shocks with oblique magnetic fields and arbitrary flow speeds. For ultrarelativistic and nonrelativistic shocks, the jump conditions may be...
Identifying the Mysterious EGRET Sources: Signatures of Polar Cap Pulsar Models (2001)
The advent of the next generation of gamma-ray experiments, led by GLAST, AGILE, INTEGRAL and a host of atmospheric \v{C}erenkov telescopes coming on line in the next few years, will enable...
Photon Splitting and Pair Creation in Highly Magnetized Pulsars (2000)
Baring, Matthew G., Harding, Alice K.
The absence of radio pulsars with long periods has lead to the popular notion of a high P ``death line.'' In the standard picture, beyond this boundary, pulsars with low spin rates cannot accelerate...
Gonthier, Peter L., Harding, Alice K., Baring, Matthew G., Costello, Rachel M., Mercer, Cassandra L.
This paper explores the effects of strong magnetic fields on the Compton scattering of relativistic electrons. Recent studies of upscattering and energy loss by relativistic electrons that have used...
Magnetic Photon Splitting: the S-Matrix Formulation in the Landau Representation (2000)
Calculations of reaction rates for the third-order QED process of photon splitting in strong magnetic fields traditionally have employed either the effective Lagrangian method or variants of...
Nonlinear Shock Acceleration and Photon Emission in Supernova Remnants (2000)
Ellison, Donald C., Berezhko, Evgeny G., Baring, Matthew G.
We have extended a simple model of nonlinear diffusive shock acceleration (Berezhko and Ellison 1999) to include the injection and acceleration of electrons and the production of photons from...
Cosmic Ray Origin, Acceleration and Propagation (1999)
This paper summarizes highlights of the OG3.1, 3.2 and 3.3 sessions of the XXVIth International Cosmic Ray Conference in Salt Lake City, which were devoted to issues of origin/composition,...
Modelling Hard Gamma-Ray Emission From Supernova Remnants (1999)
The observation by the CANGAROO experiment of TeV emission from SN 1006, in conjunction with several instances of non-thermal X-ray emission from supernova remnants, has led to inferences of...
High-Energy Spectral Signatures in Gamma-Ray Bursts (1999)
One of the principal results obtained by the EGRET experiment aboard the Compton Gamma-Ray Observatory (CGRO) was the detection of several Gamma-ray bursts (GRBs) above 100 MeV. The broad-band...
Ellison, Donald C., Goret, Philippe, Baring, Matthew G., Grenier, Isabelle A., Lagage, Pierre-Olivier
We calculate particle spectra and continuum photon emission from the Cassiopeia A supernova remnant (SNR). The particle spectra, ion and electron, result from diffusive shock acceleration at the...
The Production of Anomalous Cosmic Rays by the Solar Wind Termination Shock (1999)
Jones, Frank C., Baring, Matthew G., Ellison, Donald C.
We have modeled the injection and acceleration of pickup ions at the solar wind termination shock and investigated the parameters needed to produce the observed Anomalous Cosmic Ray (ACR) fluxes. A...
Photon Attenuation and Pair Creation in Highly-Magnetized Pulsars (1999)
Baring, Matthew G., Harding, Alice K.
Developments over the last couple of years have supported the interpretation that anomalous X-ray pulsars (AXPs) and soft gamma repeaters (SGRs) possess unusually high magnetic fields, and...
Acceleration at Relativistic Shocks in Gamma-Ray Bursts (1999)
Most recent extragalactic models of gamma-ray bursts consider the expansion of a relativistic blast wave, emanating from a solar-mass type progenitor, into the surrounding interstellar medium as the...
Inverse Bremsstrahlung in Shocked Astrophysical Plasmas (1999)
Baring, Matthew G., Jones, Frank C., Ellison, Donald C.
There has recently been interest in the role of inverse bremsstrahlung, the emission of photons by fast suprathermal ions in collisions with ambient electrons possessing relatively low velocities, in...
Baring, Matthew G., Ellison, Donald C., Reynolds, Stephen P., Grenier, Isabelle, Goret, Philippe
Supernova remnants (SNRs) are widely believed to be the principal source of galactic cosmic rays. Such energetic particles can produce gamma-rays and lower energy photons via interactions with the...
Highly-Magnetized Pulsars and Integral (1998)
Baring, Matthew G., Harding, Alice K.
The complete absence of radio pulsars with periods exceeding a few seconds has lead to the popular notion of the existence of a high period death line. We have recently postulated the existence of...
Ellison, Donald C., Jones, Frank C., Baring, Matthew G.
We have modeled the injection and acceleration of pickup ions at the solar wind termination shock and investigated the parameters needed to produce the observed Anomalous Cosmic Ray (ACR) fluxes. A...
Radio Quiet Pulsars with Ultra-Strong Magnetic Fields (1998)
Baring, Matthew G., Harding, Alice K.
The notable absence of radio pulsars having measured magnetic dipole surface field strengths above $B_0\sim 3\times 10^{13}$ Gauss naturally raises the question of whether this forms an upper limit...
Jones, Frank C., Jokipii, J. Randy, Baring, Matthew G.
We give a rigorous derivation of a theorem showing that charged particles in an arbitrary electromagnetic field with at least one ignorable spatial coordinate remain forever tied to a given...
Gamma-Ray Bursts Above 1 GeV (1997)
One of the principal results obtained by the Compton Gamma Ray Observatory relating to the study of gamma-ray bursts was the detection by the EGRET instrument of energetic ($>$100 MeV) photons from a...
Shock Acceleration and Gamma-Ray Emitting Supernova Remnants (1997)
Baring, Matthew G., Ellison, Donald C., Reynolds, Stephen P., Grenier, Isabelle A., Goret, Philippe
Diffusive shock acceleration in the environs of a remnant's expanding shell is a popular candidate for the origin of SNR gamma-rays. In this paper, results from our study of non-linear effects in...
The Escape of High-Energy Photons from Gamma-Ray Bursts (1997)
Baring, Matthew G., Harding, Alice K.
Eleven bright gamma-ray bursts (GRBs) detected by BATSE have also been seen at much higher energies by EGRET, six at energies above 10 MeV. Such observations imply that these bursts are optically...
A New Class of Radio Quiet Pulsars (1997)
Baring, Matthew G., Harding, Alice K.
The complete absence of radio pulsars with periods exceeding a few seconds has lead to the popular notion of the existence of a high $P$ death line. In the standard picture, beyond this boundary,...
Supernova Remnants and Plerions in the Compton Gamma-Ray Observatory Era (1997)
De Jager, Ocker C., Baring, Matthew G.
Due to observations made by the Compton Gamma-Ray Observatory over the last six years, it appears that a number of galactic supernova remnants may be candidates for sources of cosmic gamma-rays....
Gamma-ray Production in Supernova Remnants (1997)
Supernova remnants are widely believed to be a principal source of galactic cosmic rays, produced by diffusive shock acceleration in the environs of the remnant's expanding shock. This review...
Diffusive Shock Acceleration: the Fermi Mechanism (1997)
The mechanism of diffusive Fermi acceleration at collisionless plasma shock waves is widely invoked in astrophysics to explain the appearance of non-thermal particle populations in a variety of...
Supernova Remnants and Plerions in the Compton Gamma-Ray Observatory Era (1997)
. Quite a number of supernova remnants appear to be gamma-ray sources. These include shell-type remnants such as IC443 and fl Cygni which have no known parent pulsars but have significant...
Magnetic Photon Splitting: Computations of Proper-time Rates and Spectra (1997)
Baring, Matthew G., Harding, Alice K.
The splitting of photons in the presence of an intense magnetic field has recently found astrophysical applications in polar cap models of gamma-ray pulsars and in magnetar scenarios for soft gamma...
Gamma-Rays from Supernova Remnants and the Signatures of Diffusive Shock Acceleration (1997)
Baring, Matthew G., Ellison, Donald C., Grenier, Isabelle
While the definitive detection of gamma-rays from known supernova remnants (SNRs) remains elusive, the collection of unidentified EGRET sources that may be associated with SNRs has motivated recent...
The Attenuation of Gamma-Ray Emission in Strongly-Magnetized Pulsars (1997)
Baring, Matthew G., Harding, Alice K., Gonthier, Peter L.
Gamma-rays from pulsars can be efficiently attenuated in their magnetospheres via the mechanism of single-photon pair production and also the exotic QED process of photon splitting, which become...
Baring, Matthew G., Harding, Alice K.
Relativistic bulk motion with large Lorentz factors has recently been inferred for gamma-ray bursts regardless of whether they are of galactic or cosmological origin. This conclusion results from...
Baring, Matthew G., Ogilvie, Keith, Ellison, Donald, Forsyth, Robert
The most stringent test of theoretical models of the first-order Fermi mechanism at collisionless astrophysical shocks is a comparison of the theoretical predictions with observational data on...
Non-linear Particle Acceleration in Oblique Shocks (1996)
Ellison, Donald C., Baring, Matthew G., Jones, Frank C.
We have developed a Monte Carlo technique for self-consistently calculating the hydrodynamic structure of oblique, steady-state shocks, together with the first-order Fermi acceleration process and...
Photon Splitting Cascades in Gamma-Ray Pulsars and the Spectrum of PSR1509-58 (1996)
Harding, Alice K., Baring, Matthew G., Gonthier, Peter L.
Magnetic photon splitting, a QED process that becomes important only in magnetic fields approaching the quantum critical value, B_cr = 4.41 X 10^13 Gauss, is investigated as a mechanism for...
A Photon Splitting Cascade Model of Soft Gamma-Ray Repeaters (1996)
Harding, Alice K., Baring, Matthew G.
The spectra of soft gamma-ray repeaters (SGRs), with the exception of the March 5, 1979 main burst, are characterized by high-energy cutoffs around 30 keV and low-energy turnovers that are much...