Bykov, Andrei M., Uvarov, Yury A., Ellison, Donald C.
Non-thermal X-ray emission in some supernova remnants originates from synchrotron radiation of ultra-relativistic particles in turbulent magnetic fields. We address the effect of a random magnetic...
Vladimirov, Andrey E., Bykov, Andrei M., Ellison, Donald C.
The highly amplified magnetic fields suggested by observations of some supernova remnant (SNR) shells are most likely an intrinsic part of efficient particle acceleration by shocks. This strong...
Lee, Shiu-Hang, Kamae, Tsuneyoshi, Ellison, Donald C.
We present a 3-dimensional model of supernova remnants (SNRs) where the hydrodynamical evolution of the remnant is modeled consistently with nonlinear diffusive shock acceleration occuring at the...
Magnetic Field Amplification and Rapid Time Variations in SNR RX J1713.7-3946 (2007)
Ellison, Donald C., Vladimirov, Andrey
Evidence is accumulating suggesting that collisionless shocks in supernova remnants (SNRs) can amplify the interstellar magnetic field to hundreds of microgauss or even milli-gauss levels, as...
Ellison, Donald C., Patnaude, Daniel J., Slane, Patrick, Blasi, Pasquale, Gabici, Stefano
If highly efficient, cosmic ray production can have a significant effect on the X-ray emission from SNRs as well as their dynamical evolution. Using hydrodynamical simulations including diffusive...
Ellison, Donald C., Patnaude, Daniel J., Slane, Patrick, Blasi, Pasquale, Gabici, Stefano
Efficient cosmic-ray production can have a significant effect on the evolution and X-ray emission from SNRs. Using hydrodynamic simulations coupled to diffusive shock acceleration, we produce thermal...
When Do Ultra-relativistic Shocks Make Energetic Particle Populations? (2006)
Eichler, David, Ellison, Donald C.
This paper has been withdrawn by the authors due to missing references to earlier work and an error in the interpretation of Figures 2 and 3. A corrected version is in preparation.
Nonlinear Diffusive Shock Acceleration with Magnetic Field Amplification (2006)
Vladimirov, Andrey, Ellison, Donald C., Bykov, Andrei
We introduce a Monte Carlo model of nonlinear diffusive shock acceleration allowing for the generation of large-amplitude magnetic turbulence. The model is the first to include strong wave...
Nonlinear Particle Acceleration at Reverse Shocks in Supernova Remnants (2005)
Ellison, Donald C., Decourchelle, Anne, Ballet, Jean
Without amplification, magnetic fields in expanding ejecta of young supernova remnants (SNRs) will be orders of magnitude below those required to shock accelerate thermal electrons, or ions, to...
Morphology of synchrotron emission in young supernova remnants (2005)
Cassam-Chenai, Gamil, Decourchelle, Anne, Ballet, Jean, Ellison, Donald C.
In the framework of test-particle and cosmic-ray modified hydrodynamics, we calculate synchrotron emission radial profiles in young ejecta-dominated supernova remnants (SNRs) evolving in an ambient...
Thermal Particle Injection in Nonlinear Diffusive Shock Acceleration (2005)
Ellison, Donald C., Blasi, Pasquale, Gabici, Stefano
Particle acceleration in collisionless astrophysical shocks, i.e., diffusive shock acceleration (DSA), is the most likely mechanism for producing cosmic rays, at least below 10^{15} eV. Despite the...
Test-Particle Diffusive Shock Acceleration in Relativistic Shocks (2005)
We present results from a fully relativistic Monte Carlo simulation of diffusive shock acceleration (DSA) in unmodified (i.e., test-particle) shocks. The computer code uses a single algorithmic...
Efficient Cosmic Ray Ion Production in Young Supernova Remnants (2005)
Ellison, Donald C., Cassam-Chenai, Gamil
The strong shocks in young supernova remnants (SNRs) should accelerate cosmic rays (CRs) and no doubt exists that relativistic electrons are produced in SNRs. However, direct evidence that SNRs...
Radio and X-ray Profiles in Supernova Remnants Undergoing Efficient Cosmic Ray Production (2005)
Ellison, Donald C., Cassam-Chenai, Gamil
The strong shocks in young supernova remnants (SNRs) should accelerate cosmic rays (CRs) and no doubt exists that \rel electrons are produced in SNRs. However, direct and convincing evidence that...
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...
Nonlinear Particle Acceleration at Reverse Shocks in Supernova Remnants (2004)
Ellison, Donald C., Decourchelle, Anne, Ballet, Jean
Without amplification, magnetic fields in expanding ejecta of young supernova remnants (SNRs) will be orders of magnitude below those required to shock accelerate thermal electrons, or ions, to...
Diffusive Shock Acceleration in Unmodified Relativistic, Oblique Shocks (2004)
Ellison, Donald C., Double, Glen P.
We present results from a fully relativistic Monte Carlo simulation of diffusive shock acceleration (DSA) in unmodified shocks. The computer code uses a single algorithmic sequence to smoothly span...
Nonlinear Particle Acceleration at Reverse Shocks in Supernova Remnants (2004)
Ellison, Donald C., Decourchelle, Anne, Ballet, Jean
Without amplification, magnetic fields in expanding ejecta of young supernova remnants (SNRs) will be orders of magnitude below those required to shock accelerate thermal electrons, or ions, to...
Nonlinear Particle Acceleration at Reverse Shocks in Supernova Remnants (2004)
Ellison, Donald C., Decourchelle, Anne, Ballet, Jean
Without amplification, magnetic fields in expanding ejecta of young supernova remnants (SNRs) will be orders of magnitude below those required to shock accelerate thermal electrons, or ions, to...
Hydrodynamic Simulation of Supernova Remnants Including Efficient Particle Acceleration (2003)
Ellison, Donald C., Decourchelle, Anne, Ballet, Jean
A number of supernova remnants (SNRs) show nonthermal X-rays assumed to be synchrotron emission from shock accelerated TeV electrons. The existence of these TeV electrons strongly suggests that the...
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...
Nonlinear Particle Acceleration in Relativistic Shocks (2002)
Ellison, Donald C., Double, Glen P.
Monte Carlo techniques are used to model nonlinear particle acceleration in parallel collisionless shocks of various speeds, including mildly relativistic ones. When the acceleration is efficient,...
Broad-band Observations and Modeling of the Shell-Type Supernova Remnant G347.3-0.5 (2001)
Ellison, Donald C., Slane, Patrick, Gaensler, Bryan M.
The supernova remnant G347.3--0.5 emits a featureless power-law in X-rays, thought to indicate shock-acceleration of electrons to high energies. We here produce a broad-band spectrum of the bright NW...
Blondin, John M., Ellison, Donald C.
We employ hydrodynamic simulations to study the effects of high shock compression ratios, as expected for fast shocks with efficient particle acceleration, on the convective instability of driven...
Cosmic-ray production in young supernova remnant (SNR) shocks is expected to be efficient and strongly nonlinear. In nonlinear, diffusive shock acceleration, compression ratios will be higher and the...
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...
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...
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...
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...
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...
Galactic Cosmic Rays from Supernova Remnants: II Shock Acceleration of Gas and Dust (1997)
Ellison, Donald C., Drury, L. O'C., Meyer, Jean-Paul
This is the second paper (the first was astro-ph/9704267) of a series analysing the Galactic Cosmic Ray (GCR) composition and origin. In this we present a quantitative model of GCR origin and...
Meyer, Jean-Paul, Drury, L. O'C., Ellison, Donald C.
This is the first of a series of papers analysing the Galactic Cosmic Ray composition and origin. We show that the Galactic Cosmic Ray source (GCRS) composition is best described in terms of (i) a...
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...
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...