A5083272754- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Neutrino Physics Research
- Astro and Planetary Science
- Astrophysical Phenomena and Observations
- Ionosphere and magnetosphere dynamics
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Astronomy and Astrophysical Research
- High-pressure geophysics and materials
- Particle physics theoretical and experimental studies
- Galaxies: Formation, Evolution, Phenomena
- Radio Astronomy Observations and Technology
- Geomagnetism and Paleomagnetism Studies
- Atomic and Subatomic Physics Research
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Particle Accelerators and Free-Electron Lasers
Ben-Gurion University of the Negev
2013-2023
Laboratoire des Sciences de l'Ingénieur, de l'Informatique et de l'Imagerie
2016
University of Potsdam
2011
Special Astrophysical Observatory
2004
University of California, Santa Barbara
1997
University of Maryland, College Park
1982-1996
University of Chicago
1977-1996
Fermi National Accelerator Laboratory
1978-1996
Friedrich Schiller University Jena
1990
Weizmann Institute of Science
1982
view Abstract Citations (319) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Cosmic ray drift, shock wave acceleration, and the anomalous component of cosmic rays Pesses, M. E. ; Jokipii, J. R. Eichler, D. A model quiet-time flux is presented in which ex-interstellar neutral particles are accelerated continuously polar regions solar-wind termination then drift into equatorial inner heliosphere. The observed solar-cycle variations, radial...
view Abstract Citations (339) References (59) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Particle Acceleration and Nonthermal Radio Emission in Binaries of Early-Type Stars Eichler, D. ; Usov, V. It is shown that the stellar wind collisions early-type binaries may be strong sources both high-energy particles nonthermal emission. radio emission observed only if orbital period binary more than some critical value. For a typical Wolf-Rayet value order month...
view Abstract Citations (196) References (50) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Monte Carlo shock-like solutions to the Boltzmann equation with collective scattering Ellison, D. C. ; Eichler, The results of simulations steady state shocks generated by a collision operator that isotropizes particles means elastic in some locally defined frame reference are presented. include both back reaction accelerated on inflowing plasma and free escape...
view Abstract Citations (184) References (6) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Particle acceleration in collisionless shocks: regulated injection and high efficiency. Eichler, D. supernova remnants radio galaxies proceeds with efficiency, at the same time puts out most of cosmic ray power moderately relativistic energies. This suggests that there is a mechanism selects only very small fraction particles thermal pool, but enough that, when...
We consider the possibility that dark matter is in form of charged massive particles. Several constraints are discussed: (a) absence heavy-hydrogen-like atoms water; (b) agreement between observed cosmic abundance elements and standard big-bang nucleosynthesis predictions; (c) properties galaxies, stars, planets; (d) their nonobservation $\ensuremath{\gamma}$-ray cosmic-ray detectors, lack radiation damage to space-borne electronic components. find integer-charged particles less than...
We investigate the free escape of ions from post shock plasma into region upstream a fast collisionless shock. find that accessibility downstream to depends strongly on magnetic field normal angle as well parameters. Post in significant numbers for angles below about 45°, rough accord with observed transition between quasi‐perpendicular and quasi‐parallel structure. also calculate ion distribution functions resemble those “intermediate” beams.
Afterglow observations are commonly used to determine the parameters of GRB explosions, energy E, surrounding density n, post-shock magnetic field equipartition fraction ε_B and electron ε_e, under frequently made assumption that efficiency "injection" into relativistic shock acceleration is high, i.e. f electrons which undergo f~1. We show value can not be determined by current observations, since currently testable model predictions for a parameter choice...
view Abstract Citations (77) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-energy neutrino astronomy: a probe of galactic nuclei? Eichler, D. The powerful infrared emission from active nuclei may be driven, directly or indirectly, by nonthermal processes, in which case the power high-energy particle production as high IR luminosity. galaxies contain, on various scales, enough matter to stop protons before they diffuse out nuclear region...
Many of the astrophysical sources and violent phenomena observed in our Universe are potential emitters gravitational waves high-energy cosmic radiation, including photons, hadrons, presumably also neutrinos. Both (GW) neutrinos (HEN) messengers that may escape much denser media than photons. They travel unaffected over cosmological distances, carrying information from inner regions engines which they emitted (and photons charged rays cannot reach us). For same reasons, such could reveal...
view Abstract Citations (114) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Baryon Purity in Cosmological Gamma-Ray Bursts as a Manifestation of Event Horizons Levinson, Amir ; Eichler, David The mass-loss rate driven by an electron-positron fireball created the late stages accretion-induced collapse or neutron star merging is calculated. It shown that solution connecting wind regime to hydrostatic has well-defined mass flux steady state....
view Abstract Citations (121) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Magnetic Confinement of Jets Eichler, David The familiar picture magnetic collimation jets is critiqued. Solutions are derived that explicitly demonstrate the asymptotically parabolic nature almost all stream lines, more or less consistent with previous discussions. It then shown too slow to be physically relevant when flow in its uncollimated state only weakly...
The hνpeak/100 keV ~ (Eiso/1052 ergs)1/2 correlation reported recently by Amati et al. and Lamb for long gamma-ray bursts can be interpreted as a viewing angle effect if the emitting region of fireball is ring-shaped.
view Abstract Citations (140) References (48) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Late Evolution of Very Low Mass X-Ray Binaries Sustained by Radiation from Their Primaries Ruderman, M. ; Shaham, J. Tavani, Eichler, D. The accretion-powered radiation the X-ray pulsar system Her X-1 (McCray et al. 1982) is studied. changes in soft and gamma-ray flux accompanying electron-positron wind are discussed. These believed to be associated with inward...
view Abstract Citations (113) References (31) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the ultrahigh-energy gamma rays from CYG X-3. Vestrand, W. T. ; Eichler, D. The way in which generation of (UHE) can be incorporated into a model Cyg X-3 system as young pulsar close binary is examined. It shown that observed UHE light curve naturally reproduced if companion's atmosphere acts target material for particles accelerated near pulsar. Clues radiation...
view Abstract Citations (84) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Energetic particle spectra in finite shocks - The earth's bow shock Eichler, D. Particle acceleration and escape at the wave are discussed order to account for reported exponential fast spectra. A model is presented of a two-dimensional perpendicular magnetic field, with parallel diffusion coefficients inversely proportional each other. It shown that energy per unit...
Cosmic ray (CR) sources leave signatures in the isotopic abundances of CRs. Current models Galactic CRs that consider supernovae (SNe) shocks as main sites particle acceleration cannot satisfactorily explain higher ${\rm ^{22}Ne/^{20}Ne}$ ratio compared to interstellar medium. Although stellar winds from massive stars have been invoked, their contribution relative SNe ejecta has taken a free parameter. Here we present theoretical calculation contributions wind termination (WTSs) and...
Transient X-ray emission, with an approximate t^{-0.7} decay, was observed from SGR 1900+14 over 40 days following the giant flare of 27 Aug 1998. We calculate in detail diffusion heat to surface a neutron star through intense 10^{14}-10^{15} G magnetic field, release energy its outer layers. show that power law index, fraction burst afterglow, and return persistent emission can all be understood if is composed normal baryonic material.
On 2004 Dec. 27, the soft gamma repeater (SGR) 1806-20 emitted brightest giant flare (GF) ever detected from an SGR, with (isotropic) energy release $\sim 100$ times greater than only two other known SGR GFs. It was followed by a very bright, fading radio afterglow. Extensive follow-up observations provided wealth of information unprecedented astrometric precision, revealing temporal evolution source size, along densely sampled light curves and spectra. Here we expand on our previous work...
view Abstract Citations (95) References (4) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the theory of cosmic-ray-mediated shocks with variable compression ratio Eichler, D. Cosmic-ray-mediated may accelerate enough cosmic rays to high energies that they escape shock, carrying an appreciable amount energy before being convected downstream infinity. Under such conditions, it is noted, overall cannot be determined from conservation equations as in...
Early X-ray afterglows recently detected by Swift frequently show a phase of very shallow flux decay lasting from ~102.5 up to ~104 s, followed steeper, more familiar decay. We suggest that the flat early part light curve may be combination (1) decaying tail prompt emission and (2) delayed onset afterglow observed viewing angles slightly outside edge jet generates prominent emission, as predicted previously. This would imply significant fraction viewers get little external shock energy along...
We investigate the temporal and spectral correlations between flux anisotropy fluctuations of TeV-band cosmic rays in light recent data taken with IceCube. find that for a conventional distribution cosmic-ray sources, dipole is higher than observed, even if source discreteness into account. Moreover, shallow galactic sources reacceleration model, arising from provide probability only order 10% limits IceCube analysis are met. This estimate nearly independent exact choice rate, but generous...