output
19922026
Showing 2011 · astro-ph.HEShow all

15 papers · 2 filters

astro-ph.HE2011★ 200 cited

Gamma-ray Activity in the Crab Nebula: The Exceptional Flare of April 2011

R. Buehler, J. D. Scargle, R. D. Blandford +18

The Large Area Telescope on board the Fermi satellite observed a gamma-ray flare in the Crab nebula lasting for approximately nine days in April of 2011. The source, which at optic…

astro-ph.HE2011★ 56 cited

Magnetic Field Generation and Particle Energization at Relativistic Shear Boundaries in Collisionless Electron-Positron Plasmas

Edison Liang, Markus Boettcher, Ian Smith

Using 2.5-dimensional Particle-in-Cell simulations, we study the kinetic physics of relativistic shear flow boundary in collisionless electron-positron (e+e-) plasmas. We find effi…

astro-ph.HE2011★ 154 cited

Diffusive Acceleration of Particles at Oblique, Relativistic, Magnetohydrodynamic Shocks

Errol J. Summerlin, Matthew G. Baring

Diffusive shock acceleration (DSA) at relativistic shocks is expected to be an important acceleration mechanism in a variety of astrophysical objects including extragalactic jets i…

astro-ph.HE2011★ 30 cited

Observations of Energetic High Magnetic Field Pulsars with the Fermi Large Area Telescope

D. Parent, M. Kerr, P. R. Den Hartog +27

We report the detection of gamma-ray pulsations from the high-magnetic-field rotation-powered pulsar PSR J1119-6127 using data from the Fermi Large Area Telescope. The gamma-ray li…

astro-ph.HE2011★ 45 cited

Burst and Persistent Emission Properties during the Recent Active Episode of the Anomalous X-ray Pulsar 1E 1841-045

Lin Lin, Chryssa Kouveliotou, Ersin Gogus +19

Swift/BAT detected the first burst from 1E 1841-045 in May 2010 with intermittent burst activity recorded through at least July 2011. Here we present Swift and Fermi/GBM observatio…

astro-ph.HE2011★ 9 cited

Numerical Modeling of Multi-wavelength Spectra of M87 Core Emission

Guy Hilburn, Edison Liang

Spectral fits to M87 core data from radio to hard x-ray are generated via a specially selected software suite, comprised of the HARM GRMHD accretion disk model and a 2D Monte Carlo…

astro-ph.HE2011★ 44 cited

Constraints on the Synchrotron Shock Model for the Fermi GBM Gamma-Ray Burst 090820A

J. Michael Burgess, Robert D. Preece, Matthew G. Baring +25

Discerning the radiative dissipation mechanism for prompt emission in Gamma-Ray Bursts (GRBs) requires detailed spectroscopic modeling that straddles the peak in the 100 keV…

astro-ph.HE2011★ 56 cited

Fermi/GBM Observations of SGR J0501+4516 Bursts

Lin Lin, Chryssa Kouveliotou, Matthew G. Baring +27

We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope during the 13…

astro-ph.HE2011★ 68 cited

Time dependent simulations of multiwavelength variability of the blazar Mrk 421 with a Monte Carlo multi-zone code

Xuhui Chen, Giovanni Fossati, Edison Liang +1

(abridged) We present a new time-dependent multi-zone radiative transfer code and its application to study the SSC emission of Mrk 421. The code couples Fokker-Planck and Monte Car…

astro-ph.HE2011

X-ray Time Lags in TeV Blazars

Xuhui Chen, Giovanni Fossati, Edison Liang +1

We use Monte Carlo/Fokker-Planck simulations to study the X-ray time lags. Our results show that soft lags will be observed as long as the decay of the flare is dominated by radiat…

astro-ph.HE2011★ 41 cited

Detection of High-Energy Gamma-Ray Emission during the X-ray flaring activity in GRB100728A

The Fermi Collaboration, L. Piro

We present the simultaneous Swift and Fermi observations of the bright GRB100728A and its afterglow. The early X-ray emission is dominated by a vigorous flaring activity continuing…

astro-ph.HE2011★ 239 cited

Observations of the young supernova remnant RX J1713.7-3946 with the Fermi Large Area Telescope

A. A. Abdo, Fermi LAT Collaboration

We present observations of the young Supernova remnant (SNR) RX J1713.7-3946 with the Fermi Large Area Telescope (LAT). We clearly detect a source positionally coincident with the…

astro-ph.HE2011★ 32 cited

Cooling Rates for Relativistic Electrons Undergoing Compton Scattering in Strong Magnetic Fields

Matthew G. Baring, Zorawar Wadiasingh, Peter L. Gonthier

For inner magnetospheric models of hard X-ray and gamma-ray emission in high-field pulsars and magnetars, resonant Compton upscattering is anticipated to be the most efficient proc…

astro-ph.HE2011★ 227 cited

Detection of a spectral break in the extra hard component of GRB 090926A

Fermi-LAT, Fermi-GBM collaborations

We report on the observation of the bright, long gamma-ray burst, GRB 090926A, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on board the \Fermi\…

astro-ph.HE2011★ 138 cited

Similarity of the Optical-IR and Gamma-Ray Time Variability of Fermi Blazars

Ritaban Chatterjee, C. Bailyn, E. W. Bonning +6

We present the time variability properties of a sample of six blazars, AO 0235+164, 3C 273, 3C 279, PKS 1510-089, PKS 2155-304, and 3C 454.3, at optical-IR as well as gamma-ray ene…