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47 papers · 1 filter
The Sleeping Monster: NuSTAR observations of SGR 1806-20, 11 years after the Giant Flare
George Younes, Matthew G. Baring, Chryssa Kouveliotou +5
We report the analysis of 5 NuSTAR observations of SGR 1806-20 spread over a year from April 2015 to April 2016, more than 11 years following its Giant Flare (GF) of 2004. The sour…
The Effect of Pair Cascades on the High-Energy Spectral Cutoff in Gamma-Ray Bursts
Ramandeep Gill, Jonathan Granot
The highly luminous and variable prompt emission in Gamma-Ray Bursts (GRBs) arises in an ultra-relativistic outflow. The exact underlying radiative mechanism shaping its non-therma…
The High Frequency Radio Emission of the Galactic Center Magnetar SGR J1745-29 During a Transitional Period
Joseph D. Gelfand, Scott Ransom, Chryssa Kouveliotou +6
The origin of the high-frequency radio emission detected from several magnetars is poorly understood. In this paper, we report the ~40 GHz properties of SGR J1745-29 as measured us…
Toward understanding the physical underpinnings of spatial and spectral morphologies of pulsar wind nebulae
Oleg Kargaltsev, Noel Klingler, Sarah Chastain +1
We discuss the observational properties of pulsar wind nebulae (PWNe) linking them to the injected (at the termination shock) electron spectral energy distribution and parameters o…
Old but still warm: Far-UV detection of PSR B0950+08
G. G. Pavlov, B. Rangelov, O. Kargaltsev +3
We report on a Hubble Space Telescope detection of the nearby, old pulsar B0950+08 ( pc, spin-down age 17.5 Myr) in two far-ultraviolet (FUV) bands. We measured the me…
Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
E. Pian, P. D'Avanzo, S. Benetti +81
The merger of two neutron stars is predicted to give rise to three major detectable phenomena: a short burst of gamma-rays, a gravitational wave signal, and a transient optical/nea…