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18 papers · 2 filters
FRB 121102 Bursts Show Complex Time-Frequency Structure
J. W. T. Hessels, L. G. Spitler, A. D. Seymour +23
FRB 121102 is the only known repeating fast radio burst source. Here we analyze a wide-frequency-range (1-8 GHz) sample of high-signal-to-noise, coherently dedispersed bursts detec…
Very High-Energy Emission from the Direct Vicinity of Rapidly Rotating Black Holes
Kouichi Hirotani
When a black hole accretes plasmas at very low accretion rate, an advection-dominated accretion flow (ADAF) is formed. In an ADAF, relativistic electrons emit soft gamma-rays via B…
Parabolic Jets from the Spinning Black Hole in M87
Masanori Nakamura, Keiichi Asada, Kazuhiro Hada +18
The M87 jet is extensively examined by utilizing general relativistic magnetohydrodynamic (GRMHD) simulations as well as the steady axisymmetric force-free electrodynamic (FFE) sol…
ALMA Polarimetry of Sgr A*: Probing the Accretion Flow from the Event Horizon to the Bondi Radius
Geoffrey C. Bower, Avery Broderick, Jason Dexter +10
Millimeter polarimetry of Sgr A* probes the linearly polarized emission region on a scale of Schwarzschild radii () as well as the dense, magnetized accretion flow o…
High-energy and very-high-energy emission from stellar-mass black holes moving in gaseous clouds
Kouichi Hirotani, Hung-Yi Pu, Sabrina Outmani +5
We investigate the electron-positron pair cascade taking place in the magnetosphere of a rapidly rotating black hole. Because of the spacetime frame dragging, the Goldreich-Julian…
A Detailed Study of the Most Relaxed SPT-Selected Galaxy Clusters: Cool Core and Central Galaxy Properties
M. McDonald, S. W. Allen, J. Hlavacek-Larrondo +14
We present a multi-wavelength analysis of the four most relaxed clusters in the South Pole Telescope 2500 deg^2 survey, which lie at 0.55 < z < 0.75. This study, which utilizes new…