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Positron flux and gamma-ray emission from Geminga pulsar and pulsar wind nebula
Xiaping Tang, Tsvi Piran
Nearby pulsars have been suggested as sources of TeV Cosmic Ray (CR) excess on Earth. The High-Altitude Water Cherenkov Observatory (HAWC) detected extended TeV emi…
Cosmic-Ray Anisotropy from Large Scale Structure and the effect of magnetic horizons
Noémie Globus, Tsvi Piran, Yehuda Hoffman +2
Motivated by the ~7 % dipole anisotropy in the distribution of ultra-high energy cosmic-rays (UHECRs) above 8 EeV, we explore the anisotropy induced by the large scale structure, u…
Constraints on the emitting region of the gamma-rays observed in GW170817
Tatsuya Matsumoto, Ehud Nakar, Tsvi Piran
The gravitational waves from the neutron star merger event GW170817 were accompanied by an unusually weak short GRB 170817A, by an optical/IR macronova/kilonova and by a long lasti…
Who Ordered That? On The Origin of LIGO's Merging Binary Black Holes
Tsvi Piran, Kenta Hotokezaka
LIGO's detection of gravitational waves from binary black hole mergers was an unexpected surprise that immediately raised the question - what is the origin of these black hole bina…
From to Radio - The Electromagnetic Counterpart of GW 170817
Ehud Nakar, Ore Gottlieb, Tsvi Piran +2
The gravitational waves from the first binary neutron star merger, GW170817, were accompanied by a multi-wavelength electromagnetic counterpart, from -rays to radio. The accompa…
Synchrotron radiation from the fast tail of dynamical ejecta of neutron star mergers
Kenta Hotokezaka, Kenta Kiuchi, Masaru Shibata +2
We find, using high resolution numerical relativistic simulations, that the tail of the dynamical ejecta of neutron star mergers extends to mildly relativistic velocities faster th…