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Constraints on the bulk Lorentz factor of Gamma-Ray Burst jets from Fermi/LAT upper limits
L. Nava, R. Desiante, F. Longo +5
It is largely recognized that Gamma-Ray Burst (GRB) jets involve ultra-relativistic motion. However, the value of the Lorentz factor Gamma_0 is still not clear and only lower limit…
The Observable Signatures of GRB Cocoons
Ehud Nakar, Tsvi Piran
As a long GRB jet propagates within the surrounding stellar atmosphere it creates a cocoon composed of an outer Newtonian shocked stellar material and an inner (possibly relativist…
The effect of cooling on particle trajectories and acceleration in relativistic magnetic reconnection
Daniel Kagan, Ehud Nakar, Tsvi Piran
The maximum synchrotron burnoff limit of 160 MeV represents a fundamental limit to radiation resulting from electromagnetic particle acceleration in one-zone ideal plasmas. In magn…
Can we reconcile the TA excess and hotspot with Auger observations?
Noemie Globus, Denis Allard, Etienne Parizot +2
The Telescope Array (TA) shows a 20 hotspot as well as an excess of UHECRs above 50~EeV when compared with the Auger spectrum. We consider the possibility that both the T…
Evolution of Supernova Remnants near the Galactic Center
Almog Yalinewich, Tsvi Piran, Re'em Sari
Supernovae near the galactic center evolve differently from regular galactic supernovae. This is mainly due to the environment into which the supernova remnants propagate. Instead…
r-process Production Sites as inferred from Eu Abundances in Dwarf Galaxies
Paz Beniamini, Kenta Hotokezaka, Tsvi Piran
Recent observations of -process material in ultra-faint dwarf galaxies (UFDs) shed light on the sources of these elements. Strong upper limits on the Eu mass in some UFDs combin…