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Pair-Instability Supernovae at the Epoch of Reionization
Tony Pan, Daniel Kasen, Abraham Loeb
Pristine stars with masses between ~140 and 260 M_sun are theoretically predicted to die as pair-instability supernovae. These very massive progenitors could come from Pop III star…
Constraining Sources of Ultra High Energy Cosmic Rays Using High Energy Observations with the Fermi Satellite
Asaf Pe'er, Abraham Loeb
We analyze the conditions that enable acceleration of particles to ultra-high energies, ~10^{20} eV (UHECRs). We show that broad band photon data recently provided by WMAP, ISOCAM,…
Pair-Instability Supernovae via Collision Runaway in Young Dense Star Clusters
Tony Pan, Abraham Loeb, Daniel Kasen
Stars with helium cores between ~64 and 133 M_sun are theoretically predicted to die as pair-instability supernovae. This requires very massive progenitors, which are theoretically…
Observing Lense-Thirring Precession in Tidal Disruption Flares
Nicholas Stone, Abraham Loeb
When a star is tidally disrupted by a supermassive black hole (SMBH), the streams of liberated gas form an accretion disk after their return to pericenter. We demonstrate that Lens…
The Birth of a Relativistic Outflow in the Unusual γ-ray Transient Swift J164449.3+573451
B. A. Zauderer, E. Berger, A. M. Soderberg +24
Active galactic nuclei (AGN), powered by long-term accretion onto central supermassive black holes, produce relativistic jets with lifetimes of greater than one million yr that pre…
Constraining the Structure of Sagittarius A*'s Accretion Flow with Millimeter-VLBI Closure Phases
Avery E. Broderick, Vincent L. Fish, Sheperd S. Doeleman +1
Millimeter wave Very Long Baseline Interferometry (mm-VLBI) provides access to the emission region surrounding Sagittarius A*, the supermassive black hole at the center of the Milk…
Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI
Avery E. Broderick, Abraham Loeb, Mark J. Reid
With the advent of the Event Horizon Telescope (EHT), a millimeter/sub-millimeter very-long baseline interferometer (VLBI), it has become possible to image a handful of black holes…
Supernova Shock Breakout Through a Wind
Shmuel Balberg, Abraham Loeb
The breakout of a supernova shock wave through the progenitor star's outer envelope is expected to appear as an X-ray flash. However, if the supernova explodes inside an optically-…