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Cosmological constraints from 21cm surveys after reionization
Eli Visbal, Abraham Loeb, Stuart Wyithe
21cm emission from residual neutral hydrogen after the epoch of reionization can be used to trace the cosmological power spectrum of density fluctuations. Using a Fisher matrix for…
The Race Between Stars and Quasars in Reionizing Cosmic Hydrogen
Abraham Loeb
The cosmological background of ionizing radiation has been dominated by quasars once the Universe aged by ~2 billion years. At earlier times (redshifts z>3), the observed abundance…
Constraints on the Local Sources of Ultra High-Energy Cosmic Rays
Eli Waxman, Abraham Loeb
Ultra high-energy cosmic rays (UHECRs) are believed to be protons accelerated in magnetized plasma outflows of extra-Galactic sources. The acceleration of protons to ~10^{20} eV re…
Star Clusters Around Recoiled Black Holes in the Milky Way Halo
Ryan M. O'Leary, Abraham Loeb
Gravitational wave emission by coalescing black holes (BHs) kicks the remnant BH with a typical velocity of hundreds of km/s. This velocity is sufficiently large to remove the remn…
Implications of Recent Measurements of the Milky Way Rotation for the Orbit of the Large Magellanic Cloud
Genevieve Shattow, Abraham Loeb
We examine the implications of recent measurements of the Milky Way rotation for the trajectory of the Large Magellanic Cloud. The ~ 14+/-6% increase in the MW circular velocity re…
Detecting Flaring Structures in Sagittarius A* with (Sub)Millimeter VLBI
Vincent L. Fish, Sheperd S. Doeleman, Avery E. Broderick +2
Multiwavelength monitoring observations of Sagittarius A* exhibit variability on timescales of minutes to hours, indicating emission regions localized near the event horizon. (Sub)…