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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…
Imaging the Black Hole Silhouette of M87: Implications for Jet Formation and Black Hole Spin
Avery E. Broderick, Abraham Loeb
The silhouette cast by the horizon of the supermassive black hole in M87 can now be resolved with the emerging millimeter very-long baseline interferometry (VLBI) capability. Despi…
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…
Evidence for Merger-Driven Activity in the Clustering of High Redshift Quasars
Stuart Wyithe, Abraham Loeb
Recently, a very large clustering length has been measured for quasars at a redshift of z~4. In combination with the observed quasar luminosity function we assess the implications…
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…
Methods for detecting flaring structures in Sagittarius A* with high frequency VLBI
Sheperd S. Doeleman, Vincent L. Fish, Avery E. Broderick +2
The super massive black hole candidate, Sagittarius A*, exhibits variability from radio to X-ray wavelengths on time scales that correspond to < 10 Schwarzschild radii. We survey t…