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17 papers · 2 filters
Stability of an Ultra-Relativistic Blast Wave in an External Medium with a Steep Power-Law Density Profile
Xiaohu Wang, Abraham Loeb, Eli Waxman
We examine the stability of self-similar solutions for an accelerating relativistic blast wave which is generated by a point explosion in an external medium with a steep radial den…
Low-Frequency Gravitational Waves from Massive Black Hole Binaries: Predictions for LISA and Pulsar Timing Arrays
J. Stuart B. Wyithe, Abraham Loeb
The coalescence of massive black hole (BH) binaries due to galaxy mergers provides a primary source of low-frequency gravitational radiation detectable by pulsar timing measurement…
Spectral Signature of Cosmological Infall of Gas Around the First Quasars
Rennan Barkana, Abraham Loeb
Recent observations have shown that, only a billion years after the Big Bang, the Universe was already lit up by bright quasars fuelled by the infall of gas onto supermassive black…
Reionization of Hydrogen and Helium by Early Stars and Quasars
Stuart Wyithe, Abraham Loeb
We compute the reionization histories of hydrogen and helium due to the ionizing radiation fields produced by stars and quasars. For the quasars we use a model based on halo-merger…
The 21 cm Forest: Radio Absorption Spectra as Probes of Minihalos Before Reionization
Steven Furlanetto, Abraham Loeb
We study the absorption along lines of sight toward high-z radio sources caused by the 21 cm transition of neutral hydrogen in the intergalactic medium (IGM) before reionization. U…
Constraints on the Collisional Nature of the Dark Matter from Gravitational Lensing in the Cluster A2218
Priyamvada Natarajan, Abraham Loeb, Jean-Paul Kneib +1
The detailed distribution of mass within clusters of galaxies can be used to probe the nature of dark matter. We show that constraints on the extent of the mass distribution around…