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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…
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 Multi-Band Magnification Bias for Gravitational Lenses
J. Stuart B. Wyithe, Joshua N. Winn, David Rusin
We present a generalization of the concept of magnification bias for gravitationally-lensed quasars, in which the quasars are selected by flux in more than one wavelength band. To…
A Physical Model for the Luminosity Function of High-Redshift Quasars
Stuart Wyithe, Abraham Loeb
We provide a simple theoretical model for the quasar luminosity function at high redshifts that naturally reproduces the statistical properties of the luminous SDSS quasar sample a…
Measuring the Size of Quasar Broad-Line Clouds Through Time Delay Light-Curve Anomalies of Gravitational Lenses
Stuart Wyithe, Abraham Loeb
Intensive monitoring campaigns have recently attempted to measure the time delays between multiple images of gravitational lenses. Some of the resulting light-curves show puzzling…
Cosmological Microlensing Statistics: Variability rates for Quasars and GRB Afterglows, and implications for macrolensing magnification bias and flux ratios
J. S. B. Wyithe, E. L. Turner
The fraction of quasar's and gamma-ray burst (GRB) afterglows that vary due to microlensing by the stellar populations of intervening elliptical/S0 galaxies is computed by combinin…