Title: The Evolving X-ray Spectrum of Active Galactic Nuclei Abstract: The cosmic X-ray background (XRB) spectrum and active galaxy number counts encode essential information about the spectral evolution of active galactic nuclei (AGNs) and have been successfully modeled by XRB synthesis models for many years. Recent measurements of the 8–24 keV AGN number counts by … Continue reading "CRA Cosmic Coffee: Mathilda Avirett-Mackenzie"

https://research.monash.edu/en/persons/juan-calderon-bustillo Title: Exploring the strong field phenomena of black holes Abstract: At the event horizon of a black hole, gravity reaches its most extreme behaviour. Studying the dynamics of event horizons is key to understand gravity in is ultra-strong field regime and investigate the most fundamental properties of black holes. Black hole collisions provide a … Continue reading "CRA Seminar: Dr. Juan Calderon Bustillo (Monash University)"

  Title: Where Do Population III Stars Form? Abstract: We perform a cosmological simulation with a comoving volume of 1 Mpc^3 to study the birth-places of Population III stars, using the adaptive mesh refinement code Enzo. We investigate the distribution of host halo masses and its relationship to the Lyman-Werner background intensity. In our sample … Continue reading "CRA Cosmic Coffee: Danielle Skinner"

Title: Marginally Trapped Surfaces in Black Hole Mergers Abstract: For numerical simulations of black hole mergers, typically the apparent horizon that forms is of primary interest and can be used to calculate the mass and angular momentum of the merger remnant. In a generic binary black hole evolution however, the apparent horizon is only one … Continue reading "CRA Cosmic Coffee: Chris Evans"