Check out his visualization in this article: http://news.columbia.edu/content/New-Study-Finds-Radiation-from-Nearby-Galaxies-Helped-Fuel-First-Monster-Black-Holes
Check out his visualization in this article: http://news.columbia.edu/content/New-Study-Finds-Radiation-from-Nearby-Galaxies-Helped-Fuel-First-Monster-Black-Holes