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Eddington ratio Distribution of X-ray selected broad-line AGNs at 1.0<z<2.2
Hyewon Suh, Guenther Hasinger, Charles Steinhardt +2
We investigate the Eddington ratio distribution of X-ray selected broad-line active galactic nuclei (AGN) in the redshift range 1.0<z<2.2, where the number density of AGNs peaks. C…
Mapping the Galaxy Color-Redshift Relation: Optimal Photometric Redshift Calibration Strategies for Cosmology Surveys
Daniel Masters, Peter Capak, Daniel Stern +17
Calibrating the photometric redshifts of >10^9 galaxies for upcoming weak lensing cosmology experiments is a major challenge for the astrophysics community. The path to obtaining t…
Exploring Photometric Redshifts as an Optimization Problem: An Ensemble MCMC and Simulated Annealing-Driven Template-Fitting Approach
Joshua S. Speagle, Peter L. Capak, Daniel J. Eisenstein +2
Using a grid of million elements () adapted from COSMOS photometric redshift (photo-z) searches, we investigate the general properties of template-based photo-…
The Impossibly Early Galaxy Problem
Charles L. Steinhardt, Peter Capak, Dan Masters +1
The current hierarchical merging paradigm and CDM predict that the universe should be a time in which the most massive galaxies are transitioning from their initial…