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Rest-UV Absorption Lines as Metallicity Estimator: the Metal Content of Star-Forming Galaxies at z~5
A. L. Faisst, P. L. Capak, I. Davidzon +12
We measure a relation between the depth of four prominent rest-UV absorption complexes and metallicity for local galaxies and verify it up to z~3. We then apply this relation to a…
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…
The Quasar-LBG Two-point Angular Cross-correlation Function at z ~ 4 in the COSMOS Field
H. Ikeda, T. Nagao, Y. Taniguchi +15
In order to investigate the origin of quasars, we estimate the bias factor for low-luminosity quasars at high redshift for the first time. In this study, we use the two-point angul…
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…
Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
D. Spergel, N. Gehrels, C. Baltay +52
This report describes the 2014 study by the Science Definition Team (SDT) of the Wide-Field Infrared Survey Telescope (WFIRST) mission. It is a space observatory that will address…