Building Ancient Cosmic CitiesGalaxy Protoclusters are large overdense structures in the early Universe from which galaxy clusters gravitationally collapse. They represent an unique interface between the subjects of galaxy formation and cosmology, and a key laboratory to study both in their extreme conditions. A major part of my work has been pioneering the numerical modeling, observations, and physical inferences of protoclusters and their relations to both large and small scale astrophysics.
Dissecting The 3D UniverseClustering Redshift Estimation is a powerful technique to perform tomographic analyses on many types of observables of the angular sky. Utilizing the fact that extragalactic objects are gravitationally clustered in the filamentary cosmic web, we can propagate information from a spatially 3D data set (the "reference" sample with RA, Dec, redshift available) to a 2D one (the "unknown"). This is achieved by a series of angular cross correlations. The applications include inferring the redshift distribution of photometrically selected galaxies, and deprojecting various cosmic intensity fields from 2D back to 3D.
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