Speaker #1 — JYi-Kuan Chiang
Title: Intensity Mapping Tomography: Cosmic UV Background and Beyond
Abstract: Intensity mapping is an emerging way to probe the matter and radiation content in the universe, and the target features do not need to be limited to strong emission lines. I will introduce a highly generic, cross-correlation-based framework to recover previously collapsed redshift information for cosmic photons in intensity maps of arbitrary bandwidths. This enables a tomography of the radiation budget not only across cosmic time but also in frequency space as the photons get redshifted by the cosmic expansion. I will demonstrate this method with data by probing the continuum, Lyα line, and Lyman break in the cosmic UV background up to z~2 using GALEX All Sky and Medium Imaging Surveys. This allows us to perform spectral diagnostics for the entire body of the UV background and provide insights on cosmic star formation, black hole accretion, and potential emission from the diffuse intergalactic medium. We expect this method to be generically applicable for a rich set of existing and upcoming wide-field datasets in probing the cosmic background over a wide range of wavebands and cosmic history.
Speaker #2 — Nick Kern
Title: Data Analysis and Parameter Inference for 21cm Cosmology and the Effort to Detect the Epoch of Reionization with HERA