BCCP talks

Monday, October 20
RAL seminar

Location: UCB,  Hearst Field Annex B1, 3:10 p.m.
Speaker: Tabitha Voytek (Carnegie Mellon University)
Title: Hydrogen and the First Stars: First Results from the SCI-HI 21-cm all-sky spectrum experiment
Abstract: I will be introducing the 
Sonda Cosmologica de las Islas para la Deteccion de Hidrogeno Neutro” (SCI-HI) experiment. This experiment is an all-sky 21-cm brightness temperature spectrum experiment studying the cosmic dawn (z~15-35) through the temporal evolution of the IGM. The experiment is a collaboration between Carnegie Mellon University (CMU) and Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE) in Mexico. Initial deployment of the SCI-HI experiment occurred in June 2013 on Guadalupe; a small island about 250 km off of the Pacific coast of Baja California in Mexico. I will discuss the preliminary measurements from this deployment, placing first constraints on the 21-cm all-sky spectrum around 70 MHz (z~20), see Voytek et al (2014). I will also discuss the current work to improve the experiment; including both instrumental improvements and deployment locations.

 Tuesday October 21
Berkeley Cosmology Seminars
Location: UCB – Hearst Field Annex B1, 1:10 p.m. (also videoconferenced to LBNL 50-5026)
Speaker: Josh Dillon, MIT
Title: “Chasing the Cosmic Dawn with 21 cm Tomography”
Abstract: Realizing the promise of 21 cm cosmology to provide an exquisite probe of astrophysics and cosmology during the cosmic dark ages and the epoch of reionization has proven extremely challenging. We’re looking for a small signal buried under foregrounds orders of magnitude stronger. We know that we’re going to need very sensitive, and thus very large, low frequency interferometers, which present their own set of difficulties. And, as I will explain, we’re going to need a rigorous statistical analysis of the maps we make to extract interesting cosmological information. I will discuss the steps we’ve taken to overcome these obstacles with prototype data from the Murchison Widefield Array by isolating foregrounds to a region of Fourier space outside a clean “epoch of reionization window.” Additionally, I will present some of most recent and exciting predictions for what 21 cm cosmology can tell us as we move to larger telescopes like the Hydrogen Epoch of Reionization Array and higher redshifts.


For future BCCP talks, see this page.