• Apr 30 2015

    Dr Tabitha Voytek (Carnegie Mellon University)


    Dear All,

    Please see below and attached invitation to a seminar:


    Dr Tabitha Voytek, Carnegie Mellon University


    Title: Studying the History of the Intergalactic Medium with the SCI-HI Experiment

    Abstract:
    The Cosmic Dawn (z~15-35) is the period in the history of our universe when stars first began to form in small Dark Matter minihalos. Light from these first stars is too dim for telescopes to see, which means that the Cosmic Dawn has never been directly measured. However, the first stars impacted the gas, or intergalactic medium (IGM), around them. The impact of the first stars was heating and eventual ionization of the IGM. The process of heating and ionization creates a spectrum that varies over redshift, namely the spatially averaged brightness temperature spectrum of 21-cm light from the IGM. Measurement of this spectrum will give us a first glimpse of the Cosmic Dawn.

    The ''Sonda Cosmologica de las Islas para la Deteccion de Hidrogeno Neutro'' (SCI-HI) experiment is a collaboration between Carnegie Mellon University (CMU) and Instituto Nacional de Astrofisica, Optica y Electronica (INAOE) in Mexico and was designed to make this measurement. The SCI-HI experiment is a small-scale system which travels with the team to remote locations for deployments. These remote locations are necessary to avoid radio frequency interference and other environmental impacts on the system.

    This talk will discuss the SCI-HI instrument and data analysis, as well as show results from the original deployment on Isla Guadalupe in Mexico in June 2013. The talk will also discuss recent progress with the SCI-HI experiment here in South Africa. This includes the addition of UKZN to the collaboration, our recent deployment to the SKA Karoo site, and plans for deployment to Marion Island in 2016.


    Kind regards
    Neli