Tom Mozdzen is a PhD candidate at Arizona State University studying the Epoch of Recombination (EoR) by measuring the redshifted global 21 cm interaction with the CMB. The frequencies of interest lie between 50 MHz and 200 MHz, which corresponds to a redshifted signal between z ~ 30 and z ~ 6. A simple dipole antenna with a wide beam is recording the spectra of the sky in Western Australia where the Radio Frequency Interference (RFI) is low. The foreground radiation of our Galaxy must be subtracted carefully from the antenna measurements so as not to lose the very small signal of the EoR. This is not an easy task as the EoR signal is ~100,000 times smaller than the foreground noise of the sky. There are many efforts underway to constrain the time and duration of reioinization. Although there has been progress in this area, more exact measurements are needed to reveal the shape of the signal, which will give us insight into the timing of the formation of the first stars, galaxies, and black holes.
email: tmozdzen at asu.edu