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Early reionization by miniquasars
Piero Madau, Martin J. Rees, Marta Volonteri +2
Motivated by the recent detection by WMAP of a large optical depth to Thomson scattering -- implying a very early reionization epoch -- we assess a scenario where the universe was…
Fossil HII Regions: Self-Limiting Star Formation at High Redshift
S. Peng Oh, Zoltan Haiman
Recent results by the WMAP satellite suggest that the intergalactic medium was significantly reionized at redshifts as high as z~17. At this early epoch, the first ionizing sources…
Sunyaev-Zeldovich Fluctuations from the First Stars?
S. Peng Oh, Asantha Cooray, Marc Kamionkowski
WMAP's detection of high electron-scattering optical depth suggests substantial star formation at high redshift z~17 +/- 5. On the other hand, the recovered sigma_8 ~ 0.84 +/-0.04…
Foregrounds for 21cm Observations of Neutral Gas at High Redshift
S. Peng Oh, Katherine J. Mack
We investigate a number of potential foregrounds for an ambitious goal of future radio telescopes such as the Square Kilometer Array (SKA) and Low Frequency Array (LOFAR): spatial…