Radio Astronomical Probes of Cosmic Reionization

Details Radio Astronomical Probes of Cosmic Reionization Radio Astronomical Probes of Cosmic Reionization

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cfa..colle..22c&link_type=abstract

CfA Colloquium Lecture Series Talk

Astronomy and Astrophysics

Astronomy

Scientific paper

The epoch of reionization (EoR) corresponds to a 'cosmic phase transition', when the neutral intergalactic medium (IGM) becomes ionized by the first stars and/or AGN. While the discoveries of Gunn-Peterson (GP) absorption troughs in the spectra of the highest redshift QSOs, and large scale polarization of the CMB, have set the first constraints on the EoR, the process of reionization, and the nature of the first luminous objects, remain two of the paramount questions in cosmic structure formation. Moreover, the GP effect is such that observations of this epoch will be difficult at wavelengths shorter than about 1 micron. In this talk I will explore studies of the EoR at meter through millimeter wavelengths. I will present recent observations of the dust, molecular gas, and star formation activity in the host galaxies of the highest redshift QSOs (z > 6). These results have interesting implications on the timescale for metal and dust enrichment, on the possibility of co-eval formation of SMBHs and galaxies, and on the process of reionization. I will then discuss future capabilities of low frequency radio astronomy to study the neutral IGM via the HI 21cm line, including imaging and power spectral analyses of large scale structure in emission, and absorption studies toward the first radio loud sources.

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