Oxygen Pumping: Mapping the Reionization Epoch with the CMB

Details Oxygen Pumping: Mapping the Reionization Epoch with the CMB Oxygen Pumping: Mapping the Reionization Epoch with the CMB

2006-12-14

arxiv.org/abs/astro-ph/0612363v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, submitted to ApJ

Scientific paper

We consider the pumping of the $63.2 \mu$m fine structure line of neutral OI in the high--redshift intergalactic medium (IGM), in analogy with the Wouthuysen--Field effect for the 21cm line of cosmic HI. We show that the soft UV background at $\sim 1300$\AA can affect the population levels, and if a significant fraction of the IGM volume is filled with ``fossil HII regions'' containing neutral OI, then this can produce a non--negligible spectral distortion in the cosmic microwave background (CMB). OI from redshift $z$ is seen in emission at $(1+z)63.2\mu$m, and between $7

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