Signatures of the Baryon Acoustic Oscillations on 21cm Emission Background

Details Signatures of the Baryon Acoustic Oscillations on 21cm Emission Background Signatures of the Baryon Acoustic Oscillations on 21cm Emission Background

2007-09-25

arxiv.org/abs/0709.3871v3

Astrophys.J. 673 (2008) L107

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, accepted for publication in ApJ Lett. References updated

Scientific paper

10.1086/527559

The baryon acoustic oscillations (BAO) prior to recombination should be imprinted onto the 21cm emission background from the epoch of reionization through the underlying density perturbations. Using an analytical approach for both matter power spectrum (CDM+baryons) and reionization process, we demonstrate the BAO induced signatures on the power spectrum of 21cm emission fluctuations. Future low-frequency radio telescopes such as LOFAR and MWA should be able to detect these weak BAO wiggles with an integration time of $\sim1$ year. A combination of the BAO measurements at different redshifts $z\approx1000$ (CMB), $z\approx10$ (epoch of reionization) and $z\approx0$ (clustering of galaxies) may allow one to set more robust constraints on the determinations of cosmological parameters including dark energy and its equation of state.

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