2011

The Imprint of the Baryon Acoustic Oscillations (BAO) in the Cross-correlation of the Redshifted HI 21-cm Signal and the Ly-alpha Forest

Sarkar, Tapomoy Guha, Bharadwaj, Somnath

Understand

The cross-correlation of the Ly-alpha forest and redshifted 21-cm emission has recently been proposed as an observational tool for mapping out the large-scale structures in the post-reionization era z < 6.

This has a significant advantage as the problems of continuum subtraction and foreground removal are expected to be considerably less severe in comparison to the respective auto-correlation signals.
Further, the effect of discrete quasar sampling is less severe for the cross-correlation in comparison to the Ly-alpha forest auto-correlation signal.
In this paper we explore the possibility of using the cross-correlation signal to detect the baryon acoustic oscillation (BAO).

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