Constraints on Fundamental Cosmological Parameters with Upcoming Redshifted 21 cm Observations

Details Constraints on Fundamental Cosmological Parameters with Upcoming Redshifted 21 cm Observations Constraints on Fundamental Cosmological Parameters with Upcoming Redshifted 21 cm Observations

2005-12-12

arxiv.org/abs/astro-ph/0512262v2

Astrophys.J.661:1-9,2007

Astronomy and Astrophysics

Astrophysics

Replaced with version accepted by ApJ. 13 pages, including 4 figures and 5 tables

Scientific paper

10.1086/516560

Constraints on cosmological parameters from upcoming measurements with the Mileura Widefield Array-Low Frequency Demonstrator (MWA-LFD) of the redshifted 21 cm power spectrum are forecast assuming a flat LCDM cosmology and that the reionization of neutral hydrogen in the intergalactic medium occurs below a redshift of z=8. We find that observations with the MWA-LFD cannot constrain the underlying cosmology in this scenario. In principle, a similar experiment with a 10-fold increase in collecting area could provide useful constraints on the slope of the inflationary power spectrum, n_s, and the running of the spectral index, alpha_s, but these constraints are subject to the caveat that even a small reionization contribution could be confused with the cosmological signal. In addition to the redshifted 21 cm signal, we include two nuisance components in our analysis related to the systematics and astrophysical foregrounds present in low-frequency radio observations. These components are found to be well separated from the signal and contribute little uncertainty (<30%) to the measured values of the cosmological model parameters.

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