HI Fluctuations at Large Redshifts: II - the Signal Expected for GMRT

Details HI Fluctuations at Large Redshifts: II - the Signal Expected for GMRT HI Fluctuations at Large Redshifts: II - the Signal Expected for GMRT

2003-07-16

arxiv.org/abs/astro-ph/0307303v1

J.Astrophys.Astron.24:23-35,2003

Astronomy and Astrophysics

Astrophysics

16 pages including 7 figures, published in JApA

Scientific paper

10.1007/BF03012189

For the GMRT, we calculate the expected signal from redshifted HI emission at two frequency bands centered at 610 and 325 MHz. The study focuses on the visibility-visibility cross-correlations, proposed earlier as the optimal statistical estimator for detecting and analyzing this signal. These correlations directly probe the power spectrum of density fluctuations at the redshift where the radiation originated, and thereby provide a method for studying the large scale structures at large redshifts. We present detailed estimates of the correlations expected between the visibilities measured at different baselines and frequencies. Analytic fitting formulas representing the salient features of the expected signal are also provided. These will be useful in planning observations and deciding an optimal strategy for detecting this signal.

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