21 cm Intensity Mapping

Details 21 cm Intensity Mapping 21 cm Intensity Mapping

2009-02-18

arxiv.org/abs/0902.3091v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

White Paper for the Astro2010 Astronomy Decadal Review

Scientific paper

Using the 21 cm line, observed all-sky and across the redshift range from 0 to 5, the large scale structure of the Universe can be mapped in three dimensions. This can be accomplished by studying specific intensity with resolution ~ 10 Mpc, rather than via the usual galaxy redshift survey. The data set can be analyzed to determine Baryon Acoustic Oscillation wavelengths, in order to address the question: 'What is the nature of Dark Energy?' In addition, the study of Large Scale Structure across this range addresses the questions: 'How does Gravity effect very large objects?' and 'What is the composition our Universe?' The same data set can be used to search for and catalog time variable and transient radio sources.

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