Near term measurements with 21 cm intensity mapping: neutral hydrogen fraction and BAO at z<2

Details Near term measurements with 21 cm intensity mapping: neutral hydrogen fraction and BAO at z<2 Near term measurements with 21 cm intensity mapping: neutral hydrogen fraction and BAO at z<2

2010-01-26

arxiv.org/abs/1001.4811v2

Phys.Rev.D81:103527,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 5 figures. Submitted to Phys. Rev. D. Addressed reviewer comments. Changed figure format, added more detailed technic

Scientific paper

10.1103/PhysRevD.81.103527

It is shown that 21 cm intensity mapping could be used in the near term to make cosmologically useful measurements. Large scale structure could be detected using existing radio telescopes, or using prototypes for dedicated redshift survey telescopes. This would provide a measure of the mean neutral hydrogen density, using redshift space distortions to break the degeneracy with the linear bias. We find that with only 200 hours of observing time on the Green Bank Telescope, the neutral hydrogen density could be measured to 25% precision at redshift 0.54

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