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21 cm cosmology and dark energy

Abstract : 3D mapping of matter distribution in the universe through the 21 cm radio emission of atomic hydrogen is a complementar y approach to optical sur veys for the study of the Large Scale Structures, in par ticular for measuring the BAO (Bar yon Acous- tic Oscillation) scale up to redshifts z=3 and constrain dark energy. We propose an instrument to carr y such a sur vey through intensity mapping, without detecting individual galax- ies. An R&D effor t (electronics, antenna/feeds, software, . . . ), initiated in 2007, is being carried by an international team (France, USA, Canada, China), to design a multi-beam (100-1000 beams), large field of view (10-100 sq. deg) and large bandwidth (100 MHz) instrument suited for 21 cm intensity mapping at z = 1 (http://bao.lal.in2p3.fr/21cm/).
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http://hal.in2p3.fr/in2p3-00652937
Contributor : Sabine Starita <>
Submitted on : Friday, December 16, 2011 - 3:48:03 PM
Last modification on : Wednesday, September 16, 2020 - 4:22:21 PM

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  • HAL Id : in2p3-00652937, version 1

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IN2P3 | LAL | CNRS

Citation

R. Ansari. 21 cm cosmology and dark energy. 12th International Conference on Topics in Astroparticle and Underground Physics (TAUP2011), Sep 2011, Munich, Germany. ⟨in2p3-00652937⟩

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