BAORadio: A digital pipeline for radio interferometry and 21 cm mapping of large scale structures
| Autor: | J. E. Campagne, M. Moniez, Christophe Yeche, R. Ansari, J. Rich, Christophe Magneville, Pierre Colom, Jean Michel Martin |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Mass distribution Phased array business.industry Astrophysics::Instrumentation and Methods for Astrophysics General Engineering FOS: Physical sciences Energy Engineering and Power Technology Field of view Reflector (antenna) Astrophysics::Cosmology and Extragalactic Astrophysics Digital radio 01 natural sciences Interferometry Cardinal point Optics 0103 physical sciences Angular resolution Astrophysics - Instrumentation and Methods for Astrophysics 010306 general physics business Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Comptes Rendus Physique. 13:46-53 |
| ISSN: | 1631-0705 |
| DOI: | 10.1016/j.crhy.2011.11.003 |
| Popis: | 3D mapping of matter distribution in the universe through the 21 cm radio emission of atomic hydrogen HI is a complementary approach to optical surveys for the study of the Large Scale Structures, in particular for measuring the BAO (Baryon Acoustic Oscillation) scale up to redshifts z < 3, and therefore constraining dark energy parameters. We propose a novel method to map the HI mass distribution in three dimensions in radio, without detecting or identifying individual compact sources. This method would require an instrument with a large instantaneous bandwidth (> 100 MHz) and high sensitivity, while a rather modest angular resolution (~ 10 arcmin) should be sufficient. These requirements can be met by a dense interferometric array or a phased array (FPA) in the focal plane of a large primary reflector, representing a total collecting area of a few thousand square meters with few hundred simultaneous beams covering a 20 to 100 square degrees field of view. We describe the development and qualification of an electronic and data processing system for digital radio interferometry and beam forming suitable for such instruments with several hundred receiver elements. 11 pages, 5 figures |
| Databáze: | OpenAIRE |
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