BAORadio : Cartographie 3D de la distribution de gaz H$_I$ dans l'Univers

Details BAORadio : Cartographie 3D de la distribution de gaz H$_I$ dans l'Univers BAORadio : Cartographie 3D de la distribution de gaz H$_I$ dans l'Univers

2011-06-28

arxiv.org/abs/1106.5659v1

Conference proceedings - Contribution aux Journ\'ees Scientifiques "Les radiot\'elescopes du Futur. Technologies et avanc\'ees

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

Scientific paper

3D mapping of matter distribution in the universe through the 21 cm radio emission of atomic hydrogen 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 constrain dark energy. We propose to carry such a survey through a novel method, called intensity mapping, without detecting individual galaxies radio emission. This method requires a wide band instrument, 100 MHz or larger, and multiple beams, while a rather modest angular resolution of 10 arcmin would be sufficient. The instrument would have a few thousand square meters of collecting area and few hundreds of simultaneous beams. These constraints could be fulfilled with a dense array of receivers in interferometric mode, or a phased array at the focal plane of a large antenna.

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