Forecasted power spectrum measurements from the complete BINGO survey (1 year on-sky total integration). If systematics are controlled, including foreground removal and calibration, then BINGO will provide very accurate measurements of the HI power spectrum across a range of scales and redshifts. It also has the sensitivity to detect the BAO wiggles at z=0.1-0.5 (shown in the inset panel), and therefore constrain models of dark energy.
The Baryon acoustic oscillations in Integrated Neutral Gas Observations (BINGO) experiment is a project to build a special purpose radio telescope to map redshifted neutral hydrogen emission between z = 0.13 and 0.48. It is an international project with collaborators in Brazil, Saudi Arabia, Switzerland, United Kingdom and Uruguay. It is the only radio telescope that aims at mapping neutral gas, as traced by the 21cm line, on large angular scales and at redshift z~0.3. We call this method HI intensity mapping.
Using the Baryon Acoustic Oscillations (BAOs) as a standard ruler allows us to measure the expansion of the universe as a function of redshift and so, to constrain the properties of dark energy. The telescope will have no moving parts and consist of a primary mirror of about 40 m diameter and a secondary a bit smaller. It will have around 50 "pixels" (detectors). With this design, the accuracy on the measurement on the acoustic scale will be ~2% for one year of integration time, by performing a drift scan survey of 15 deg x 200 deg. This will be achieved by employing a static 40m dual-dish radio telescope with a resolution of 40 arcmin at 1 GHz.
The plan is to build the telescope in a disused open-caste gold mine in northern Uruguay where radio interference is minimal. The original BINGO concept is discussed in the paper by Battye et al., 2013 MNRAS, 434, 1239 (Cornell University Library). You can also view pages with more recent information on the BINGO telescope and simulating single-dish intensity mapping experiments on the same site. BINGO is also a pathfinder for using the SKA as an instrument for ultra-deep large-scale IM surveys, particularly for understanding systematic errors and the data analysis challenges for extracting such small cosmological signals.