CONCERTO aims to answer two fundamental questions:
1. What is the contribution of dusty star-formation to early galaxy evolution?
2. Are dusty galaxies play an important role in shaping cosmic reionization?
To reach that goal, we are constructing a spectrometer to map in three dimensions the specific intensity due to line emission, a technique known as "Intensity Mapping".
Capitalizing on a recent technology breakthrough on the development of large KIDS arrays, our intensity mapping experiment will measure the 3-D fluctuations of the [CII] line emission at redshift 4.5 < z < 8.5 The atomic [CII] line is one of the most valuable tracers of star formation at high redshift and is redshifted into the sub-millimeter and millimeter atmospheric windows.
We will use the [CII] line emission as a tracer of cosmic density structure, and give the first constraints on the power spectrum of dusty star-forming matter.
Our experiment will also observe the CO intensity fluctuations arising from 0.3 < z < 2 galaxies, giving the spatial distribution and abundance of molecular gas over a broad range of cosmic time.