skip to primary navigationskip to content


The Radio Experiment for the Analysis of Cosmic Hydrogen (REACH) is a global 21-cm experiment dedicated to the study of the early epochs of the Universe (Cosmic Dawn and the Epoch of Re-ionization). REACH is a radiometer targeting the detection of the redshifted 21-cm Hydrogen line from the time when the first luminous objects in the Universe were formed. 
First stars

REACH is a joint experiment between the University of Cambridge and Stellenbosch University in South Africa. With primary funding from the KICC, REACH will be deployed in the semi-deserted land of the Karoo radio reserve in South Africa, a unique RFI (Radio Frequency Interference) quiet site also home of the future Square Kilometer Array telescope.

21cm Cosmology
The instrument will operate between 50 and 200 MHz in order to explore both the Cosmic Dawn and the Epoch of Re-ionization. REACH is a wideband radiometer using state of the art ultra smooth wideband radio antenna designs aiming at reducing the contamination of the cosmic signal. REACH is furthermore making use of advanced Bayesian data analysis tools as well as physics rooted models of the instrument, the 21-cm signal and the foreground signals under which the cosmic signal is buried. Precisely these foregrounds (~100,000 times brighter than the cosmic signal) are the main reason why this detection has not been made yet.
REACH system

KICC Annual Report 2018

Read more

RSS Feed Latest news

Detecting galaxy halo heating from accreting black holes

Oct 25, 2019

Scientists at the Kavli Institute have identified hot gas around the most luminous quasar at an epoch when the universe was less than 4 billion years old.

Stormy cluster weather could unleash black hole power and explain lack of cosmic cooling

Oct 17, 2019

“Weather” in clusters of galaxies may explain a longstanding puzzle, according to a team of researchers at the University of Cambridge.

A Reanalysis of Planck

Oct 14, 2019

Members of KICC since its foundation and longstanding members of the Planck collaboration, Prof. George Efstathiou and Dr. Steven Gratton recently uploaded their detailed reanalysis of the Planck satellite Cosmic Microwave Background data to the arXiv preprint server.

View all news