Astronomers fromIndian Institute of Science(IISc) in Bengaluru andMcGill Universityin Canada have used data from the Giant Metrewave Radio Telescope (GMRT) in Pune to detect a radio signal originating from atomic hydrogen in an extremely distant galaxy.
The signal was emitted when the universe was only 4.9 billion years old.
It means the look-back time for this source is 8.8 billion years. The findings have been published in the monthly notices of the Royal Astronomical Society.
The astronomical distance over which such a signal has been picked up is the largest so far by a large margin. This is also the first confirmed detection of strong lensing of 21cm emission from a galaxy.