Canadian and IISc astronomers detect radio signal in distant galaxy using Giant Metrewave Radio Telescope
Astronomers from McGill University in Canada and the Indian Institute of Science in Bengaluru have used data from the Giant Metrewave Radio Telescope in Pune to detect a radio signal originating from atomic hydrogen in an extremely distant galaxy. Distant galaxy Using GMRT data, Arnab Chakraborty, postdoctoral researcher at the Department of Physics and Trottier Space Institute of McGill University, and Nirupam Roy, Associate Professor, Department of Physics, IISc have detected a radio signal from atomic hydrogen in a distant galaxy at redshift z=1.29. “Due to the immense distance to the galaxy, the 21 cm emission line had redshifted to 48 cm by the time the signal travelled from the source to the telescope,” said Chakraborty. Gravitational lensing “This detection was made possible by a phenomenon called gravitational lensing, in which the light emitted by the source is bent due to the presence of another massive body, such as an early type elliptical galaxy, between the target galaxy and the observer, effectively resulting in the magnification of the signal.
India's Giant Metrewave Radio Telescope is on track to get a major upgrade by 2018
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