You’ve heard an actual galaxy cluster, but astronomers have managed to capture an actual radio signal from a galaxy located nearly 9 billion light-years from Earth. That’s right, teams from Montreal and India captured this radio signal from the most distant galaxy so far at a specific wavelength known as the 21 cm line, providing insight to the secrets of the early universe.
Thanks to the help of India’s Giant Metrewave Radio Telescope, this marks the first time this type of radio signal has been detected at such a large distance. This signal was emitted from the galaxy, classified as SDSSJ0826+5630, when the universe was a mere 4.9 billion years old, or the equivalent of looking back in time approximately 8.8 billion years.
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Gravitational lensing magnifies the signal coming from a distant object to help us peer into the early universe. In this specific case, the signal is bent by the presence of another massive body, another galaxy, between the target and the observer. This effectively results in the magnification of the signal by a factor of 30, allowing the telescope to pick it up,” said Nirupam Roy, co-author and an Associate Professor in the Department of Physics at the Indian Institute of Science.
