It seems like there might be some confusion regarding the discovery of Cygnus A, one of the first identified extragalactic radio sources. While R.C. Jennison and his colleagues at Jodrell Bank made significant contributions to radio astronomy, the discovery of Cygnus A as a strong radio source is usually credited to Grote Reber (1944) and Hey, Parsons & Phillips (1946).

Possible Contributions of Mrinal Kumar Dasgupta

If Mrinal Kumar Dasgupta was involved in further studies of Cygnus A in 1953, his work could have been in the detailed mapping of its double-lobed structure using interferometry techniques at Jodrell Bank.

First recognized as a powerful radio source in the 1940s.

In 1953, it was confirmed to be a double radio source, meaning it has two large radio lobes emitted from an active galactic nucleus (AGN)—one of the earliest examples of what we now call a radio galaxy.

Located 600 million light-years away, it remains one of the strongest radio sources in the sky. The radio jets are powered by a supermassive black hole at its core.