Home Radio waves Bengaluru researchers refute claims of radio signals from universe’s first stars

Bengaluru researchers refute claims of radio signals from universe’s first stars


Researchers from the Raman Research Institute (RRI) in Bengaluru claim to have refuted the discovery of the birth of the first stars by researchers from Arizona State University and MIT, according to a TOI report.


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The discovery of the birth of the first stars – the 21cm radio wave signal of Cosmic Dawn – a few hundred million years after the big bang had created a stir in the worldwide astronomical fraternity.

The team then used data from the EDGES radio telescope at the Murchison Radio Astronomy Observatory in Western Australia, developed in collaboration with ASU and the Haystack Observatory with infrastructure developed by CSIRO.

The recent discovery by RRI researchers adds more evidence to the presence of the existing cosmological model of the universe.

The discovery by the Arizona State University/MIT team has been considered one of the world’s most groundbreaking discoveries, and some have even called it Nobel Prize-worthy. The team then requested confirmation from the independent observatories.

RRI’s SAAS 3 radio telescope is the first such device in the world to achieve the level of sensitivity to conclusively disprove findings.

This came after extensive statistical analysis using SARAS 3 failed to find the signal claimed by EDGES.

The researchers explained: “The presence of the signal is definitely rejected after careful evaluation of the measurement uncertainties. The finding implies that the detection reported by EDGES was likely contamination from their measurement and not a signal from Cosmic Dawn.

They added: “Having rejected the ASU/MIT claim, the SARAS experiment aims to uncover the true nature of Cosmic Dawn and the RRI team is planning further observations at remote lakes in India which it says , will allow them to detect the 21 cm signal from Cosmic Dawn and unravel this last remaining void in the history of our Universe.

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The telescope is able to detect even the faintest cosmological signals – in particular the radiation emitted by hydrogen atoms at a wavelength of 21 cm from the depths of the cosmos.

To further improve its accuracy, it was floated on a raft on Dandiganahalli Lake and the backwaters of Sharavathi in North Karnataka for data collection, as it helps improve sensitivity by reducing confusing radio waves emitted by telescopes under the ground.

The researchers concluded that the results implied that the ASU/MIT researchers’ detection was more likely a contamination of their measurement and not a signal from the depths of space and time as assumed.