Canadian and IISc astronomers detect radio sign in distant galaxy utilizing Large Metrewave Radio Telescope 

Photos of detection of radio sign originating from atomic hydrogen in a particularly distant galaxy.
| Photograph Credit score: Particular Association

Astronomers from McGill College in Canada and the Indian Institute of Science (IISc) in Bengaluru have used information from the Large Metrewave Radio Telescope (GMRT) in Pune to detect a radio sign originating from atomic hydrogen in a particularly distant galaxy.

“The astronomical distance over which such a signal has been picked up is the largest so far. This is also the first confirmed detection of strong lensing of 21 cm emission from a galaxy, “IISc said. The findings have been published in the Monthly Notices of the Royal Astronomical Society.

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,” stated Chakraborty.

The sign detected by the staff was emitted from this galaxy when the universe was solely 4.9 billion years previous; in different phrases, the look-back time for this supply is 8.8 billion years.

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. In this specific case, the magnification of the signal was about a factor of 30, allowing us to see through the high redshift universe,” stated Prof Roy.

The staff additionally noticed that the atomic hydrogen mass of this specific galaxy is nearly twice as excessive as its stellar mass. These outcomes display the feasibility of observing atomic fuel from galaxies at cosmological distances in related lensed programs with a modest quantity of observing time. It additionally opens up thrilling new prospects for probing the cosmic evolution of impartial fuel with current and upcoming low-frequency radio telescopes within the close to future.

Difficult process

Yashwant Gupta, Middle Director at NCRA, stated, “Detecting neutral hydrogen in emission from the distant Universe is extremely challenging and has been one of the key science goals of GMRT. We are happy with this new path breaking result with the GMRT, and hope that the same can be confirmed and improved upon in the future.”

The Large Metrewave Radio Telescope was constructed and is operated by NCRA-TIFR. The analysis was funded by McGill and IISc.

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