Quasar
An artist's impression shows a primordial quasar as it might have been, surrounded by sheets of gas, dust, stars and early star clusters. NASA/ESA/ESO/Wolfram Freudling

Researchers of eBOSS, the international group which runs the biggest ongoing spectroscopy survey in the world have conducted a probe of the cosmic structure for the first time studying quasars, the high luminous active galactic nucleus located about 6.8 to 10.5 billion light-years from Earth to unravel the effect of gravitational force on cosmological bodies.

The National Astronomical Observations (NAOC) of the Chinese Academy of Sciences has officially announced the discovery of the signals on January 15. The survey measured Redshift Space Distortions (RSD), the pattern of the three-dimensional cosmic tracers that are affected by local gravitational potential.

The research has identified the effect of gravitational force on cosmological levels by studying the direct interaction of gravitation in its nearby local Universe. In the study, considered one of the most extensive in the field of cosmic gravitation conducted so far, scientists found the first signals from Redshift Space Distortions (RSD) from a cluster of galaxies in our local universe in 2001. The signals were found to be formed during the time when the universe was just one-third of its size today.

Scientists believe that the discovery could help in future research in advanced cosmological subjects like dark energy and gravitation.

The research team has earlier discovered Baryonic Acoustic Oscillation (BAO) measurements, which included the regular, periodic fluctuations in the density of the visible normal matter of the universe, using the quasars in May 2017.

Researchers have also confirmed the feasibility of cosmology studies using quasars and are planning to extend their research to emission line and luminous red galaxies in 2019. The eBOSS project was launched in 2014 with partnerships from multiple countries.