Spectroscopic imaging of extended baryon oscillations (eBOSS) is the world's largest study of galaxies. It is the fourth phase of the investigation of the Sloan digital sky survey.
EBOSS scientists have measured cosmic redshift distortions (RSD) using observations of quasars 6.8-10.5 billion light years away from our planet (with a red shift of 0.8-2.2).
RSD is a special sample of the three-dimensional distribution of space tracers based on the influence of the local gravitational potential. The first RSD signals from the galactic cluster in the local universe were observed in 2001.
BAO distance (red points on the left) and RSD measurements (red points on the right) from the eBOSS review. The filled line shows Planck’s satellite measurements (studying cosmic microwave background) For the first time, the RSD measurement from eBOSS used quasars in deep space. This helped extract data at a time when the universe reached less than half of today's age.
Calculating RSD is another significant achievement by eBOSS researchers. It can influence the study of dark energy and gravity. The team conducted the first measurement of baryon acoustic vibrations (BAO) using quasars in May 2017.
The progress achieved at this time confirmed the possibility of space research based on quasars. Therefore, in 2019, scientists plan to deal with emission lines and luminous red galaxies.
