The Dark Energy Spectroscopic Instrument First Year Results: Baryon Acoustic Oscillations from Galaxies and Quasars at z <2*

The Dark Energy Spectroscopic Instrument (DESI) collaboration is conducting a five-year redshift survey of 40 million extra-galactic sources over 14,000 square degrees of the northern sky up to the redshift of 4 with the Mayall 4-meter telescope at Kitt Peak National Laboratory. One of its primary goals is to measure the cosmic expansion history precisely and accurately through the measurements of baryon acoustic oscillations (BAO). In this talk, I will present the unblinded measurements of DESI First Year  Baryon Acoustic Oscillations using the distributions of galaxies and quasars over the redshift range of 0.1-2 and the estimates of the relevant systematics. For the first time, we employed catalog-level blinding in the BAO analysis to prevent confirmation bias in determining the expansion history. The resultant aggregate precision of DESI Year 1 BAO surpasses that of all previous galaxy surveys combined prior to DESI.