Papers › Improved Redshifts for DESI EDR Quasars
Improved Redshifts for DESI EDR Quasars
Qiaoya Wu, Yue Shen
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The Dark Energy Spectroscopic Instrument (DESI) survey will provide optical spectra for ∼3 million quasars. Accurate redshifts for these quasars will facilitate a broad range of science applications. Here we provide improved systemic redshift estimates for the ∼95k quasars included in the DESI Early Data Release (EDR), based on emission-line fits to the quasar spectra. The majority of the DESI pipeline redshifts are reliable. However, ∼19% of the EDR quasars have pipeline redshifts that deviate from our new redshifts by >500 km s⁻¹. We use composite quasar spectra to demonstrate the improvement of our redshift estimates, particularly at z>1. These new redshifts are available at \url{https://github.com/QiaoyaWu/DESI_EDR_qsofit/blob/main/DESI_EDR_Aug29_redshift_only.fits}.
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