SDSS Data Release 20 unveils new views of supermassive black holes
sdss.org/black-hole-mapper-release-20/
SDSS-V Data Release 20 adds the first southern-hemisphere optical BOSS spectra, expands the Black Hole Mapper’s X-ray follow-up with eROSITA, and releases more than 3.3 million optical spectra for studying quasars and active galactic nuclei across cosmic time.
