Low-redshift Interlopers in the SDSS DR16 z > 5 Quasar Catalog
High-redshift quasars (z > 5) are crucial for studying early black hole growth and reionization. Sloan Digital Sky Survey (SDSS) Data Release 16 catalogs 655 such sources with multiple redshift estimators. We systematically examined this subsample and found 480 sources (73.2%) where pipeline redshift (Z_DR16Q) disagr...