The Sloan Digital Sky Survey (SDSS) has released Data Release 20 (DR20), marking a major advancement in the study of supermassive black holes through the Black Hole Mapper (BHM) program. This dataset includes over 3.3 million optical spectra collected from both the Southern Hemisphere (Las Campanas Observatory) and the Northern Hemisphere (Apache Point Observatory), covering 500,000 galaxies and 1.5 million stars. A key component of DR20 is the SPIDERS project, which combines SDSS optical data with X-ray maps from the eROSITA mission to identify and measure distances to around 200,000 X-ray sources. These sources include numerous active galactic nuclei (AGN) and quasars powered by accreting supermassive black holes. The data reveal that massive black holes were more prevalent in the early universe than previously thought, including many 'hidden' black holes missed by traditional optical surveys.
Bias read (Center): The article discusses scientific research related to astronomy and astrophysics, focusing on data collection and analysis techniques for studying supermassive black holes. There is no mention of political figures, policies, or contentious issues, making the content apolitical.
