Astronomers publish map showing 25,000 supermassive black holes – Phys.org

An international team of astronomers has published a map of the sky showing over 25,000 supermassive black holes. The map, to be published in the journal Astronomy & Astrophysics, is the most detailed celestial map in the field of so-called low radio frequencies. The astronomers, including Leiden astronomers, used 52 stations with LOFAR antennas spread across nine European countries.
Stars or black holes?
To an untrained eye, the sky map appears to contain thousands of stars, but they are actually…

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