First detections of stellar light from quasar host galaxies at z > 6

19. 07 2022

Black holes

Evidence for a moderate spin from X-ray reflection of the high-mass supermassive black hole in the cluster-hosted quasar H1821+643

17. 06 2022

Quasars

Discovery of the most luminous quasar of the last 9 Gyr

15. 09 2021

Quasars

Distant quasars could be used for measuring long distances in the universe

Astronomers use variable cepheid stars and specific supernovae to measure distances in the universe. However these tools come up short when trying to measure distances longer than 3 billions light years. New research suggests quasars (distant active galactic nucleai) could be used in similar way.

22. 08 2021

Black holes

Radio source J2102+6015 is an active galactic nucleus with 3 300 light years across