Quasars are active galactic nuclei that are powered by supermassive black holes, which are millions to billions of times the mass of our Sun. The supermassive black hole consumes large quantities of ...

Chinese astronomers have investigated quasar candidates from the DESI Legacy Surveys (DESI-LS) photometry catalog. As a result, they detected 19 strongly-lensed, dual and projected quasars.

In this case, the quasar is being lensed by a closer unnamed galaxy, which is visible as a blue dot in the center of the ...

Abstract: Quasars in the Age of Time-Domain Astronomy: Black hole feeding, visible as quasars, is a critical ingredient in many fields from galaxy evolution to multi-messenger gravitational wave ...