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3 ago 2023 · By analysing JWST images, Lukas Furtak at Ben-Gurion University of the Negev in Be’er-Sheva, Israel, and his colleagues spotted what could be an early quasar — observed when the Universe was ...
A quasar ( / ˈkweɪzɑːr / KWAY-zar) is an extremely luminous active galactic nucleus (AGN). It is sometimes known as a quasi-stellar object, abbreviated QSO. The emission from an AGN is powered by a supermassive black hole with a mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.
20 ott 2022 · The quasar is an “extremely red” quasar that exists in the very early Universe, 11.5 billion years ago. The image in the centre is composed of four narrow-band images made from the Webb NIRSpec instrument’s integral-field spectroscopy mode. All the four narrow-band images show extremely red-shifted emissions from doubly ionised oxygen ...
18 dic 2003 · A gravitationally lensed quasar with quadruple images separated by 14.62 arcseconds. Nature 426 , 810–812 ( 2003) Cite this article. Gravitational lensing is a powerful tool for the study of the ...
19 feb 2024 · Using the European Southern Observatory’s (ESO) Very Large Telescope (VLT), astronomers have characterised a bright quasar, finding it to be not only the brightest of its kind, but also the most luminous object ever observed. Quasars are the bright cores of distant galaxies and they are powered by supermassive black holes. The black hole in this record-breaking quasar is growing in mass by ...
The gravity of the massive foreground galaxy is acting like a magnifying glass by warping the quasar’s light in an effect called gravitational lensing. Quasars are extremely distant cosmic streetlights produced by active black holes. Such quadruple images of quasars are rare because of the nearly exact alignment needed between the foreground ...
5 apr 2023 · Because Hubble peers into the distant past, this double quasar no longer exists. Over the intervening 10 billion years, their host galaxies have likely settled into a giant elliptical galaxy, like the ones seen in the local universe today. And, the quasars have merged to become a gargantuan, supermassive black hole at its center.
