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With high-resolution imaging from ground-based telescopes and the Hubble Space Telescope, the "host galaxies" surrounding the quasars have been detected in some cases. [39] These galaxies are normally too dim to be seen against the glare of the quasar, except with special techniques.
The object itself was detected in ESO images dating back to 1980, but its identification as a quasar occurred only several decades later. [2]An automated analysis of 2022 data from the European Space Agency's Gaia satellite did not confirm J0529-4351 as too bright to be a quasar, and suggested it was a 16th magnitude star with a 99.98% probability.
A third point-like lensed image of the quasar was detected in 2020, located part way between the other two. [13] PKS 1830-211 is a source for gamma-ray emission that undergoes significant flaring. [15] PKS 1830-211 has been used as a radio source for measuring redshifted molecular species, including ArH +, CF +, HCN, HCO +, H 2 O, NH 3, and OH +.
At a distance of more than 13.03 billion light years from Earth, J0313–1806 is the most distant— and thus the most ancient — quasar yet seen by astronomers. Astronomers just detected the ...
Any quasar with z > 1 is receding faster than c, while z exactly equal to 1 indicates recession at the speed of light. [33] Early attempts to explain superluminal quasars resulted in convoluted explanations with a limit of z = 2.326, or in the extreme z < 2.4. [34] The majority of quasars lie between z = 2 and z = 5.
NLS1's are believed to have abnormally small black holes; since black hole size is strongly correlated with galaxy size, the host galaxy of the quasar should also be abnormally small, explaining why it had not been detected by Magain et al. (2) The quasar spectrum also reveals the presence of a classic, narrow emission line region (NLR).
PKS 0458-020 is found variable across the electromagnetic spectrum and a source of gamma ray activity. [7] [8] [9] It is known to show optical flares which was detected by Fermi Gamma-ray Space Telescope (Fermi LAT) [10] and by the Nordic Optical Telescope in September 2012, where it was reported to be 30 times brighter than its daily flux of (E > 100 MeV) when recorded by Fermi LAT. [11]
Although, there is no soft excess and low energy absorption have been detected, the thermal bremsstrahlung model is found to fit with the spectrum of PKS 2126 - 158, with a rest-frame temperature of 6.4_-4_^+40^ keV. This makes it the most luminous quasar detected in (30 keV) hard X-rays. [13]