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...n such supermassive black holes must exist in our local universe as "dead" quasars. ...asars existed in the [[observable universe]]. This number density of "dead quasars" was attributed by Lynden-Bell to high [[mass-to-light ratio]] objects foun ...

...sity of the source.<ref name = Baldwin1977/> For flat-spectrum, radio-loud quasars the relation ...sence of massive [[accretion disk]]s in the centres of active galaxies and quasars.<ref name = Netzer1985/> However, a complete explanation is still outstandi ...

{{short description|An explanation for how quasars are powered}} * [[Astrophysical jet|Astrophysical jets]], large structures seen around some quasars and created by the Blandford–Znajek process and/or the Penrose process ...

...ref name="Becker1997" /><ref name="Brotherton1998" /> Other, high-redshift quasars were identified in the survey by cross-matching with SDSS.<ref name="McGree ...s during the course of the survey, including stars, [[pulsar]]s, galaxies, quasars, and unidentified radio sources.<ref name="Thyagarajan2011" /> On large sc ...

{{Short description|One of the most distant quasars known}} ...]]|date=30 June 2011}}</ref> Such statements are erroneous, however; other quasars are known to be at least 100 times more luminous.<ref name=Hopkins>{{Cite j ...

...G candidates concentrate around the hot DOGs, which may suggest that these quasars are either an early stage [[Galaxy cluster|proto-cluster]] or that they can ...ng X-ray light on the formation sites of high-z Hot Dust Obscured luminous quasars |last2=Piconcelli |first2=Enrico |date=2024-07-01|bibcode=2024eas..conf.165 ...

| title = Faint progenitors of luminous <math>z\sim 6</math> quasars: Why do not we see them? ...

...escope|HST]]/[[Cosmic Origins Spectrograph|COS]] dataset of low-redshift [[quasars]] gives a median <math>b</math> parameter of around <math>33\ \mathrm{km\ s ...

[[Category:Quasars]] ...

...vey. I. Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6|url=http://adsabs.harvard.edu/abs/2001AJ....122.2833F|journal=The As ...t quasars in universe formed |url=https://phys.org/news/2022-07-scientists-quasars-universe.html |website=phys.org |publisher=Provided by University of Portsm ...

[[Category:Quasars]] ...

...es whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.<ref name="SIMBAD-NGC681"> {{cite si ...

...ation. 2024. DESI 2024 III: Baryon Acoustic Oscillations from Galaxies and Quasars]</ref> <ref>[https://arxiv.org/abs/2404.03001 DESI Collaboration. 2024. DES ...

...vations{{Verify source|date=October 2021}}, such as for detecting [[Quasar|quasars]].<ref name=":0" /> ...

...s-show-that-fundamental-constants-never-change/#7a3054a847ee|title=Distant Quasars Show That Fundamental Constants Never Change|website=[[Forbes]]|date=5 Janu ...

...5–9 times the average cosmological density at the epochs of the individual quasars.<ref name=":4" /> In 2020 astrophysicists reported the first direct X-ray e ...

...[[X-ray]]s just outside the [[event horizon]]. The large [[luminosity]] of quasars is believed to be a result of gas being accreted by supermassive black hole |title=Galactic Nuclei as Collapsed Old Quasars ...

...and Rees, M. (1998), [http://adsabs.harvard.edu/abs/1998A%26A...331L...1S Quasars and galaxy formation], ''Astronomy and Astrophysics'', '''331''', L1–L4</re ...