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Airtist's renderin o ULAS J1120+0641, a very distant quasar pouered bi a black hole wi a mass twa billion times that o the Sun.[1] Credit: ESO/M. Kornmesser

Quasars or quasi-stellar radio soorces are the maist energetic an distant memmers o a cless o objects cried active galactic nuclei (AGN). Quasars are extremely luminous an war first identifee'd as bein heich reidshift soorces o electromagnetic energy, includin radio waves an veesible licht, that appeared tae be seemilar tae starns, rather nor extendit soorces seemilar tae galaxies. Thair spectra conteen very broad emission lines, unlik ony kent frae starns, hence the name "quasi-stellar." Their luminosity can be 100 times greater nor that o the Milky Way.[2] Accordin tae maist scientists, maist quasars war formed approximately 12 billion years ago, an thay are normally caused bi collisions o galaxies, wi the galaxies' central black holes mergin tae form either a supermassive black hole[3] or a binary black hole seestem.

References[eedit | eedit soorce]

  1. "Most Distant Quasar Found". ESO Science Release. Retrieved 4 Julie 2011. 
  2. Greenstein, Jesse L.; Schmidt, Maarten (1964). "The Quasi-Stellar Radio Sources 3C 48 and 3C 273". The Astrophysical Journal. 140: 1. Bibcode:1964ApJ...140....1G. doi:10.1086/147889. 
  3. "HubbleSite - NewsCenter - Hubble Sees the 'Teenage Years' of Quasars (06/18/2015) - Introduction". hubblesite.org. Retrieved 2015-06-19.