5/17/2023 0 Comments Black hole quasar![]() A catalog of quasar properties from Sloan Digital Sky Survey data release 7. SDSS quasars in the WISE preliminary data release and quasar candidate selection with optical/infrared colours. The Wide-field Infrared Survey Explorer (WISE): mission description and initial on-orbit performance. The Sloan Digital Sky Survey: technical summary. Observational constraints on cosmic reionization. ![]() On the density of neutral hydrogen in intergalactic space. The formation and evolution of massive black holes. Black hole mass estimates and emission-line properties of a sample of redshift z >6.5 quasars. Evidence for non-evolving Fe II/Mg II ratios in rapidly accreting z ∼ 6 QSOs. Eddington-limited accretion and the black hole mass function at redshift 6. Black hole masses and enrichment of z ∼ 6 SDSS quasars. A 3 × 10 9 black hole in the quasar SDSS J1148+5251 at z = 6.41. Discovery of eight z ∼ 6 quasars from Pan-STARRS. Discovery of three z > 6.5 quasars in the VISTA Kilo-Degree Infrared Galaxy (VIKING) Survey. A luminous quasar at a redshift of z = 7.085. The Canada-France high-z quasar survey: nine new quasars and the luminosity function at redshift 6. A survey of z ∼ 6 quasars in the Sloan Digital Sky Survey deep stripe. Four quasars above redshift 6 discovered by the Canada-France high-z quasar survey. Gemini near-infrared spectroscopy of luminous z ∼ 6 quasars: chemical abundances, black hole masses, and Mg II absorption. Discovery of three additional quasars at z > 6. A survey of z > 5.7 quasars in the Sloan Digital Sky Survey. ![]() We estimate (on the basis of a near-infrared spectrum) that the black hole has a mass of ∼1.2 × 10 10, which is consistent with the 1.3 × 10 10 derived by assuming an Eddington-limited accretion rate.įan, X. On the basis of the deep absorption trough 15 on the blue side of the Lyman-α emission line in the spectrum, we estimate the proper size of the ionized proximity zone associated with the quasar to be about 26 million light years, larger than found with other z > 6.1 quasars with lower luminosities 16. It has an optical and near-infrared luminosity a few times greater than those of previously known z > 6 quasars. Here we report the discovery of an ultraluminous quasar, SDSS J010013.02+280225.8, at redshift z = 6.30. The existence of such black holes when the Universe was less than one billion years old presents substantial challenges to theories of the formation and growth of black holes and the coevolution of black holes and galaxies 14. Each quasar contains a black hole with a mass of about one billion solar masses (10 9 ) 2, 6, 7, 9, 10, 11, 12, 13. So far, roughly 40 quasars with redshifts greater than z = 6 have been discovered 1, 2, 3, 4, 5, 6, 7, 8. ![]()
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