A luminous quasar at a redshift of z = 7.085

Дата и время публикации : 2011-06-30T00:06:43Z

Авторы публикации и институты :
Daniel J. Mortlock (Imperial College London)
Stephen J. Warren (Imperial College London)
Bram P. Venemans (European Southern Observatory)
Mitesh Patel (Imperial College London)
Paul C. Hewett (University of Cambridge)
Richard G. McMahon (University of Cambridge)
Chris Simpson (Liverpool John Moores University)
Tom Theuns (University of Durham, Universiteit Antwerpen)
Eduardo A. Gonzales-Solares (University of Cambridge)
Andy Adamson (Joint Astronomy Centre)
Simon Dye (University of Nottingham)
Nigel C. Hambly (University of Edinburgh)
Paul Hirst (Gemini Observatory)
Mike J. Irwin (University of Cambridge)
Ernst Kuiper (Leiden University)
Andy Lawrence (University of Edinburgh)
Huub J. A. Rottgering (Leiden University)

Ссылка на журнал-издание: Nature, 2011, v474, p616
Коментарии к cтатье: 5 pages, 4 figures; source data available at http://astro.ic.ac.uk/~mortlock/ulas_j1120+0641/
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: The intergalactic medium was not completely reionized until approximately a billion years after the Big Bang, as revealed by observations of quasars with redshifts of less than 6.5. It has been difficult to probe to higher redshifts, however, because quasars have historically been identified in optical surveys, which are insensitive to sources at redshifts exceeding 6.5. Here we report observations of a quasar (ULAS J112001.48+064124.3) at a redshift of 7.085, which is 0.77 billion years after the Big Bang. ULAS J1120+0461 had a luminosity of 6.3×10^13 L_Sun and hosted a black hole with a mass of 2×10^9 M_Sun (where L_Sun and M_Sun are the luminosity and mass of the Sun). The measured radius of the ionized near zone around ULAS J1120+0641 is 1.9 megaparsecs, a factor of three smaller than typical for quasars at redshifts between 6.0 and 6.4. The near zone transmission profile is consistent with a Ly alpha damping wing, suggesting that the neutral fraction of the intergalactic medium in front of ULAS J1120+0641 exceeded 0.1.

Category: Physics