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astro-ph.CO2011★ 122 cited
Improved measurements of the intergalactic medium temperature around quasars: possible evidence for the initial stages of He-II reionisation at z~6
James S. Bolton, George D. Becker, Sudhir Raskutti +3
We present measurements of the intergalactic medium (IGM) temperature within ~5 proper Mpc of seven luminous quasars at z~6. The constraints are obtained from the Doppler widths of…
astro-ph.CO2011★ 212 cited
How neutral is the intergalactic medium surrounding the redshift z=7.085 quasar ULAS J1120+0641?
James S. Bolton, Martin G. Haehnelt, Stephen J. Warren +5
The quasar ULAS J1120+0641 at redshift z=7.085 has a highly ionised near zone which is smaller than those around quasars of similar luminosity at z~6. The spectrum also exhibits ev…