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Hans Publishers, Astronomy & Astrophysics, (601), p. A16

DOI: 10.1051/0004-6361/201630258

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Observations of the Lyman series forest towards the redshift 7.1 quasar ULAS J1120+0641

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Postprint: archiving forbidden
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Data provided by SHERPA/RoMEO

Abstract

We present a 30h integration Very Large Telescope X-shooter spectrum of the Lyman series forest towards the $z = 7.084$ quasar ULAS J1120+0641. The only detected transmission at ${\rm S/N}>5$ is confined to seven narrow spikes in the Ly$α$ forest, over the redshift range $5.858 5.5$. The data nevertheless provide only a weak limit on the volume-weighted hydrogen intergalactic (IGM) neutral fraction at $z∼ 6.5$, $x_{{\rm HI}} > 10^{-4}$, similar to limits at redshift $z∼6$ from less distant quasars. The new observations cannot extend measurements of the neutral fraction of the IGM to higher values because absorption in the Ly$α$ forest is already saturated near $z∼6$. For higher neutral fractions, other methods such as measuring the red damping wing of the IGM will be required. ; Comment: Accepted for publication in A&A. 11 pages, 10 figures