Observations of the Lyman series forest towards the redshift 7.1 quasar ULAS J1120+0641. Barnett, R., Warren, S. J., Becker, G. D., Mortlock, D. J., Hewett, P. C., McMahon, R. G., Simpson, C., & Venemans, B. P. ArXiv e-prints, 1702:arXiv:1702.03687, February, 2017.
Paper abstract bibtex 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 \$\{{\textbackslash}rm S/N\}{\textgreater}5\$ is confined to seven narrow spikes in the Ly\${\textbackslash}alpha\$ 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{\textbackslash}sim 6.5\$, \$x_\{\{{\textbackslash}rm HI\}\} {\textgreater} 10{\textasciicircum}\{-4\}\$, similar to limits at redshift \$z{\textbackslash}sim6\$ 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\${\textbackslash}alpha\$ forest is already saturated near \$z{\textbackslash}sim6\$. For higher neutral fractions, other methods such as measuring the red damping wing of the IGM will be required.
@article{barnett_observations_2017,
title = {Observations of the {Lyman} series forest towards the redshift 7.1 quasar {ULAS} {J1120}+0641},
volume = {1702},
url = {http://adsabs.harvard.edu/abs/2017arXiv170203687B},
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 \$\{{\textbackslash}rm S/N\}{\textgreater}5\$ is confined to seven
narrow spikes in the Ly\${\textbackslash}alpha\$ 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{\textbackslash}sim 6.5\$, \$x\_\{\{{\textbackslash}rm HI\}\} {\textgreater}
10{\textasciicircum}\{-4\}\$, similar to limits at redshift \$z{\textbackslash}sim6\$ 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\${\textbackslash}alpha\$ forest is already saturated near \$z{\textbackslash}sim6\$. For higher neutral
fractions, other methods such as measuring the red damping wing of the
IGM will be required.},
urldate = {2017-02-15},
journal = {ArXiv e-prints},
author = {Barnett, R. and Warren, S. J. and Becker, G. D. and Mortlock, D. J. and Hewett, P. C. and McMahon, R. G. and Simpson, C. and Venemans, B. P.},
month = feb,
year = {2017},
keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
pages = {arXiv:1702.03687},
}
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The data nevertheless provide only a weak limit on the volume-weighted hydrogen intergalactic (IGM) neutral fraction at \\$z{\\textbackslash}sim 6.5\\$, \\$x_\\{\\{{\\textbackslash}rm HI\\}\\} {\\textgreater} 10{\\textasciicircum}\\{-4\\}\\$, similar to limits at redshift \\$z{\\textbackslash}sim6\\$ 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\\${\\textbackslash}alpha\\$ forest is already saturated near \\$z{\\textbackslash}sim6\\$. 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The data\nnevertheless provide only a weak limit on the volume-weighted hydrogen\nintergalactic (IGM) neutral fraction at \\$z{\\textbackslash}sim 6.5\\$, \\$x\\_\\{\\{{\\textbackslash}rm HI\\}\\} {\\textgreater}\n10{\\textasciicircum}\\{-4\\}\\$, similar to limits at redshift \\$z{\\textbackslash}sim6\\$ from less distant\nquasars. The new observations cannot extend measurements of the neutral\nfraction of the IGM to higher values because absorption in the\nLy\\${\\textbackslash}alpha\\$ forest is already saturated near \\$z{\\textbackslash}sim6\\$. For higher neutral\nfractions, other methods such as measuring the red damping wing of the\nIGM will be required.},\n\turldate = {2017-02-15},\n\tjournal = {ArXiv e-prints},\n\tauthor = {Barnett, R. and Warren, S. J. and Becker, G. D. and Mortlock, D. J. and Hewett, P. C. and McMahon, R. G. and Simpson, C. and Venemans, B. 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