Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ∼ 6 Quasars. II. A Sample of 19 Quasars

@article{Fan2005ConstrainingTE,
  title={Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ∼ 6 Quasars. II. A Sample of 19 Quasars},
  author={Xiaohui Fan and Michael A. Strauss and Robert H. Becker and Richard L. White and James E. Gunn and Gillian R. Knapp and Gordon T. Richards and Donald P. Schneider and Jonathan Brinkmann and Masataka Fukugita},
  journal={The Astronomical Journal},
  year={2005},
  volume={132},
  pages={117 - 136}
}
We study the evolution of the ionization state of the intergalactic medium (IGM) at the end of the reionization epoch using moderate-resolution spectra of a sample of 19 quasars at 5.74 < zem < 6.42 discovered in the Sloan Digital Sky Survey. Three methods are used to trace IGM properties: (1) the evolution of the Gunn-Peterson (GP) optical depth in the Lyα, Lyβ, and Lyγ transitions; (2) the distribution of lengths of dark absorption gaps; and (3) the size of H II regions around luminous… 

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References

SHOWING 1-10 OF 109 REFERENCES

Evolution of the Ionizing Background and the Epoch of Reionization from the Spectra of z ∼ 6 Quasars

We study the process of cosmic reionization and estimate the ionizing background in the intergalactic medium (IGM) using the Lyman series absorption in the spectra of the four quasars at 5.7 < z <

Evidence for Reionization at z ∼ 6: Detection of a Gunn-Peterson Trough in a z = 6.28 Quasar

We present moderate-resolution Keck spectroscopy of quasars at z = 5.82, 5.99, and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Lyα absorption in the spectra of these

The Detectability of High-Redshift Lyα Emission Lines prior to the Reionization of the Universe

For a source of Lyα radiation embedded in a neutral intergalactic medium (IGM) prior to the reionization epoch, the Lyα emission line is strongly suppressed by the intervening IGM. The damping wing

Evolution of the Ionizing Radiation Background and Star Formation in the Aftermath of Cosmological Reionization

The temporal evolution of the ionizing UV background radiation field at high redshift provides a probe of the evolution of the early star formation rate. By comparing the observed levels of

A Uniform Analysis of the Lyα Forest at z = 0-5. V. The Extragalactic Ionizing Background at Low Redshift

In Paper III of our series, "A Uniform Analysis of the Lyα Forest at z = 0-5," we presented a set of 270 quasar spectra from the archives of the Faint Object Spectrograph (FOS) on the Hubble Space

On the Threshold of the Reionization Epoch

Discovery of the cosmic reionization epoch would represent a significant milestone in cosmology. We present Keck spectroscopy of the quasar SDSS 1044-0125, at z = 5.73. The spectrum shows a dramatic

Constraints on the ionization sources of the high‐redshift intergalactic medium

Constraints on the ionization structure of the intergalactic medium (IGM) are derived as directly imposed by observations in conjunction with the results of numerical simulations for structure

VLT Optical and Near-Infrared Observations of the z = 6.28 Quasar SDSS J1030+0524

We present new VLT spectroscopic observations of the most distant quasar known, SDSS J1030+0524 at z = 6.28, which was recently discovered by the Sloan Digital Sky Survey. We confirm the presence of

A Galaxy at z = 6.545 and Constraints on the Epoch of Reionization

We report the discovery of a Lyα-emitting galaxy at redshift z = 6.545 serendipitously identified in the course of spectroscopic follow-up of hard X-ray sources on behalf of the Serendipitous

Probing the Reionization History Using the Spectra of High-Redshift Sources

We quantify and discuss the footprints of neutral hydrogen in the intergalactic medium (IGM) on the spectra of high-redshift (z ~ 6) sources, using mock spectra generated from hydrodynamical
...