IONIZATION NEAR ZONES ASSOCIATED WITH QUASARS AT z ∼ 6 ∗

@article{Carilli2010IONIZATIONNZ,
  title={IONIZATION NEAR ZONES ASSOCIATED WITH QUASARS AT z ∼ 6 ∗},
  author={Christopher L. Carilli and Ran Wang and X. L. Fan and Fabian Walter and Jaron Daniel Kurk and Dominik A. Riechers and Jeff Wagg and Joseph F. Hennawi and L. Jiang and K.M.Menten and Frank Bertoldi and Michael A. Strauss and Pierre Cox},
  journal={The Astrophysical Journal},
  year={2010},
  volume={714},
  pages={834-839}
}
We analyze the size evolution of H II regions around 27 quasars between z = 5.7 and 6.4 ("quasar near zones" or NZs). We include more sources than previous studies, and we use more accurate redshifts for the host galaxies, with eight CO molecular line redshifts and nine Mg II redshifts. We confirm the trend for an increase in NZ size with decreasing redshift, with the luminosity-normalized proper size evolving as R _(NZ,corrected) = (7.4 ± 0.3) – (8.0 ± 1.1) × (z – 6) Mpc. While derivation of… Expand

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References

SHOWING 1-10 OF 50 REFERENCES
On the size of H II regions around high-redshift quasars
We investigate the possibility of constraining the ionization state of the intergalactic medium (IGM) close to the end of reionization (z ≈ 6) by measuring the size of H II regions in high-z quasarExpand
Black Hole Masses and Enrichment of z ~ 6 SDSS Quasars*
We present sensitive near-infrared spectroscopic observations for a sample of five z ~ 6 quasars. These quasars are among the most distant, currently known quasars in the universe. The spectra haveExpand
Resolved molecular gas in a quasar host galaxy at redshift z = 6.42
We present high-resolution Very Large Array (VLA) observations of the molecular gas in the host galaxy of the highest redshift quasar currently known, SDSS J1148+5251 (z = 6.42). Our VLA data of theExpand
Quasar Proximity Zones and Patchy Reionization
Lyα forest absorption spectra toward quasars at z ~ 6 show regions of enhanced transmission close to their source. Several authors have argued that the apparently small sizes of these regionsExpand
IMPROVED CONSTRAINTS ON THE NEUTRAL INTERGALACTIC HYDROGEN SURROUNDING QUASARS AT REDSHIFTS z > 6
We analyze the evolution of H II regions around the seven known SDSS quasars at z > 6. The comparison between the observed and model radii of the H II regions generated by these quasars individuallyExpand
The nature and evolution of the highly ionized near-zones in the absorption spectra of z≃ 6 quasars
We use state-of-the-art hydrodynamical simulations combined with a one-dimensional radiative transfer code to assess the extent to which the highly ionized regions observed close to z ≃ 6 quasars,Expand
High-excitation CO in a quasar host galaxy at z = 6.42
We report the detection of high excitation CO emission from the most distant quasar currently known, SDSS J114816.64+525150.3 (hereafter J1148+5251), at a redshift z= 6:419. The CO (J= 6! 5) and (J=Expand
A closer look at using quasar near-zones as a probe of neutral hydrogen in the intergalactic medium
We examine a large set of synthetic quasar spectra to realistically assess the potential of using the relative sizes of highly ionized near-zones in the Lyα and Lyβ forest as a probe of the neutralExpand
Gemini Near-Infrared Spectroscopy of Luminous z ∼ 6 Quasars: Chemical Abundances, Black Hole Masses, and Mg II Absorption*
We present Gemini near-infrared spectroscopic observations of six luminous quasars at z = 5.8 to ~6.3. Five of them were observed using Gemini South GNIRS, which provides a simultaneous wavelengthExpand
Evidence of a cosmological Strömgren surface and of significant neutral hydrogen surrounding the Quasar SDSS J1030+0524
A bright quasar residing in a dense and largely neutral intergalactic medium at high redshifts (z 6) will be surrounded by a large cosmological Stromgren sphere. The quasar's spectrum will then showExpand
...
1
2
3
4
5
...