The Detection of Oxygen in the Low-Density Intergalactic Medium

@article{Schaye2000TheDO,
  title={The Detection of Oxygen in the Low-Density Intergalactic Medium},
  author={Joop Schaye and Michael Rauch and Wallace L. W. Sargent and Tae-Sun Kim},
  journal={The Astrophysical Journal},
  year={2000},
  volume={541}
}
The abundances of metals in the intergalactic medium (IGM) can be used to constrain the amount of star formation at high redshift and the spectral shape of the ionizing background radiation. For both purposes, it is essential to measure the abundances in regions of low density, away from local sources of metals and ionizing photons. Here we report the first detection of O VI in the low-density IGM at high redshift. We perform a pixel-by-pixel search for O VI absorption in eight high-quality… Expand

Figures and Tables from this paper

The Spatial Distribution of Metals in the Intergalactic Medium
We investigate the impact of environment on the metallicity of the diffuse intergalactic medium. We use pixel correlation techniques to search for weak C IV and O VI absorption in the spectrum ofExpand
THE IONIZING EFFICIENCY OF THE FIRST STARS
We investigate whether a single population of first stars could have influenced both the metal enrichment and reionization of the high-redshift intergalactic medium (IGM) by calculating the generatedExpand
METALLICITY OF THE INTERGALACTIC MEDIUM USING PIXEL STATISTICS. II. THE DISTRIBUTION OF METALS AS TRACED BY C IV
We measure the distribution of carbon in the intergalactic medium as a function of redshift z and overdensity δ. Using a hydrodynamical simulation to link the H I absorption to the density andExpand
The Enrichment History of the Intergalactic Medium: O VI in Lyα Forest Systems at Redshift z ~ 2*
A search for O VI 1031.93, 1037.62 ? at redshifts corresponding to Ly? lines in the zem ~ 2.4 QSOs HE 1122-1648 and HE 2217-2818 reveals that a substantial fraction of those with H I column densitiesExpand
Metallicity of the Intergalactic Medium Using Pixel Statistics. III. Silicon
Studies of absorption spectra of high-z QSOs have revealed that the intergalactic medium at z ~ 2-3 is enriched to ~10-3 to 10-2 Z☉ for gas densities more than a few times the mean cosmic density butExpand
The filling factor of intergalactic metals at redshift z= 3
Observations of quasar absorption-line systems reveal that the z= 3 intergalactic medium (IGM) is polluted by heavy elements down to H i optical depths τH I≪ 10. What is not yet clear, however, isExpand
THE SURPRISINGLY CONSTANT STRENGTH OF O VI ABSORBERS OVER COSMIC TIME
O VI absorption is observed in a wide range of astrophysical environments, including the local interstellar medium, the disk and halo of the Milky Way, high-velocity clouds, the Magellanic Clouds,Expand
The Sources of intergalactic metals
We study the clustering properties of metals in the intergalactic medium (IGM) as traced by 619 Civ and 81 Siiv absorption components with N ≥ 10 12 cm -2 and 316 Mg II and 82 Fell absorptionExpand
Metallicity of the Intergalactic Medium Using Pixel Statistics: I. Method
Studies of absorption spectra of high-z QSOs have revealed that the intergalactic medium at z ~ 2-3 is enriched to ~ 0.1%-1% solar for gas densities more than a few times the mean cosmic density, butExpand
Pixel correlation searches for O vi in the Lyman α forest and the volume filling factor of metals in the intergalactic medium at z ∼ 2-3.5
Artificial absorption spectra are used to test a variety of instrumental and physical effects on the pixel correlation technique for the detection of weak O vi absorption. At H i optical depthsExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 17 REFERENCES
Constraining the Metallicity of the Low-Density Lyα Forest Using O VI Absorption
We present a systematic search for O VI (1032, 1037 A) absorption in a Keck High-Resolution Echelle Spectrometer spectrum of the z = 3.62 quasar Q1422+231, with the goal of constraining theExpand
Heavy-element enrichment in low-density regions of the intergalactic medium
TLDR
Analysing carbon and oxygen absorption lines in quasar spectra allows us to probe the heavy-element abundances at a redshift of three within low-density regions of intergalactic gas and finds that the ratio of triply ionized carbon to neutral hydrogen is roughly constant over a wide range of densities. Expand
The Hubble Space Telescope quasar absorption line key project. 6: Properties of the metal-rich systems
We present an analysis of the properties of a sample of 18 metal-rich, low-redshift z(sub abs) much less than z(sub em) absorbers seen in low- and medium-resolution spectra obtained for the QuasarExpand
Where Are the Baryons
New high-resolution, large-scale cosmological hydrodynamic galaxy formation simulations of a standard cold dark matter model (with a cosmological constant) are utilized to predict the distribution ofExpand
Equation of state of the photoionized intergalactic medium
We develop an efficient method to study the effects of reionization history on the temperature-density relation of the intergalactic medium in the low density limit (overdensity less than 5). It isExpand
QSO Metal Absorption Systems at High Redshift and the Signature of Hierarchical Galaxy Formation
In a hierarchical cosmogony, galaxies build up by continuous merging of smaller structures. At z = 3, the matter content of a typical present-day galaxy is dispersed over several individual clumpsExpand
The Detection of Highly Ionized Gas via O VI Absorption toward QSO HS 1422+2309
We have detected O VI absorption in a Lyman limit system at z=3.3816 toward QSO HS 1422+2309. We have also detected C IV absorption, but we have not seen N V, Si IV, or C II. The line widths of O VIExpand
Keck High Resolution Spectroscopy of PKS 0123+257: Intrinsic Absorption in a Radio-Loud Quasar
We present results from Keck I high resolution spectroscopy of the radio loud quasar PKS 0123+257 ($z_e$=2.364, V=17.5). In this object we detect Ly$\alpha$, N V 1238,1242, Si IV 1393,1402, and C IVExpand
The Observability of Metal Lines Associated with the Lyα Forest
We develop a prescription for characterizing the strengths of metal lines associated with Lyα forest absorbers (LYFAs) of a given neutral hydrogen column density NH I and metallicity [O/H]. This lineExpand
The Cosmological Density and Ionization of Hot Gas: O VI Absorption in Quasar Spectra
We have conducted the first survey for Oxygen VI $\lambda\lambda 1032,1038$ absorption lines in QSO spectra. We used medium resolution ($R \approx 1300$) high signal-to-noise ($\approx 20$) FaintExpand
...
1
2
...