Radiative Transfer in a Clumpy Universe. III. The Nature of Cosmological Ionizing Sources

@article{Madau1999RadiativeTI,
  title={Radiative Transfer in a Clumpy Universe. III. The Nature of Cosmological Ionizing Sources},
  author={Piero Madau and Francesco Haardt and Martin J. Rees},
  journal={The Astrophysical Journal},
  year={1999},
  volume={514},
  pages={648 - 659}
}
The history of the transition from a neutral intergalactic medium (IGM) to one that is almost fully ionized can reveal the character of cosmological ionizing sources. We study the evolution of the volume filling factors of H II and He III regions in a clumpy IGM and discuss the implications for rival reionization scenarios of the rapid decline observed at z≳3 in the space density of optical and radio-loud quasars and of the large population of star-forming galaxies recently discovered at the… 
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References

SHOWING 1-10 OF 96 REFERENCES
Signatures of Stellar Reionization of the Universe
The high ionization level and nonzero metallicity (~1% Z☉) of the intergalactic gas at redshifts z ≲ 5 implies that nonlinear structure had started to form in the universe at earlier times than we
Measurement of the opacity of ionized helium in the intergalactic medium
DETERMINATION of the density and ionization state of diffuse primordial gas in the intergalactic medium (IGM) is an important step towards understanding the nature of dark matter and the formation of
Radiative Transfer in a Clumpy Universe. II. The Ultraviolet Extragalactic Background
We present a detailed calculation of the propagation of AGN-like ionizing radiation through the intergalactic space. We model the ionization state of absorbing clouds, and show that the universe will
Radiative transfer in a clumpy universe: The colors of high-redshift galaxies
We assess the effects of the stochastic attenuation produced by intervening QSO absorption systems on the broadband colors of galaxies at cosmological distances. We compute the H I opacity of a
COSMOLOGICAL H II REGIONS AND THE PHOTOIONIZATION OF THE INTERGALACTIC MEDIUM.
The generalization of the classical H II region problem to the case of a point source of ionizing radiation in a cosmologically expanding gas in a Friedmann-Robertson-Walker universe is summarized.
Synthetic properties of starburst galaxies
We present the results of an extensive grid of evolutionary synthesis models for populations of massive stars. The parameter space has been chosen to correspond to conditions typically found in
High-redshift galaxies, their active nuclei and central black holes
We demonstrate that the luminosity function of the recently detected population of actively star-forming galaxies at redshift z = 3 and the B-band luminosity function of quasi-stellar objects (QSOs)
21 Centimeter Tomography of the Intergalactic Medium at High Redshift
We investigate the 21 cm signature that may arise from the intergalactic medium (IGM) prior to the epoch of full reionization (z > 5). In scenarios in which the IGM is reionized by discrete sources
The Redshift Evolution of the Metagalactic Ionizing Flux Inferred from Metal Line Ratios in the Lyman Forest
Metal line ratios in a sample of 13 quasar spectra obtained with the HIRES spectrograph on the Keck I Telescope have been analyzed to characterize the evolution of the metagalactic ionizing flux near
The Star Formation History of Field Galaxies
We develop a method for interpreting faint galaxy data which focuses on the integrated light radiated from the galaxy population as a whole. The emission history of the universe at ultraviolet,
...
...