# The UV spectrum of HS 1700+6416. I. Predicting the metal line content of the far UV spectrum

@article{Fechner2006TheUS,
title={The UV spectrum of HS 1700+6416. I. Predicting the metal line content of the far UV spectrum},
author={Cora Fechner and Dieter Reimers and Antoinette Songaila and Robert A. Simcoe and Michael Rauch and Wallace L. W. Sargent},
journal={Astronomy and Astrophysics},
year={2006},
volume={455},
pages={73-90}
}
• Published 17 May 2006
• Physics
• Astronomy and Astrophysics
Aims. In preparation of a study of the $\ion{He}{ii}$/$\ion{H}{i}$ ratio towards the bright QSO HS 1700+6416, we predict the metal line content of the far-UV spectral range by modelling 18 metal absorption line systems with redshifts $0.2 Methods. For that purpose, we investigate the spectral energy distribution of the metagalactic ionizing radiation field. Simple photoionization models based on 8 different shapes of the ionizing background are tested for each system. The adopted energy… The UV spectrum of HS 1700+6416 - II. FUSE observations of the He II Lyman alpha forest • Physics • 2006 Aims. We present the far-UV spectrum of the quasar HS 1700+6416 taken with FUSE. This QSO provides the second line of sight with the He ii absorption resolved into a Lyα forest structure. Since HS Spectral shape of the UV ionizing background and He II absorption at redshifts 1.8$<$z$<$2.9 • Physics • 2007 Aims. The shape of the UV ionizing background is reconstructed from optically thin metal absorption-line systems identified in spectra of HE 2347–4342, Q 1157+3143, and HS 1700+6416 in the redshift Reconstructing the intergalactic UV background with QSO absorption lines We present a new approach to observationally constraining the spectral energy distribution of the intergalactic UV background by studying metal absorption systems. We study single-component metal Fluctuations of the intergalactic ionization field at redshift z ~ 2 • Physics • 2013 Aims. To probe the spectral energy distribution (SED) of the ionizing background radiation at z 2 and to specify the sources contributing to the intergalactic radiation field. Methods. The spectrum The nature of NV absorbers at high redshift • Physics • 2008 Aims. We present a study of N v absorption systems at 1.5 z 2.5 in the spectra of 19 QSOs, based on data obtained with the VLT/UVES instrument. Our analysis includes both the absorbers arising from THE He II POST-REIONIZATION EPOCH: HST/COS OBSERVATIONS OF THE QUASAR HS1700+6416 • Physics • 2012 The reionization epoch of singly ionized helium (He II) is believed to start at redshifts z {approx} 3.5-4 and be nearly complete by z {approx_equal} 2.7. We explore the post-reionization epoch with The HeII Lyman alpha forest and the thermal state of the IGM • Physics • 2007 Aims. Recent analyses of the intergalactic UV background by means of the Hell Lya forest assume that Hell and H absorption features have the same line widths. We omit this assumption to investigate Fluctuations of the intergalactic UV background towards two lines of sight • Physics • 2007 Aims. We present a reanalysis of the He II Lyα absorption towards the quasars HS 1700+6416 and HE 2347-4342 using new high S/N, optical observations. Methods. An alternative analysis method is The baryon density at z = 0.9-1.9. Tracing the warm-hot intergalactic medium with broad Lyman α absorption • Physics • 2007 Aims. We present an analysis of the Lyman a forests of five quasar spectra in the near UV. Properties of the intergalactic medium (IGM) at an intermediate redshift interval (0.9 ≤ z ≤1.9) are Cosmological radiative transfer and the lonisation of the integalactic medium Gravitational instability during the evolution of the Universe formed a large scale filamentary structure, known as the cosmic web. Baryons embedded in this cosmic web constitute the intergalactic ## References SHOWING 1-10 OF 63 REFERENCES The O/C abundance ratio in absorbing gas clouds at high redshift • Physics Nature • 1992 THE intrinsic extreme ultraviolet (EUV) spectrum of quasars, in which spectral lines of He and CNO ions should appear, is in most cases strongly absorbed by the hydrogen Lyman continuum of A Study of the Reionization History of Intergalactic Helium with FUSE and the Very Large Telescope • Physics • 2003 We obtained high-resolution Far Ultraviolet Spectroscopic Explorer (FUSE; R ~ 20,000) and Very Large Telescope (VLT; R ~ 45,000) spectra of the quasar HE 2347-4342 in order to study the properties of Extremely metal-poor Lyman limit system at$\mathsf{{\vec z}_{abs} = 2.917}\$ toward the quasar HE 0940–1050
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