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A Survey of Weak MgII Absorbers at 0.4 < z < 2.4
Anand Narayanan, Toru Misawa, Jane C. Charlton +1
We present results from a survey of weak MgII absorbers in the VLT/UVES spectra of 81 QSOs obtained from the ESO archive. In this survey, we identified 112 weak MgII systems within…
The physical properties of the Ly-Alpha forest at z > 1.5
Tae-Sun Kim, Robert F. Carswell, Stefano Cristiani +2
Combining a new, increased dataset of 8 QSOs covering the Ly-alpha forest at redshifts 1.5 < z < 3.6 from VLT/UVES observations with previously published results, we have investiga…
The Extended Emission-Line Region of 4C 37.43
Alan Stockton, John W. MacKenty, Esther M. Hu +1
We have explored the nature of the extended emission-line region around the z=0.37 quasar 4C 37.43, using extensive ground-based and HST imaging and spectroscopy. The velocity fiel…
The enrichment history of the intergalactic medium: O VI in Ly-alpha forest systems at redshift z ~ 2
Robert F. Carswell, Joop Schaye, Tae-Sun Kim
A search for O VI at redshifts corresponding to Ly-alpha lines in the z_em ~ 2.4 QSOs HE1122-1648 and HE2217-2818 reveals that a substantial fraction of those with H I column densi…
The evolution of the physical state of the IGM
Tae-Sun Kim, Stefano Cristiani, Sandro D'Odorico
Using a new, increased dataset of 7 QSOs from VLT/UVES observations combined with one QSO from the literature, the minimum Doppler parameters as a function of neutral hydrogen colu…
Exploring the intergalactic medium with VLT/UVES
S. Cristiani, S. Bianchi, S. D'Odorico +1
The remarkable efficiency of the UVES spectrograph at the VLT has made it possible to push high-resolution, high-S/N ground observations of the Ly-a forest down to z~1.5, gaining n…
Temperature fluctuations in the intergalactic medium
Tom Theuns, Saleem Zaroubi, Tae-Sun Kim +2
The temperature of the low-density intergalactic medium is set by the balance between adiabatic cooling resulting from the expansion of the universe, and photo-heating by the UV-ba…
The contribution of galaxies to the UV ionising background and the evolution of the Lyman forest
Simone Bianchi, Stefano Cristiani, Tae-Sun Kim
We have modelled the evolution of the number of Ly_alpha absorbers with redshift, resulting from the evolution of the ionising background and the Hubble expansion. The contribution…
The Lyman-Alpha Forest at 1.5 < z < 4
Tae-Sun Kim, Stefano Cristiani, Sandro D'Odorico
Using high resolution (R ~ 45000), high S/N (20-50) VLT/UVES observations covering the Lyman-alpha forest at 1.5 < z < 2.4 combined with similar observations at z > 2.4 from the li…
The Redshift Evolution of the Lyman Alpha Forest
Tae-Sun Kim, Esther M. Hu, Lennox L. Cowie +1
We have analyzed the properties of low column density Lyman alpha forest clouds (12.8 < log N_HI < 16.0) toward 5 QSOs at different redshifts, using high signal-to-noise data from…
The Distribution of Column Densities and b Values in the Lyman-Alpha Forest
Esther M. Hu, Tae-Sun Kim, Lennox L. Cowie +2
We describe the properties of the Ly forest in the column density range $\nhi \geq 2\times10^{12}$ cm based on 1056 lines in the wavelength range 4300--5100Åmeasured in e…