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13 papers · 2 filters
An ESO/VLT survey of NIR (Z<=25) selected galaxies at redshifts 4.5<z<6: constraining the cosmic star formation rate near the reionization epoch
A. Fontana, F. Poli, N. Menci +4
We present the results of a VLT and HST imaging survey aimed at the identification of 4.5<z<6 galaxies. In the VLT data, a set of broad and intermediate band filters has been used…
The dusty environment of Quasars. Far-IR properties of Optical Quasars
Paola Andreani, Stefano Cristiani, Andrea Grazian +2
We present the ISO far-IR photometry of a complete sub-sample of optically selected bright quasars belonging to two complete surveys selected through multicolour (U,B,V,R,I) techni…
The All-Sky Asiago-ESO/RASS QSO Survey: Clustering and Luminosity Function
A. Grazian, S. Cristiani, A. Omizzolo
The AERQS is a project aimed at the construction of an all-sky statistically well-defined sample of local (z < 0.3) and bright (R < 15.5) QSOs. Present uncertainties on the theoret…
The Asiago-ESO/RASS QSO Survey II. The Southern Sample
A. Grazian, A. Omizzolo, C. Corbally +3
This is the second paper of a series describing the Asiago-ESO/RASS QSO survey, a project aimed at the construction of an all-sky statistically well-defined sample of very bright Q…
The K20 survey. IV. The redshift distribution of Ks<20 galaxies: a test of galaxy formation models
A. Cimatti, L. Pozzetti, M. Mignoli +11
We present the redshift distribution of a complete sample of 480 galaxies with Ks<20 distributed over two independent fields covering a total area of 52 arcmin^2. The redshift comp…
The K20 survey. III. Photometric and spectroscopic properties of the sample
A. Cimatti, M. Mignoli, E. Daddi +12
The K20 survey is an ESO VLT optical and near-infrared spectroscopic survey aimed at obtaining spectral information and redshifts of a complete sample of about 550 objects to K_s\l…
HST STIS observations of four QSO pairs
B. Aracil, P. Petitjean, A. Smette +3
We present HST STIS observations of four quasar pairs with redshifts 0.84<z_em<1.56 and angular separation 2-3 arcmin corresponding to ~ 1-1.5 h^-1_50 Mpc transverse proper distanc…
High matter density peaks from UVES observations of QSO pairs: correlation properties and chemical abundances
Valentina D'Odorico, Patrick Petitjean, Stefano Cristiani
We study the transverse clustering properties of high matter density peaks as traced by high column density absorption systems (either Lyman limit systems characterized by N(HI)> 2…
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…
ESO for GOODS' sake
A. Renzini, C. Cesarsky, S. Cristiani +6
Currently public ESO data sets pertinent to the CDFS/GOODS field are briefly illustrated along with an indication on how to get access to them. Future ESO plans for complementing t…
Clustering at high redshift
S. Cristiani, S. Arnouts, A. Fontana +2
The addition of deep near infrared images to the database provided by the HDF-S WFPC2 is essential to monitor the SEDs of the objects on a wide baseline and address a number of key…
A Low Upper Limit to the Lyman Continuum Emission of two galaxies at z 3
E. Giallongo, S. Cristiani, S. D'Odorico +1
Long exposure, long-slit spectra have been obtained in the UV/optical bands for two galaxies at z=2.96 and z=3.32 to investigate the fraction of ionizing UV photons escaping from h…
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…