24 papers · 1 filter
Infrared Number Counts of AGN in the GOODS Fields
E. Treister, C. Megan Urry, the GOODS AGN Team
Using the known numbers and evolution of unobscured AGN, and assuming that there is a large number of corresponding obscured AGN -- as expected if AGN unification is correct -- we…
The Lyman-alpha forest according to LUQAS
M. Viel, M. Haehnelt, T. -S. Kim +6
We use the LUQAS sample of 27 high resolution, high signal-to-noise QSO absorption spectra (Kim et al. 2004) and the results from Croft et al. (2002) together with a suite of high-…
Tracing the evolution of massive galaxies up to z \sim 3
M. Longhetti, P. Saracco, S. Cristiani +4
A census of massive galaxies at redshift increasingly higher than 1 may provide strong constraints on the history of mass assembly and of star formation. Here we report on t…
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…
Exploring the Lyman Forest with VLT/UVES
S. Cristiani, S. Bianchi, S. D'Odorico +1
A sample of 8 QSOs with 1.7 < z_em < 3.7 has been observed with VLT/UVES at a typical resolution 45000 and S/N~40-50. Thanks to the two-arm design of the spectrograph, a remarkable…
Parasitic Light in NGST instruments: the accuracy of photometric redshifts and the effect of filter leaks in the visible and near IR camera
S. Cristiani, S. Arnouts, R. A. E. Fosbury
A detailed analysis of NGST multiband photometry applied to the reference case of the study of high-redshift galaxies has been carried out with simulations based on galaxy SEDs der…