8 papers · 1 filter
Some comments on the paper "Filter design for the detection of compact sources based on the Neyman-Pearson detector" by M. Lopez-Caniego et. al (2005, MNRAS 359, 993)
R. Vio, P. Andreani
In this note we stress the necessity of a careful check of both the theoretical arguments and the numerical experiments used by Lopez-Caniego et al. (2005) to support the superior…
New Clues on the Nature of Extremely Red Galaxies
A. Cimatti, E. Daddi, S. di Serego Alighieri +7
We present near-infrared VLT-UT1+ISAAC spectroscopy of a sample of 9 extremely red galaxies (ERGs) with R-K>5 and K<19.0. Neither strong emission lines (F_lim<1-5 10^{-16} erg s^{-…
Extremely Red Galaxies: Old or Dusty ?
Andrea Cimatti, Paola Andreani, Huub Röttgering +1
The nature of the extremely red galaxies is poorly known, the critical issue being whether they are old ellipticals at or distant star-forming galaxies strongly reddened by…
The luminosity function and clustering evolution of Quasars
S. Cristiani, F. La Franca, P. Andreani
Recent results have questioned the description of the QSO luminosity function in terms of a pure luminosity evolution and call for a luminosity dependent luminosity evolution. Meas…
The evolution of the clustering of QSOs
F. La Franca, P. Andreani, S. Cristiani
The evolution of QSO clustering is investigated with a new sample of 388 QSOs with 0.3<z<2.2, B<20.5 and M_B<-23. Evidence is found for an increase of the clustering amplitude with…
The optical variability of QSOs. II. The wavelength dependence
S. Cristiani, S. Trentini, F. La Franca +1
The long-term variability of a sample of 149 optically selected QSOs in the field of the Selected Area 94 has been studied in the R-band. The relations between variability and lumi…