Showing 1996Show all
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astro-ph1996
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…
astro-ph1996
Search for Galaxies at z>4 from a Deep Multicolor Survey
E. Giallongo, S. Charlot, S. Cristiani +2
We present deep BVrI multicolor photometry in the field of the quasar BR1202-07 (z_{em}=4.694) aimed at selecting field galaxies at z>4. We compare the observed colors of the galax…