30 citations · 35 across the 3 of their papers we have counts for
3 papers
Quasars as high-redshift standard candles
Guido Risaliti, Elisabeta Lusso, Emanuele Nardini +5
In the past few years, we built a Hubble diagram of quasars up to redshift z7, based on the nonlinear relation between quasars' x-ray and UV luminosities. Such a Hubble diagr…
Quasars as high-redshift standard candles
A. Sacchi, G. Risaliti, M. Signorini +10
The non-linear relation between the X-ray and ultraviolet (UV) luminosity in quasars has been used to derive quasar distances and to build a Hubble diagram at redshifts up to $z\si…
Simultaneous intensive photometry and high resolution spectroscopy of delta Scuti stars IV. An improved picture of the pulsational behaviour of X Caeli
Luciano Mantegazza, Filippo M. Zerbi, Alberto Sacchi
The delta Scuti star X Caeli has been the target of a simultaneous photometric (14 consecutive nights) and spectroscopic campaign (8 consecutive nigths). From the analysis of light…