We have identified ionized outflows in the narrow-line region of all but one Sloan Digital Sky Survey type 2 quasars (QSO2) at z≲0.1 (20/21, detection rate 95...
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PublicaciónThe triggering mechanism and properties of ionized outflows in the nearest obscured quasars
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PublicaciónThe Value of the Fine Structure Constant over Cosmological Times
The optical spectra of objects classified as QSOs in the Sloan Digital Sky Survey Data Release 6 are analyzed with the aim of determining the value of the fine...
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PublicaciónThe WEBT BL Lacertae Campaign 2000
We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by 24 telescopes in 11 countries. More than 15 000 observations were...
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PublicaciónThe WEBT BL Lacertae Campaign 2001 and its extension. Optical light curves and colour analysis 1994-2002
BL Lacertae has been the target of four observing campaigns by the Whole Earth Blazar Telescope (WEBT) collaboration. In this paper we present UBVRI light...
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PublicaciónThe z = 5 Quasar Luminosity Function from SDSS Stripe 82
We present a measurement of the Type I quasar luminosity function at z = 5 using a large sample of spectroscopically confirmed quasars selected from optical...
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PublicaciónThe z=0.558 absorption system towards PKS 0118-272: A candidate Damped LY α system at low redshift.
We present a study of the MgII absorption system at z=0.558 towards the BL Lac object PKS 0118-272 based on high resolution spectra (λ/{DELTA}λ=~2x10^4^)...
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PublicaciónThrough Thick and Thin—H I Absorption in Cosmological Simulations
We investigate the column density distribution function of neutral hydrogen at redshift z = 3 using a cosmological simulation of galaxy formation from the...
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PublicaciónTime Delay in QSO 0957+561 From 1984-1999 Optical Data
Photometric optical data of QSO 0957+561 covering the period 1984-1999 are analyzed to discern between the two values of the time delay (417 and 424 days)...
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PublicaciónTime Delay of QSO 0957+561 and Cosmological Implications
We obtain the time delay between the arrival time of the A and B images of the QSO 0957+561. The results of applying two different methods (the discrete cross...