Optical Counterparts of Ultraluminous X-Ray Sources
We present the optical identification and characterization of counterparts of four objects previously cataloged as ultraluminous X-ray (ULX) sources. The...
Optical Microvariability in Quasars: Spectral Variability
We present a method that we developed to discern where the optical microvariability (OM) in quasars originates: in the accretion disk (related to thermal...
We present results from a project focused on searching optical microvariabilty (also known as ``intra-night'' variability) in type 2 - obscured - quasars...
Observations of the gravitational lens system 0957+561A, B in the R band are presented in this Letter. The observations, taken with the 82 cm IAC-80 telescope...
Optical spectroscopy of microquasar candidates at low Galactic latitudes
We report optical spectroscopic observations of a sample of 6 low-galactic latitude microquasar candidates selected by cross-identification of X-ray and radio...
Optimal 1D Ly α forest power spectrum estimation - III. DESI early data
The 1D power spectrum P 1D of the Ly α forest provides important information about cosmological and astrophysical parameters, including constraints on warm dark...
Overdensity of galaxies in the environment of quasar pairs
We report on a study of the galaxy environments of low redshift physical quasars pairs. We selected 20 pairs having projected separation 0.5 Mpc and difference...
OzDES Reverberation Mapping Program: Hβ lags from the 6-yr survey
Reverberation mapping measurements have been used to constrain the relationship between the size of the broad-line region and luminosity of active galactic...
OzDES reverberation mapping program: Lag recovery reliability for 6-yr C IV analysis
We present the statistical methods that have been developed to analyse the OzDES reverberation mapping sample. To perform this statistical analysis we have...