We review observations of ultraluminous X-ray sources (ULXs). X-ray spectroscopic and
timing studies of ULXs suggest a new accretion state distinct from those seen in Galactic …

Despite much recent theoretical and observational progress in our knowledge of the early
universe, many fundamental questions remain only partially answered. Here, we review the …

We present a dense grid of evolutionary tracks and isochrones of rotating massive main-
sequence stars. We provide three grids with different initial compositions tailored to compare …

We present the most extensive and complete study of the properties for the largest sample
(46 objects) of gamma-ray burst (GRB) host galaxies. The redshift interval and the mean …

We present a sample of 77 optical afterglows (OAs) of Swift detected gamma-ray bursts
(GRBs) for which spectroscopic follow-up observations have been secured. Our first …

We present data and initial results from VLT/X-Shooter emission-line spectroscopy of 96
galaxies selected by long γ-ray bursts (GRBs) at 0.1< z< 3.6, the largest sample of GRB host …

We present a model for the formation of massive black holes (∼ 1000 M☉) due to stellar-
dynamical processes in the first stellar clusters formed at early cosmic times (z∼ 10–20) …

We have gathered optical photometry data from the literature on a large sample of Swift-era
gamma-ray burst (GRB) afterglows including GRBs up to 2009 September, for a total of 76 …

Long-duration gamma-ray bursts (GRBs) are powerful tracers of star-forming galaxies. We
have defined a homogeneous subsample of 69 Swift GRB-selected galaxies spanning a …

We present optical and near-infrared photometry of the afterglow of the long gamma-ray
burst (GRB) 070802 at redshift 2.45 obtained with the ESO/MPI 2.2 m telescope equipped …