We present spectroscopic observations of six optical counterparts of ultraluminous X-ray sources (ULXs) around nearby galaxies. The spectra of the six objects...
The near-IR properties and continuum shapes of high redshift quasars from the Sloan Digital Sky Survey
We present J-H-K' photometry for a sample of 45 high redshift quasars found by the Sloan Digital Sky Survey. The sample was originally selected on the basis of...
The optical and UV spectrum of the Seyfert type 2 galaxy NGC 3393
The combined UV and optical spectrum of the Seyfert type 2 galaxy NGC 3393 is presented and analyzed together with published IR and IRAS data. The conditions in...
The behavior of the light curve of 3C 345 is analyzed using all B magnitudes available in the literature, thus extending the number of points in the compiled...
B-magnitudes have been compiled from the literature for 3C 345, covering a period from 1965 to 1980, 905 values in all. Since the last major study of the light...
The publication by Lloyd (1984) of new and revised data for a sample of active nuclei brought the number of published observations of 3C 345 up to over 900...
The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
Context. The evolution of galaxies through cosmic time is studied observationally by means of extragalactic surveys. The usefulness of these surveys is greatly...
The Peculiar Optical Spectrum of 4C+22.25: Imprint of a Massive Black Hole Binary?
We report the discovery of peculiar features in the optical spectrum of 4C+22.25, a flat spectrum radio quasar at z = 0.4183 observed in the Sloan Digital Sky...
The photometric properties and stellar populations in extremely red galaxies
We study the morphology and masses of extremely red galaxies (EROs) within the GOYA survey (Galaxy Origins and Young Assembly), by combining optical data (UBVI)...