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11 papers · 2 filters
Optical linear polarization measurements of quasars obtained with the Very Large Telescope at Paranal Observatory
D. Hutsemékers, B. Borguet, D. Sluse +1
We report 87 previously unpublished optical linear polarization measurements of 86 quasars obtained in May and October 2008, and from April to July 2015 with the Focal Reducer and…
LBT/ARGOS adaptive optics observations of z lensed galaxies
M. Perna, M. Curti, G. Cresci +24
Gravitationally lensed systems allow a detailed view of galaxies at high redshift. High spatial- and spectral-resolution measurements of arc-like structures can offer unique constr…
Theoretical study of ArH+ dissociative recombination and electron-impact vibrational excitation
A. Abdoulanziz, F. Colboc, D. A. Little +6
Cross sections are presented for dissociative recombination and electron-impact vibrational excitation of the ArH+ molecular ion at electron energies appropriate for the interstell…
Gaia Data Release 2. Summary of the contents and survey properties
Gaia Collaboration, A. G. A. Brown, A. Vallenari +4
We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources…
A changing-look AGN to be probed by X-ray polarimetry
Beatriz Agís González, Damien Hutsemékers, Giovanni Miniutti
Active galactic nuclei (AGN) produce the highest intrinsic luminosities in the Universe from within a compact region. The central engine is thought to be powered by accretion onto…
Gaia DR2 Gravitational Lens Systems I: New lensed quasar candidates around known quasars
A. Krone-Martins, L. Delchambre, O. Wertz +11
Context. Strong gravitationally lensed quasars are among the most interesting and useful observable extragalactic phenomena. Because their study constitutes a unique tool in variou…