Astrophysical: Galaxies

  • Publication
    A Large Brightness Enhancement of the QSO 0957+561 A Component
    We report an increase of more than 0.2 mag in the optical brightness of the leading image (A) of the gravitational lens Q0957+561, detected during the 2000...
  • Publication
    A large optical and infrared outburst in OJ 287.
    Extensive infrared observations were taken of OJ 287 in 1993/94 as part of an on-going monitoring campaign of this object started in 1988. The data show that...
  • News
    A large tidal stream observed in the Sombrero galaxy
    According to the latest cosmological models, large spiral galaxies such as the Milky Way grew by absorbing smaller galaxies, by a sort of galactic cannibalism...
  • Publication
    A linear-filter approach to extracting the Rees-Sciama effect in merging clusters of galaxies
    We discuss the prospects for detecting the Rees-Sciama (RS) effect associated with merging clusters of galaxies in millimetric observations. Using the extended...
  • Publication
    A logNHI = 22.6 Damped Lyα Absorber in a Dark Gamma-Ray Burst: The Environment of GRB 050401
    The optical afterglow spectrum of GRB 050401 (at z=2.8992+/-0.0004) shows the presence of a damped Lyα absorber (DLA), with logNHI=22.6+/-0.3. This is the...
  • Publication
    A long-wavelength view on galaxy evolution from deep surveys by the Infrared Space Observatory
    We discuss the constraints set on galaxy evolution by a variety of data from deep extragalactic surveys performed in the mid-IR and far-IR with the Infrared...
  • Publication
    A low mass cluster of extremely red galaxies at z = 1.10 in the GOODS Southern Field
    We have studied the spatial clustering of high redshift (z > 1) extremely red objects (EROs) as a function of photometric redshift in the GOODS Southern Field...
  • Publication
    A lower bound on intergalactic magnetic fields from time variability of 1ES 0229+200 from MAGIC and Fermi/LAT observations
    Context. Extended and delayed emission around distant TeV sources induced by the effects of propagation of γ ray s through the intergalactic medium can be used...
  • Publication
    A lower limit to the accretion disc radius in the low-luminosity AGNNGC 1052 derived from high-angular resolution data
    We investigate the central sub-arcsec region of the low-luminosity active galactic nucleusNGC 1052, using a high-angular resolution data set that covers 10...