Astrophysical: Galaxies

  • Publication
    Optical and Near-Infrared Calibration of AGN Field Stars: An All-Sky Network of Faint Stars Calibrated on the Landolt System
    We present a total of 12,436 photometric measures of 371 field stars of 26 quasars in the visible (UBVRI) and 22,276 photometric measures of 122 field stars of...
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    Optical and near-infrared imaging of faint Gigahertz Peaked Spectrum sources
    A sample of 47 faint Gigahertz Peaked Spectrum (GPS) radio sources selected from the Westerbork Northern Sky Survey (WENSS) has been imaged in the optical and...
  • Publication
    Optical and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity
    The BL Lacertae object AO 0235+16 is well known for its extreme optical and radio variability. New optical and radio data have been collected in the last four...
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    Optical and X-ray properties of the RIXOS AGN - II. Emission lines
    We present the optical and UV emission-line properties of 160 X-ray-selected active galactic nuclei (AGN) taken from the RIXOS survey (including Hα, Hβ, [Oiii]...
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    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...
  • Publication
    Optical dropout galaxies lensed by the cluster A2667
    Context. We investigate the nature and the physical properties of ten z, Y, and J-dropout galaxies selected in the field of the lensing cluster A2667. Aims...
  • Publication
    Optical imaging for the Spitzer Survey of Stellar Structure in Galaxies. Data release and notes on interacting galaxies
    Context. The Spitzer Survey for Stellar Structure in Galaxies (S4G) and its more recently approved extension will lead to a set of 3.6 and 4.5 μm images for...
  • Publication
    Optical Imaging of 57 spiral galaxies (Knapen+ 2004)
    All B, R, I and Hα images described in the paper are presented electronically, along with the Ks images from Paper I (Knapen et al., 2003MNRAS.344..527K). The...
  • Publication
    Optical Imaging of Very Luminous Infrared Galaxy Systems: Photometric Properties and Late Evolution
    A sample of 19 low-redshift (0.03