Astrophysical: Galaxies

  • Publication
    On the Stellar Content of the Starburst Galaxy IC10
    We investigate the stellar content of the starburst dwarf galaxy IC10 using accurate and deep optical data collected with the Advanced Camera for Surveys and...
  • Publication
    On the use of photometric redshifts for X-ray selected AGNs
    In this paper we present photometric redshift estimates for a sample of X-ray selected sources detected in the wide-field ( 2 deg^2), bright [ f_X(0.5{-}8 keV)...
  • Publication
    On the Use of the Index N2 to Derive the Metallicity in Metal-poor Galaxies
    The N2 index ([N II] λ6584/Hα) is used to determine emission line galaxy metallicities at all redshifts, including high redshift, where galaxies tend to be...
  • Publication
    On the α-Element Abundance Gradients in the Disk of the Sculptor Spiral Galaxy NGC 300
    We have carried out a detailed spectral analysis of six early B-type supergiants in the Sculptor Group spiral galaxy NGC 300. To this end, we used state-of-the...
  • Publication
    Ongoing star formation at the outskirts of Sextans A: spectroscopic detection of early O-type stars
    With both nebular- and stellar-derived abundances of ≲1/10 Z_{⊙ } and low foreground extinction, Sextans A is a prime candidate to replace the Small Magellanic...
  • Publication
    Optical analysis of the poor clusters Abell 610, Abell 725, and Abell 796, containing diffuse radio sources
    Aims: We study the dynamical status of the poor, low X-ray luminous galaxy clusters Abell 610, Abell 725, and Abell 796 (at z = 0.1, 0.09, and 0.16...
  • Publication
    Optical and infrared diagnostics of SDSS galaxies in the SWIRE survey
    We present the rest-frame optical and infrared colours of a complete sample of 1114 z 0.3 galaxies from the Spitzer Wide-Area Infrared Extragalactic (SWIRE)...
  • 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...
  • Publication
    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...