Astrophysical: Galaxies

  • Publication
    The role of grain size in active galactic nuclei torus dust models
    Context. Active galactic nuclei (AGN) are surrounded by dust within the central parsecs. The dusty circumnuclear structures, referred to as the torus, are...
  • Publication
    The Role of Mergers in Galaxy Evolution
    In the last decade the importance of mergers in the evolution of galaxies has become evident. In this paper we illustrate this importance by showing examples of...
  • Publication
    The role of stellar radial motions in shaping galaxy surface brightness profiles
    Aims: The physics driving features such as breaks observed in galaxy surface brightness (SB) profiles remains contentious. Here, we assess the importance of...
  • Publication
    The Role of the Accretion Disk, Dust, and Jets in the IR Emission of Low-luminosity Active Galactic Nuclei
    We use recent high-resolution infrared (IR; 1-20 μm) photometry to examine the origin of the IR emission in low-luminosity active galactic nuclei (LLAGN). The...
  • Publication
    The ROSAT International X-ray/Optical Survey (RIXOS): source catalogue
    We describe the ROSAT International X-ray/Optical Survey (RIXOS), a medium-sensitivity survey and optical identification of X-ray sources discovered in ROSAT...
  • Publication
    The ROSAT UK medium sensitivity survey.
    The authors present the first results on the optical identification of 89 ROSAT sources on the second Lockman hole. Because of the low Galactic H I column...
  • Publication
    The ROSAT UK Medium Sensitivity Survey: optical identification and relation to X-ray spectral properties
    We present the first results on the optical identification of 89 sources with S(0.5-2 keV)>=1.7x10^-14 erg s^-1 cm^-2 detected in eight ROSAT Position Sensitive...
  • Publication
    The RR Lyrae distance scale from near-infrared photometry: current results .
    We present new observational results on the RR Lyrae K-band Period-Luminosity relation (PLK). Data on the Galactic globular clusters NGC 3201 and NGC 4590 (M68)...
  • Publication
    The S2N2 metallicity calibrator and the abundance gradient of M33
    We introduce the log(Hα/[SII]λλ6717+6731) versus log(Hα/[NII]λ6583) (S2N2) diagnostic diagram as a metallicity and ionization parameter indicator for HII...