Browsing by Author "Young, S."

Now showing items 1-20 of 39

    • The appearance of broad H alpha in BL Lacertae 

      Corbett, E.A.; Robinson, A.; Axon, D.J.; Hough, J.; Jeffries, R.D.; Thurston, M.R.; Young, S. (1996)
      We present optical spectropolarimetry confirming Vermeulen et al.'s recent discovery of a broad Hα emission line in BL Lacertae. This feature, which is present at about the same strength in spectra taken two days apart, ...

    • Beaming in Radio-Quiet AGN 

      Young, S.; Hough, J.; Axon, D.J.; Bailey, J. (Astronomical Society of the Pacific, 1997)
      We have obtained new optical spectropolarimetric data for the radio-quiet Seyfert NGC 1068, taken through apertures on the nucleus and at two positions within the ionization/scattering cone. The equivalent width of scattered ...

    • Constraints on the nuclear emission of the Circinus galaxy : optical and near-IR spectropolarimetry 

      Alexander, D.M.; Heisler, C.A.; Young, S.; Lumsden, C.L.; Hough, J.; Bailey, J. (2000)
      We present optical and, for the first time, K-band spectropolarimetry of the nuclear region of the Circinus galaxy. In the optical we confirm the previous discovery of polarized broad Hα. We have not detected polarized ...

    • The contribution from scattered light to quasar galaxy hosts 

      Young, S.; Axon, D.J.; Robinson, A.; Capetti, A. (2009)
      We present models representing the scattering of quasar radiation off free electrons and dust grains in geometries that approximate the structure of quasar host galaxies. We show that, for reasonable assumptions, scattering ...

    • Equatorial scattering and the structure of the broad-line region in Seyfert nuclei: evidence for a rotating disc 

      Smith, J.E.; Robinson, A.; Young, S.; Axon, D.J.; Corbett, E.A. (2005)
      We present detailed scattering models confirming that distinctive variations in polarization across the broad Hα line, which are observed in a significant fraction of type 1 Seyfert galaxies, can be understood in terms of ...

    • Evidence for an Obscured Broadline Region in the Early Type Radio Galaxy IC5063 

      Inglis, M.D.; Brindle, C.; Hough, J.; Young, S.; Axon, D.J.; Bailey, J.; Ward, M.J. (1993)
      We report the detection of strong, broad Hα emission seen in polarized flux from the early-type radio galaxy IC 5063. This suggests that the galaxy has a broad-line region which is obscured from our direct view, with the ...

    • Gemini mid-IR polarimetry of NGC1068: polarized structures around the nucleus 

      Packham, C.; Young, S.; Fisher, R.S.; Volk, K.; Mason, R.E.; Hough, J.; Roche, P.F.; Elitzur, M.; Radomski, J.; Perlman, E. (2007)

    • Hidden broad-line regions and anisotropy in AGN 

      Axon, D.J.; Hough, J.; Young, S.; Inglis, M.D. (1994)
      We discuss the recent advances made in the search for hidden broad line regions in Seyfert and Narrow Line Radio Galaxies (NLRG) using both spectropolarimetry and infrared spectroscopy/spectropolarimetry. Two important ...

    • Highly polarized structures in the near-nuclear regions of Cygnus A: intrinsic anisotropy within the cones 

      Tadhunter, C.N.; Sparks, W.; Axon, D.J.; Bergeron, L.; Jackson, N.; Packham, C.; Hough, J.; Robinson, A.; Young, S. (2000)
      We present near-IR imaging polarimetry observations of the nucleus of Cygnus A, taken with the NICMOS camera of the HST at a wavelength of 2.0μm. These maps reveal a highly collimated region of polarized emission straddling ...

    • A model for the infrared continuum spectrum of NGC 1068 

      Efstathiou, A.; Hough, J.; Young, S. (1995)
      We present a model for the nuclear infrared (IR) continuum spectrum of the Seyfert galaxy NGC 1068. The torus emission is modelled in terms of the tapered disc models of Efstathiou & Rowan-Robinson, which give a good fit ...

    • A Model for the Infrared Polarization of NGC 1068 

      Efstathiou, A.; Hough, J.; McCall, A.; Young, S. (Astronomical Society of the Pacific, 1996)
      We present a method for calculating the polarization due to absorption and emission by aligned grains distributed in a disk or a torus. The temperature distribution in the torus is calculated self-consistently with the ...

    • Near-infrared and millimetre polarimetry of CEN A 

      Packham, C.; Hough, J.; Young, S.; Chrysostomou, A.; Bailey, J.; Axon, D.J.; Ward, M.J. (1996)
      We present near-infrared polarization images of the nuclear region of CenA, and millimetre polarimetry of the nucleus. In the near-infrared the polarization vectors mainly lie along the dust lane, with the polarization ...

    • Near-infrared imaging polarimetry and modelling of NGC 4151 

      Ruiz, M.; Packham, C.; Alexander, D.M.; Hough, J.; Young, S. (2003)

    • Near-infrared imaging polarimetry of Cygnus A 

      Packham, C.; Young, S.; Hough, J.; Tadhunter, C.N.; Axon, D.J. (1998)
      We present a 2.2-μm polarization image of the nuclear regions of Cygnus A. The degree of polarization in the central 1 arcsec is (4.1±0.50) per cent, at a position angle of (23.6±3.6)°, approximately perpendicular to the ...

    • Near-infrared imaging polarimetry of NGC 1068 

      Packham, C.; Young, S.; Hough, J.; Axon, D.J.; Bailey, J. (1997)
      We present near-infrared polarization images of the nuclear region of NGC 1068. For the first time, extended reflection nebulosity from the south-western cone, which is obscured at optical wavelengths, is detected. Polarized ...

    • A near-infrared polarized bipolar cone in the Circinus galaxy 

      Ruiz, M.; Alexander, D.M.; Young, S.; Hough, J.; Lumsden, S.; Heisler, C.A. (2000)
      We present near–infrared broad–band polarization images of the nuclear regions of the Circinus galaxy in the J, H and K bands. For the first time the south–eastern reflection cone is detected in polarized light, which is ...

    • Near-IR spectropolarimetry and modeling of NGC 1068 

      Young, S.; Hough, J.; Axon, D.J.; Bailey, J.; Ward, M.J. (1995)
      We present new spectropolarimetric data for NGC 1068, including, for the first time, coverage in the near-IR. Using these, and other previously published data, we develop a scattering model for NGC 1068, using NGC 5548 for ...

    • Near-IR Spectropolarimetry of NGC 1088 

      Young, S.; Hough, J.; Bailey, J.; Axon, D.J.; Ward, M.J. (Astronomical Society of the Pacific, 1994)
      The current unified model of Seyfert galaxies, as proposed by Antonucci and Miller (1985), has most, if not all, Seyfert 2 galaxies hosting a Seyfert 1 type nucleus in their cores. The broad lines from the type 1 nucleus ...

    • Neuropsychological characteristics of adults with comorbid ADHD and borderline/mild intellectual disability 

      Rose, E.; Bramham, J.; Young, S.; Paliokostas, E.; Xenitidis, K. (2009)
      This study aimed to characterise the neuropsychological functioning of adults with comorbid attention deficit hyperactivity disorder (ADHD) and intellectual disability. Individuals with ADHD and mild-borderline range ...

    • Nicmos polarimetry of "polar-scattered" seyfert 1 galaxies 

      Batcheldor, D.; Robinson, A.; Axon, D. J.; Young, S.; Quinn, S.; Smith, J. E.; Hough, J.; Alexander, D. M. (2011-09-01)
      The nuclei of Seyfert 1 galaxies exhibit a range of optical polarization characteristics that can be understood in terms of two scattering regions producing orthogonal polarizations: an extended polar scattering region ...