Browsing by Author "Axon, D.J."

Now showing items 1-20 of 62

    • The AM Herculis type binary E1405-451 

      Bailey, J.; Axon, D.J.; Hough, J.; Watts, D.J.; Giles, A.B.; Greenhill, J.G. (1983)
      The authors report photometry and polarimetry of the AM Her-type binary E1405-451. For the first time circular polarization has been detected in such an object at wavelengths longer than 1 μm. The light curves and polarization ...

    • 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, ...

    • An atlas of Hubble Space Telescope spectra and images of nearby spiral galaxies 

      Hughes, M.A.; Alonso-Herrero, A.; Axon, D.J.; Scarlata, C.; Atkinson, J.; Batcheldor, D.; Binney, J.; Capetti, A.; Carollo, C.M.; Dressel, L.; Gerssen, J.; Macchetto, F.D.; Maciejewski, W.; Marconi, A.; Merrifield, M.; Ruiz, M.; Sparks, W.; Stiavelli, M.; Tsvetanov, Z.; van der Marel, R. (2003)
      We have observed 54 nearby spiral galaxies with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope to obtain optical long-slit spectra of nuclear gas disks and STIS optical ( R band) images of ...

    • 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 ...

    • 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 ...

    • Coordinated multisite observations of the variability of BL Lac 

      Brindle, C.; Hough, J.; Bailey, J.; Axon, D.J.; Schulz, H.; Kikuchi, S.; McGraw, J.T.; Wisniewski, W.J.; Fontaine, J.; Nadesu, D.; Clayton, G.; Anderson, E.; Jameson, R.F.; Nadesu, D.; Clayton, G.; Anderson, E.; Jameson, R.F.; Smith, R.; Wallis, R.E. (1985)
      The authors present the results of multisite observations of the optical polarization of BL Lac, together with some flux measurements, at a time when BL Lac was relatively faint. The level of polarization varies in a manner ...

    • Detection of a bright ridge in the 2.2 MU-M emission of M82 

      Abolins, J.A.; Adams, D.J.; Jameson, R.F.; Hough, J.; Axon, D.J. (1979)
      Photometric scans through the central region of M82 with a resolution of 6 arcsec reveal that the 2.2-micron emission source has a compact ridge structure which is approximately aligned + or - 10 deg with the major axis ...

    • Discovery of a very red nucleus in the radio elliptical IC5063 (PKS2048 − 57) 

      Axon, D.J.; Bailey, J.; Hough, J. (1982)

    • 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 ...

    • 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 ...

    • High Resolution Studies of Molecular Hydrogen by Means of Near-Infrared Fabry-Perot Imaging 

      Chrysostomou, A.; Burton, M.; Axon, D.J.; Brand, P.W.J.L.; Hough, J.; Bland-Hawthorn, J.; Geballe, T. (Astronomical Society of the Pacific, 1995)
      We present a study of the velocity profiles of the v=1-0 S(1) transition of molecular hydrogen (H2) towards the star forming region of OMC-1. A three dimensional data cube is presented which displays the spatial distribution ...

    • 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 ...

    • Imaging and polarimetry of the galactic-center in the near infrared 

      Bailey, J.; Hough, J.; Axon, D.J. (1984)
      IR images of the Galactic center in H, K, L-prime and M are the bases of the present measurements of positions, magnitudes and colors for 35 sources which can be divided into two classes: those with colors typical of ...

    • Infrared and optical polarimetry of AM Herculis 

      Bailey, J.; Hough, J.; Gilmozzi, R.; Axon, D.J. (1984)
      Circular polarization observations of AM Herculis have been obtained at wavelengths from 0.55 micron (V) to 2.2 micron (K) using a simultaneous three-channel polarimeter. Polarizations of up to 20 per cent were observed ...

    • Infrared and optical polarimetry of the radio elliptic IC-5063 (PKS2048-57) - discovery of a highly polarized nonthermal nucleus 

      Hough, J.; Brindle, C.; Axon, D.J.; Bailey, J.; Sparks, W. (1987)

    • Infrared and optical polarization of Markarian-421 

      Bailey, J.; Cunningham, C.; Hough, J.; Axon, D.J. (1981)
      Observations of the polarization of Mrk 421 in the V, J, and K bands are presented. The infrared radiation shows variable polarization with a range of at least 2-4%. The spectrum of the nonthermal source in the VJK regions ...

    • Infrared photometry of the nuclei of early-type radio galaxies 

      Sparks, W.; Hough, J.; Axon, D.J.; Bailey, J. (1986)
      The authors have obtained near- and mid-infrared photometry of the nuclei of both strong and weak radio galaxies. The implication of these data are that a relatively small percentage, ≅15 per cent, of radio ellipticals ...

    • Infrared polarimetry of the nucleus of Centaurus A - The nearest blazar? 

      Bailey, J.; Sparks, W.; Hough, J.; Axon, D.J. (1986)
      As one of the nearest examples of an active galaxy, NGC5128 (Centaurus A) has been studied in detail over a wide range of wavelengths. The nucleus of the galaxy is seen clearly in the X-ray, radio and infrared, but is ...

    • Infrared polarization in OMC-1 - Discovery of a molecular hydrogen reflection nebula 

      Hough, J.; Axon, D.J.; Burton, M.; Gatley, I.; Sato, S.; Bailey, J.; McCaughrean, M.J.; McLean, I.; Nagata, T.; Allen, D.; Garden, R.; Hasegawa, T.; Hayashi, M.; Kaifu, N.; Morimoto, M.; Walther, D. (1986)
      The polarization of the broadband continuum at K has been mapped in the core of the OMC-1 with high spatial resolution, and with lower resolution in a more extensive surrounding area. In addition, the first detailed ...