Browsing by Title

Now showing items 16926-16945 of 24054

    • Polarimetry and modelling of narrow-line active galaxies 

      Young, S.; Hough, J.; Efstathiou, A.; Wills, B.; Bailey, J.; Axon, D.J. (1996)
      We present optical spectropolarimetry along with optical and infrared broad-band filter polarimetry of selected warm [f(25 μm)/f(60 μm)>=0.3] IRAS galaxies and other known Seyfert 2 galaxies. Broad lines in polarized flux ...

    • Polarimetry and photometry of the new AM Herculis system RE J1844-741 

      Bailey, J.; Ferrario, L.; Wickramasinghe, D.T.; Buckley, D.A.H.; Hough, J. (1995)
      The ROSAT Wide Field Camera extreme-ultraviolet (EUV) source RE J1844-741 was identified with a 16th-magnitude cataclysmic variable with a period of 90 min by O'Donoghue et al. In this paper, we present spectropolarimetry ...

    • Polarimetry and the torus 

      Hough, J.; Young, S.; Efstathiou, A. (1996)
      While the torus plays an obvious role in blocking direct light, and thus increasing the observed polarization from scattering, its role in directly producing polarized flux is less clear. Contributions to the infrared ...

    • Polarimetry at UKIRT 

      Hough, J.H. (Springer Nature, 2013)
      Polarimetry has played an important role at UKIRT, both through visitor instruments and as an option on most facility instruments. A large range of science has been carried out covering galactic and extragalactic astronomy. ...

    • Polarimetry developments at the Gemini telescopes 

      Hough, J.; Aitken, D. (2003)

    • Polarimetry for the Gemini telescopes 

      Hough, J.; Aitken, D.; Chrysostomou, A. (1998)
      Polarimeters at optical and near-IR wavelengths are increasingly available as part of facility instruments at major observatories, and are used for a large number of astronomical programs, ranging form nearby star-forming ...

    • Polarimetry for the Gemini telescopes 

      Hough, J.; Aitken, D.; Chrysostomou, A. (Int Soc for Optical Engineering, 1998)
      Polarimeters at optical and near-IR wavelengths are increasingly available as part of facility instruments at major observatories, and are used for a large number of astronomical programs, ranging form nearby star-forming ...

    • Polarimetry in the infrared : what can be learned? 

      Hough, J.; Aitken, D. (2003)

    • Polarimetry of External Galaxies 

      Hough, J. (Astronomical Society of the Pacific, 1996)
      This review presents results to date on the wavelength dependence of interstellar polarization (ISP) in other galaxies. A number of different techniques are discussed, and galaxy types range from those similar to the Milky ...

    • Polarimetry of ST LMi - Discovery of a second accreting pole 

      Peacock, T.; Cropper, M.; Bailey, J.; Hough, J.; Wickramasinghe, D.T. (1992)
      We have obtained simultaneous multiband photometric and polarimetric light curves for ST LMi (CW1103 + 254) in the visible range and the near-infrared on three occasions. These clearly show the presence of previously ...

    • Polarimetry of Stars and Planetary Systems 

      Kolokolova, L.; Hough, J.H.; Levasseur-Regourd, A.-C.; School of Physics, Astronomy and Mathematics; Science & Technology Research Institute; Centre for Astrophysics Research (Cambridge University Press, 2015-05-14)

    • Polarimetry of young stellar objects - III : Circular polarimetry of OMC-1 

      Chrysostomou, A.; Gledhill, T.M.; Ménard, F.; Hough, J.H.; Tamura, M.; Bailey, J. (2000-02-11)
      We present the first imaging circular polarimetry of the Orion Molecular Cloud, OMC-1. The observations, taken in the J, H, K and nbL bands, reveal a complex pattern of circular polarization. Globally, there is a background ...

    • Polarimetry research at the University of Florida 

      Packham, C.; Hough, J.; Kolokolova, L.; Telesco, C.M. (2004)
      The advent of large ( or larger) telescopes along with the new breed of mid-IR instrumentation opens a new window to diffraction-limited investigations of the nature of faint or crowded field astronomical objects at mid-IR ...

    • Polarimetry Techniques at Optical and Infrared Wavelengths 

      Hough, J. (Astronomical Society of the Pacific, 2005)
      The techniques and components used to measure both linear and circular polarization at wavelengths from 0.3 ¹m to 20 ¹m are reviewed. Some emphasis is given to the implementation of polarimetry on the latest generation of ...

    • The polarisation of HD 189733 

      Bott, Kimberly; Bailey, Jeremy; Kedziora-Chudczer, Lucyna; Cotton, Daniel V.; Lucas, P. W.; Marshall, Jonathan P.; Hough, J. H. (2016-06-11)
      We present linear polarization observations of the exoplanet system HD 189733 made with the HIgh Precision Polarimetric Instrument (HIPPI) on the Anglo-Australian Telescope (AAT). The observations have higher precision ...

    • The polarization and magnetic field of REJ1938-461 during its low state 

      Ferrario, L.; Wickramasinghe, D.T.; Bailey, J.; Buckley, D.A.H.; Hough, J. (1994)

    • Polarization Diagnostics for Cool Core Cluster Emission Lines 

      Sparks, W.B.; Pringle, J. E.; Carswell, R. F.; Voit, G.M.; Donahue, M.; Cracraft, M.; Meyer, E.T.; Hough, J.H.; Manset, N. (2014-01-01)
      The nature of the interaction between low-excitation gas filaments at ~104 K, seen in optical line emission, and diffuse X-ray emitting coronal gas at ~107 K in the centers of galaxy clusters remains a puzzle. The presence ...

    • Polarization due to dichroic absorption and emission by aligned grains in dusty discs 

      Efstathiou, A.; McCall, A.; Hough, J. (1997)
      We present a method for calculating the infrared polarization due to absorption and emission by aligned grains distributed in a disc or a torus. The temperature distribution in the torus is calculated with the axially ...

    • Polarization due to rotational distortion in the bright star Regulus 

      Cotton, Daniel V.; Bailey, Jeremy A.; Howarth, Ian D.; Bott, Kimberly; Kedziora-Chudczer, Lucyna; Lucas, P. W.; Hough, J. H. (2018-10-01)
      Polarization in stars was first predicted by Chandrasekhar [1] who calculated a substantial linear polarization at the stellar limb for a pure electron-scattering atmosphere. This polarization will average to zero when ...

    • A Polarization Flare in 3C 273: A Clue to Jet Physics 

      Cross, L.L.; Wills, B.; Hough, J.; Bailey, J. (Astronomical Society of the Pacific, 2001)
      We present UBVRIJHK polarization and flux density observations of the quasar 3C 273 obtained during a time of outburst over two weeks in 1988 February. We have modelled these data with two power law components, each with ...