Browsing by Title

Now showing items 16981-17000 of 24106

    • 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 ...

    • Polarization of galactic-center at 2.2 micron 

      Adams, D.J.; Hough, J. (1977)

    • Polarization of hot Jupiter systems: a likely detection of stellar activity and a possible detection of planetary polarization 

      Bailey, Jeremy; Bott, Kimberly; Cotton, Daniel V.; Kedziora-Chudczer, Lucyna; Zhao, Jinglin; Evensberget, Dag; Marshall, Jonathan P.; Wright, Duncan; Lucas, P. W. (2021-04-01)
      We present high-precision linear polarization observations of four bright hot Jupiter systems ($\tau$ Boo, HD 179949, HD 189733 and 51 Peg) and use the data to search for polarized reflected light from the planets. The ...

    • The polarization of NGC 1068 

      Bailey, J.; Axon, D.J.; Hough, J.; Ward, M.J.; McLean, I.; Heathcote, S.R. (1988)
      Broad-band polarimetry of NGC 1068 over the wavelength range 0.36 - 4.8 μm is presented, together with high-resolution spectropolarimetry of the Hβ, [O III] and Hα, [N II] regions of the spectrum. The authors recognize ...

    • Polarization Properties of Active Galactic Nuclei 

      Hough, J. (Astronomical Society of the Pacific, 1997)
      One of the main uses of polarimetry over the last decade has been to identify the nature of AGN that are normally hidden from direct view by an optically and geometrically thick torus, and thereby to unify different classes ...

    • Polarized broad HeI and Paschen lines in NGC 1068 

      Alexander, D.M.; Young, S.; Hough, J. (1999)
      We present J-band spectropolarimetry of NGC 1068. We observe polarized broad Pa β and, for the first time, polarized broad Pa γ and HeI. Assuming electron scattering as the polarization mechanism, the polarized broad lines ...

    • Polarized optical scattering signatures from biological materials 

      Martin, William Eugene; Hesse, E.; Hough, J.H.; Sparks, W.B.; Cockell, C.S.; Ulanowski, Z.; Germer, T.A.; Kaye, Paul H. (2010-11)
      The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350-850. nm. Incident circular, linearly polarized, and unpolarized light produces significant spectral ...

    • Polarized point sources in the LOFAR Two-meter Sky Survey: A preliminary catalog 

      Eck, C. L. Van; Haverkorn, M.; Alves, M. I. R.; Beck, R.; Best, P.; Carretti, E.; Chyży, K. T.; Farnes, J. S.; Ferrière, K.; Hardcastle, M. J.; Heald, G.; Horellou, C.; Iacobelli, M.; Jelić, V.; Mulcahy, D. D.; O'Sullivan, S. P.; Polderman, I. M.; Reich, W.; Riseley, C. J.; Röttgering, H.; Schnitzeler, D. H. F. M.; Shimwell, T. W.; Vacca, V.; Vink, J.; White, G. J. (2018-06-01)
      The polarization properties of radio sources at very low frequencies (<200 MHz) have not been widely measured, but the new generation of low-frequency radio telescopes, including the Low Frequency Array (LOFAR: a Square ...