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Now showing items 11347-11366 of 24064

    • Infrared Mn I laboratory oscillator strengths for the study of late type stars and ultracool dwarfs 

      Blackwell-Whitehead, R.; Pavlenko, Y. V.; Nave, G.; Pickering, J.C.; Jones, H.R.A.; Lyubchik, Y.; Nilsson, H. (2011)
      Aims: The aim of our new laboratory measurements is to measure accurate absolute oscillator strengths for neutral manganese transitions in the infrared needed for the study of late-type stars and ultracool dwarfs. Methods: ...

    • Infrared Observations of a Mid-L Dwarf with Strong Hα Emission 

      Riaz, Basmah; Gizis, John E. (2007-04-10)
      We present Spitzer/IRAC observations of the L5 dwarf, 2MASSI J1315309-264951 (2M 1315). This ultracool dwarf is known to display strong emission in the H alpha line. The spectral energy distribution (SED) for this object ...

    • Infrared Photometry of Blazars - 8 Years of Observations 

      Litchfield, S.~J.; Robson, E.~I.; Stevens, Jason (1994-09-01)
      We present photometric observations of 16 blazar sources at mid- to near- infrared wavelengths, covering the period 1986 January to 1993 December. We present the data in tabular form and, for selected well-sampled sources, ...

    • 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 and Integral Field Spectroscopy of Post-Asymptotic Giant Branch Stars 

      Lowe, K. (2008-10-20)
      In this thesis, I present the properties of IRAS 19306+1407 central source and its sur- rounding circumstellar envelope (CSE), from the analysis of near-infrared (near-IR) polarimetry and integral field spectroscopy ...

    • Infrared Polarimetry and the Torus 

      Hough, J. (1997)
      Polarimetry at near-infrared wavelengths is shown to be an important tool in understanding the properties of the obscuring torus in NGC1068. We present evidence for the existence of aligned grains in the torus, which produce ...

    • Infrared polarimetry of dark clouds. II : Magnetic field structure in the Rho Ophiuchi dark cloud 

      Sato, S.; Tamura, M.; Nagata, T.; Kaifu, N.; Hough, J.; McLean, I. (1988)
      K-band polarimetry of 20 sources embedded within the densest region of the Rho Oph dark cloud has been obtained. The degree of polarization ranges from 1.1 to 7.4 percent, and the position angles have a bimodal distribution, ...

    • Infrared Polarimetry of Interstellar Dust 

      Hough, J.; Aitken, D. (2005)
      Grains in the diffuse interstellar medium, and in at least some parts of dense molecular clouds, are aligned with their short axis preferentially along the direction of the local magnetic field. At longer infrared wavelengths ...

    • 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 polarimetry of the reflection nebula near L 1551 IRS 5 

      Nagata, T.; Yamashita, T.; Sato, S.; Suzuki, H.; Hough, J.; Garden, R.; Gatley, I. (1986)
      The K-band polarization has been measured in the region extending 30 arcsec to the SW of L 1551 IRS 5. The degree of polarization is exceptionally high, reaching ≡67 per cent. The large polarizations and the azimuthal ...

    • Infrared polarimetry of the southern massive star-forming region G333.6-0.2 

      Fujiyoshi, T.; Smith, C.H.; Wright, C.M.; Moore, T.J.T.; Aitken, D.; Roche, P.F. (2001)
      We present 8-13μm spectropolarimetry, and 12- and 2-μm imaging polarimetry of the southern massive star-forming region G333.6−0.2. Spectro-polarimetry measurements show that the polarization observed towards the nebula ...

    • 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 ...

    • The infrared properties of sources matched in the WISE all-sky and Herschel ATLAS surveys 

      Bond, Nicholas A.; Benford, Dominic J.; Gardner, Jonathan P.; Amblard, Alexandre; Fleuren, Simone; Blain, Andrew W.; Dunne, Loretta; Smith, Daniel; Maddox, Steve J.; Hoyos, Carlos; Baes, Maarten; Bonfield, David; Bourne, Nathan; Bridge, Carrie; Buttiglione, Sara; Cava, Antonio; Clements, David; Cooray, Asantha; Dariush, Ali; de Zotti, Gianfranco; Driver, Simon; Dye, Simon; Eales, Steve; Eisenhardt, Peter; Hopwood, Rosalind; Ibar, Edo; Ivison, Rob J.; Jarvis, M.J.; Kelvin, Lee; Robotham, Aaron S. G.; Temi, Pasquale; Thompson, Mark; Tsai, Chao-Wei; van der Werf, Paul; Wright, Edward L.; Wu, Jingwen; Yan, Lin (2012-05-01)
      We describe the infrared properties of sources detected over similar to 36 deg(2) of sky in the GAMA 15 hr equatorial field, using data from both the Herschel Astrophysical Terahertz Large-Area Survey (H-ATLAS) and Wide-field ...

    • Infrared reflection nebula in W75N 

      Yamashita, T.; Sato, S.; Tamura, M.; Suzuki, H.; Gatley, I.; Hough, J.; Mountain, C.M.; Moore, T.J.T. (1988)
      A new infrared reflection nebula is identified in the W75N region. The K-band polarization map shows a centrosymmetric pattern of the vectors extending over a region 2 arcmin in size, with large values of degrees of ...

    • An infrared ring around the magnetar SGR 1900+14 

      Wachter, S.; Ramirez-Ruiz, E.; Dwarkadas, V.V.; Kouveliotou, C.; Granot, J.; Patel, S.K.; Figer, D. (2008)

    • An Infrared Spectral Sequence for M Dwarfs 

      Jones, H.R.A.; Longmore, A.J.; Jameson, R.F. (Astronomical Society of the Pacific, 1994)
      We present a spectral sequence from 1-2.5 um of M dwarfs from GL411 which is classified as M2V to the best brown dwarf candidate GD165B (M10V). This sequence shows the progressive importance of water vapour in the stmospheres ...

    • Infrared spectropolarimetric observations of BNKL : the grain alignment mechanism 

      Aitken, D.; Bailey, J.; Roche, P.F.; Hough, J. (1985)
      Spectropolarimetric observations between 8 - 13 μm of BN, IRc 2, 3, 4 and a further region in the Orion infrared complex BNKL are presented. Apart from IRc 2, all show evidence for absorption by aligned grains and have ...

    • Infrared spectropolarimetry of AFGL 2591 - Evidence for an annealed grain component 

      Aitken, D.; Roche, P.F.; Smith, C.H.; James, S.D.; Hough, J. (1988)

    • Infrared spectropolarimetry of Seyfert galaxy NGC1068 

      Aitken, D.; Bailey, J.; Briggs, G.; Hough, J.; Roche, P.F. (1984)
      Although most of the luminosity of Seyfert galaxy nuclei is emitted in the IR, the relative amounts of thermal dust and non-thermal emission are uncertain. Seyfert galaxies generally have smooth and featureless IR spectra, ...

    • Infrared spectropolarimetry of the galactic-center-magnetic alignment in the discrete sources 

      Aitken, D.; Roche, P.F.; Bailey, J.; Briggs, J.P.; Hough, J.; Thomas, J.A. (1986)
      The results of 8-13 micron spectropolarimetric observations of Galactic Center sources are presented. All the sources show interstellar polarization due to absorption by aligned silicate grains, and these grains appear to ...