Browsing by Author "Gledhill, T."

Now showing items 1-20 of 53

    • ALMA reveals the coherence of the magnetic field geometry in OH 231.8+4.2 

      Sabin, L.; Sahai, R.; Vlemmings, W. H. T.; Zhang, Q.; Zijlstra, A. A.; Gledhill, T.; Huarte-Espinosa, M.; Sánchez, A. F. Pérez; Lagadec, E.; Navarro, S. G. (2020-05-23)
      In a continuing effort to investigate the role of magnetic fields in evolved low and intermediate mass stars (principally regarding the shaping of their envelopes), we present new ALMA high resolution polarization data ...

    • Astrobiological signatures: prospects for the detection of non-terrestrial biological material 

      Gledhill, T.; Sparks, W.; Ulanowski, Z.; Hough, J.; DasSarma, S. (2007)
      The possibilities for detecting non-terrestrial biological material are briefly reviewed in light of the flurry of extrasolar planet detections over the last ten years and the forthcoming space missions designed to search ...

    • Axisymmetry in protoplanetary nebulae - II : A near-infrared imaging polarimetric survey 

      Gledhill, T. (2005)
      In an imaging polarimetry survey of candidate post-AGB stars, scattering envelopes are detected around 20 objects. These envelopes represent the final mass-loss phases at the end of the AGB. In all cases, evidence for ...

    • Axisymmetry in protoplanetary nebulae: using imaging polarimetry to investigate envelope structure 

      Gledhill, T.; Chrysostomou, A.; Hough, J.; Yates, J.A. (2001-04)
      We use ground-based imaging polarimetry to detect and image the dusty circumstellar envelopes of a sample of proto-planetary nebulae (PPNe) at near-infrared wavelengths. This technique allows the scattered light from the ...

    • Circular polarisation in star-forming regions : possible implications for homochirality 

      Hough, J.; Bailey, J.; Chrysostomou, A.; Gledhill, T.; Lucas, P.W.; Tamura, M.; Clark, S.; Yates, J.A.; Menard, F. (2001)

    • Circular Polarization in Star- Formation Regions : Implications for Biomolecular Homochirality 

      Bailey, J.; Chrysostomou, A.; Hough, J.; Gledhill, T.; McCall, A.; Clark, S.; Menard, F.; Tamura, M. (1998)
      Strong infrared circular polarization resulting from dust scattering in reflection nebulae in the Orion OMC-1 star-formation region has been observed. Circular polarization at shorter wavelengths might have been important ...

    • Circumbinary Disks around T Tauri Stars: HST/NICMOS Near-Infrared Images and Polarimetric Maps 

      Duchene, G.; Silber, J.; Menard, F.; Gledhill, T. (Astronomical Society of the Pacific, 2000)
      We have obtained new near-infrared images of both GG Tau and UY Aur circumbinary disks with the polarimetric modes of NICMOS aboard the Hubble Space Telescope.

    • Circumstellar structure of RU Lupi down to au scales 

      Takami, M.; Bailey, J.; Gledhill, T.; Chrysostomou, A.; Hough, J. (2001-05)

    • The compact circumstellar material around OH 231.8+4.2 

      Matsuura, M.; Chesneau, O.; Zijlstra, A.A.; Jaffe, W.; Waters, L.B.F.M.; Yates, J.A.; Lagadec, E.; Gledhill, T.; Etoka, S.; Richards, A.M.S. (2006)

    • The Coordinated Radio and Infrared Survey for High-Mass Star Formation (The CORNISH Survey). I : Survey Design 

      Hoare, M.G.; Purcell, C.R.; Churchwell, E.B.; Diamond, P.; Cotton, W.D.; Chandler, C.J.; Smethurst, S.; Kurtz, S.E.; Mundy, L.G.; Dougherty, S.M.; Fender, R.P.; Fuller, G.A.; Jackson, J.M.; Garrington, S.T.; Gledhill, T.; Goldsmith, P.F.; Lumsden, S.L.; Martí, J.; Moore, T.J.T.; Muxlow, T.W.B.; Oudmaijer, R.D.; Pandian, J.D.; Paredes, J.M.; Shepherd, D.S.; Spencer, R.E.; Thompson, M.A.; Umana, G.; Urquhart, J.S.; Zijlstra, A.A. (2012-09-01)
      We describe the motivation, design, and implementation of the CORNISH survey, an arcsecond-resolution radio continuum survey of the inner galactic plane at 5 GHz using the Very Large Array (VLA). It is a blind survey ...

    • The Coordinated Radio and Infrared Survey for High-mass Star Formation II : Source Catalog 

      Purcell, C.R.; Hoare, M.G.; Cotton, W.D.; Lumsden, S. L.; Urquhart, J.S.; Chandler, C.; Churchwell, E.B.; Diamond, P.; Dougherty, S.M.; Fender, R.P.; Fuller, G.; Garrington, S.T.; Gledhill, T.; Goldsmith, P.F.; Hindson, L.; Jackson, J.M.; Kurtz, S.E.; Martí, J.; Moore, T.J.T.; Mundy, L.G.; Muxlow, T.W.B.; Oudmaijer, R.D.; Pandian, J.D.; Paredes, J.M.; Shepherd, D.S.; Smethurst, S.; Spencer, R.E.; Thompson, M.A.; Umana, G.; Zijlstra, A.A. (2013-03-01)
      The CORNISH project is the highest resolution radio continuum survey of the Galactic plane to date. It is the 5 GHz radio continuum part of a series of multi-wavelength surveys that focus on the northern GLIMPSE region ...

    • Detection of a Massive Dust Shell around the Type II Supernova SN 2002hh 

      Barlow, M.J.; Sugerman, B.E.K.; Fabbri, J.; Meixner, M.; Fisher, R.S.; Bowey, J.; Panagia, N.; Ercolano, B.; Clayton, G.; Cohen, M.; Gledhill, T.; Gordon, K.; Tielens, A.G.G.M.; Zijlstra, A.A. (2005)

    • The disappearance of the 1667-MHz OH maser in IRAS 17436+5003 (HD 161796) 

      Bains, I.; Yates, J.A.; Gledhill, T.; Richards, A.M.S. (2003)
      We report the diminution of the 1667-MHz OH maser in the post-asymptotic giant branch star IRAS 17436+5003, by a factor of ≳17 over a period of ≲12 yr, from observations with MERLIN. This circumstellar maser was detected ...

    • Discovery of shocked H-2 around OH 231.8+4.2 

      Forde, K.P.; Gledhill, T. (2012-03)
      We present K-band integral field observations of the circumstellar envelope of the evolved star OH 231.8+4.2. Spatial and spectral information was simultaneously acquired using the SINFONI integral field unit, with adaptive ...

    • Dust polarized emission observations of NGC 6334 : BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network 

      BISTRO; Arzoumanian, D.; Furuya, R.; Hasegawa, T.; Tahani, M.; Sadavoy, S.; Hull, C. L. H.; Johnstone, D.; Koch, P. M.; Inutsuka, S. -i.; Doi, Y.; Hoang, T.; Onaka, T.; Iwasaki, K.; Shimajiri, Y.; Inoue, T.; Peretto, N.; André, P.; Bastien, P.; Berry, D.; Chen, H. -R. V.; Francesco, J. Di; Eswaraiah, C.; Fanciullo, L.; Fissel, L. M.; Hwang, J.; Kang, J. -h.; Kim, G.; Kim, K. -T.; Kirchschlager, F.; Kwon, W.; Liu, H. -L.; Lyo, A. -R.; Pattle, K.; Soam, A.; Tang, X.; Whitworth, A.; Ching, T. -C.; Coudé, S.; Ward-Thompson, D.; Lai, S. -P.; Qiu, K.; Bourke, T. L.; Byun, D. -Y.; Chen, M.; Chen, Z.; Cho, J.; Choi, Y.; Chrysostomou, A.; Gledhill, T.; Parsons, H. (2021-03-11)
      Context. Molecular filaments and hubs have received special attention recently thanks to new studies showing their key role in star formation. While the (column) density and velocity structures of both filaments and hubs ...

    • Ejecta and the Late Stages of Stellar Evolution 

      Gledhill, T. (Astronomical Society of the Pacific, 2005)
      The late stages of stellar evolution are characterised by prodigious mass-loss, particularly on the Asymptotic Giant Branch (AGB), resulting in the build up of a circumstellar envelope of gas and dust. In this way, the ...

    • Extended H2 emission line sources from UWISH2 

      Froebrich, D.; Makin, S. V.; Davis, C.J.; Gledhill, T.; Kim, Y.; Koo, B. -C.; Rowles, J.; Eislöffel, J.; Nicholas, J.; Lee, J. J.; Williamson, J.; Buckner, A. S. M. (2015-12-11)
      We present the extended source catalogue for the UKIRT Wide Field Infrared Survey for H2 (UWISH2). The survey is unbiased along the inner Galactic Plane from l≈357deg to l≈65deg and |b| ≤ 1 ∘.5 and covers 209 deg2. A further ...

    • A fast bipolar H2 outflow from IRAS 16342-3814 : An old star reliving its youth 

      Gledhill, T.; Forde, K.P. (2012-03)
      Some evolved stars in the pre-planetary nebula phase produce highly collimated molecular outflows that resemble the accretion-driven jets and outflows from pre-main-sequence stars. We show that IRAS 16342-3814 (the Water ...

    • He i 1.083 um Emission and Absorption in DG Tauri: Line Excitations in the Jet, Hot Wind, and Accretion Flow 

      Takami, M.; Chrysostomou, A.; Bailey, J.; Gledhill, T.; Tamura, M.; Terada, H. (2002-03)

    • High Circular Polarization in the Star Forming Region NGC 6334: Implications 

      Menard, F.; Chrysostomou, A.; Gledhill, T.; Hough, J.; Bailey, J. (Astronomical Society of the Pacific, 2000)
      The amino-acids which form the building blocks of biological proteins are all left-handed molecules. By contrast, when these molecules are made in the laboratory equal numbers of the right and left-handed versions are made. ...