Browsing Research publications by Author "Gear, W.K."

Now showing items 21-33 of 33

    • Multiwavelength observations of the February 1996 high-energy flare in the blazar 3C 279 

      Wehrle, A. E.; Pian, E.; Urry, C.M.; Maraschi, L.; Ghisellini, G.; Hartman, R.C.; Madejski, G. M.; Makino, F.; Marscher, A.P.; McHardy, I.M.; Webb, J. R.; Aldering, G. S.; Aller, M. F.; Aller, H. D.; Backman, D.E.; Balonek, T.J.; Boltwood, P.; Bonnell, J.; Caplinger, J.; Celotti, A.; Collmar, W.; Dalton, J.; Drucker, A.; Falomo, R.; Fichtel, C.E.; Freudling, W.; Gear, W.K.; Gonzalez-Perez, N.; Hall, P.; Inoue, H.; Johnson, W. N.; Kidger, M. R.; Kollgaard, R. I.; Kondo, Y.; Kurfess, J.; Lawson, A.J.; McCollum, B.; McNaron-Brown, K.; Nair, D.; Penton, S.; Pesce, J. E.; Pohl, M.; Raiteri, C.M.; Renda, M.; Robson, E.I.; Sambruna, R.M.; Schirmer, A. F.; Shrader, C.; Sikora, M.; Sillanpää, A.; Smith, P.S.; Stevens, Jason; Stocke, J.; Takalo, L.O.; Teräsranta, H.; Thompson, D.J.; Thompson, R.; Tornikoski, M.; Tosti, G.; Turcotte, P.; Treves, A.; Unwin, S.C.; Valtaoja, E.; Villata, M.; Wagner, S.J.; Xu, W.; Zook, A. C. (American Institute of Physics (AIP), 1997-05-01)
      We report CGRO, RXTE, ASCA, ROSAT, IUE, HST and ground-based observations of a large flare in 3C 279 in February 1996. X-rays and γ-rays peaked simultaneously (within one day). We show simultaneous spectral energy distributions ...

    • On the origin of M81 group extended dust emission 

      Davies, J.I.; Wilson, C. D.; Auld, R.; Baes, M.; Barlow, M.J.; Bendo, G. J.; Bock, J.; Boselli, A.; Bradford, M.; Buat, V.; Castro-Rodriguez, N.; Chanial, P.; Charlot, S.; Ciesla, L.; Clements, D. L.; Cooray, A.; Cormier, D.; Cortese, L.; Dwek, E.; Eales, S.A.; Elbaz, D.; Galametz, M.; Galliano, F.; Gear, W.K.; Glenn, J.; Gomez, H.L.; Griffin, M.; Hony, S.; Isaak, K.G.; Levenson, L.R.; Lu, N.; Madden, S.; O'Halloran, B.; Okumura, K.; Oliver, S.; Page, M. J.; Panuzzo, P.; Papageorgiou, A.; Parkin, T.J.; Perez-Fournon, I.; Pohlen, M.; Rangwala, N.; Rigby, E.; Roussel, H.; Rykala, A.; Sacchi, N.; Sauvage, M.; Schulz, B.; Schirm, M.R.P.; Smith, M. W. L.; Spinoglio, L.; Stevens, Jason; Srinivasan, S.; Symeonidis, M.; Trichas, M.; Vaccari, M.; Vigroux, L.; Wozniak, H.; Wright, G. S.; Zeilinger, W.W. (2010-11-01)
      Galactic cirrus emission at far-infrared wavelengths affects many extragalactic observations. Separating this emission from that associated with extragalactic objects is both important and difficult. In this paper we discuss ...

    • Polarimetric Observations of 15 Active Galactic Nuclei at High Frequencies: Jet Kinematics from Bimonthly Monitoring with the very Long Baseline Array 

      Marscher, A.P.; Jorstad, S.G.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Gear, W.K.; Gomez, J-L.; Stevens, J. A.; Smith, P.S.; Forster, J.R.; Robson, E.I. (2005-10)

    • Polarimetric Observations of 15 AGNs at High Frequencies 

      Jorstad, S.G.; Marscher, A.P.; Stevens, J. A.; Robson, I.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Smith, P.S.; Gomez, J-L.; Gabuzda, D.; Gear, W.K. (Astronomical Society of the Pacific, 2005)
      We have obtained total and polarized intensity images of 15 AGNs with the VLBA at 7 mm at 17 epochs from 25/26 March 1998 to 14 April 2001. The VLBA observations are accompanied at many epochs by simultaneous mea- surements ...

    • The SCUBA Half Degree Extragalactic Survey (SHADES)- II. Submillimetre maps, catalogue and number counts 

      Coppin, Kristen; Chapin, E.; Mortier, A.M.J.; Scott, S.E.; Borys, C.; Dunlop, J.S.; Halpern, M.; Hughes, D.H.; Pope, A.; Scott, D.; Serjeant, S.; Wagg, J.; Alexander, D.M.; Almaini, O.; Aretxaga, L.; Babbedge, T.; Best, P.N.; Blain, A.W.; Clements, D.; Crawford, M.; Dunne, L.; Eales, S.; Edge, A.C.; Farrah, D.; Gaztanaga, E.; Gear, W.K.; Granato, G.L.; Greve, T.R.; Fox, M.; Ivison, R.J.; Jarvis, M.J.; Page, M.J.; Priddey, R.; Stevens, J. A. (2006)

    • The SCUBA Half-Degree Extragalactic Survey (SHADES) - VIII : The Nature of Faint Submillimetre Galaxies in SHADES, SWIRE and SXDF Surveys 

      Clements, D. L.; Vaccari, M.; Babbedge, T.; Oliver, S.; Rowan-Robinson, M.; Davoodi, P.; Ivison, R.; Farrah, D.; Dunlop, J.; Shupe, D.; Waddington, I.; Simpson, C.; Furusawa, H.; Serjeant, S.; Afonso-Luis, A.; Alexander, D.M.; Aretxaga, I.; Blain, A.; Borys, C.; Chapman, S.; Coppin, Kristen; Dunne, L.; Dye, S.; Eales, S. A.; Evans, T.; Fang, F.; Frayer, D.; Fox, M.; Gear, W.K.; Greve, T.R.; Halpern, M.; Hughes, D.H.; Jenness, T.; Lonsdale, C.J.; Mortier, Angela M. J.; Page, M.J.; Pope, A.; Priddey, Robert Stephen; Rawlings, S.; Savage, R.S.; Scott, D.; Scott, S.E.; Sekiguchi, K.; Smail, I.; Smith, H.E.; Stevens, Jason; Surace, J.; Takagi, T.; van Kampen, E. (2008)
      We present the optical-to-submm spectral energy distributions for 33 radio & mid-IR identified submillimetre galaxies discovered via the SHADES 850μm SCUBA imaging in the Subaru-XMM Deep Field (SXDF). Optical data for the ...

    • SCUBA: a common-user submillimetre camera operating on the James Clerk Maxwell Telescope 

      Holland, W.S.; Robson, E.I.; Gear, W.K.; Cunningham, C.; Lightfoot, J.F.; Jenness, T.; Ivison, R.J.; Stevens, J. A.; Ade, P.A.R.; Griffin, M.J.; Duncan, W.D.; Murphy, J.A.; Naylor, D.A. (1999)
      SCUBA, the Submillimetre Common-User Bolometer Array, built by the Royal Observatory Edinburgh for the James Clerk Maxwell Telescope, is the most versatile and powerful of a new generation of submillimetre cameras. It ...

    • Submillimetre galaxies reside in dark matter haloes with masses greater than 3 x 10(11) solar masses 

      Amblard, A.; Cooray, A.; Serra, P.; Altieri, B.; Arumugam, V.; Aussel, H.; Blain, A.; Bock, J.; Boselli, A.; Buat, V.; Castro-Rodriguez, N.; Cava, A.; Chanial, P.; Chapin, E.; Clements, D.; Conley, A.; Conversi, L.; Dowell, C.D.; Dwek, E.; Eales, S.; Elbaz, D.; Farrah, D.; Franceschini, A.; Gear, W.K.; Glenn, J.; Griffin, M.; Halpern, M.; Hatziminaoglou, E.; Ibar, E.; Isaak, K.G.; Ivison, R.J.; Khostovan, A.A.; Lagache, G.; Levenson, L.; Lu, N.; Madden, S.; Maffei, B.; Mainetti, G.; Marchetti, L.; Marsden, G.; Mitchell-Wynne, K.; Nguyen, H.T.; O'Halloran, B.; Oliver, S.; Omont, A.; Page, M.J.; Panuzzo, P.; Papageorgiou, A.; Pearson, C.P.; Perez-Fournon, I.; Pohlen, M.; Rangwala, N.; Roseboom, I.G.; Rowan-Robinson, M.; Portal, M.S.; Schulz, B.; Scott, D.; Seymour, N.; Shupe, D.; Smith, A.J.; Stevens, Jason; Symeonidis, M.; Trichas, M.; Tugwell, K.E.; Vaccari, M.; Valiante, E.; Valtchanov, I.; Vieira, J.; Vigroux, L.; Wang, L.; Ward, R.; Wright, G.; Xu, C.K.; Zemcov, M. (2011)
      The extragalactic background light at far-infrared wavelengths(1-3) comes from optically faint, dusty, star-forming galaxies in the Universe with star formation rates of a few hundred solar masses per year(4). These faint, ...

    • Submillimetre imaging of NGC 3079 

      Stevens, Jason; Gear, W.K. (2000-02-01)
      Submillimetre mapping observations of the active edge-on spiral galaxy NGC 3079 are presented. These maps at 850 and 450 μm were made with the Submillimetre Common User Bolometer Array (SCUBA) at the James Clerk Maxwell ...

    • Submillimetre Polarimetry of Blazars 

      Nartallo, R.; Gear, W.K.; Murray, A.G.; Hobson, E.I.; Hough, J. (Astronomical Society of the Pacific, 1996)
      We report on preliminary results from the first monitoring campaign of the submillimetre polarization of a sample of Blazars. The observations have been carried out with the James Clerk Maxwell Telescope between 1991 and 1994.

    • Variability of the Centimeter-Submillimeter Spectrum and Polarization of 3C 273 during Outburst 

      Stevens, J. A.; Robson, E.I.; Gear, W.K.; Cawthorne, T.V.; Aller, M.; Aller, H.; Terasranta, H.; Wright, M.C.H. (1998)
      Centimeter to submillimeter total flux and polarization monitoring data are used to investigate the nature of a prominent flare in the quasar 3C 273 during 1995/6. After removal of the quiescent level, the resulting “flare ...

    • Variations in the broad-band spectra of BL Lac objects: millimetre observations of an X-ray-selected sample 

      Stevens, J. A.; Gear, W.K. (1999)
      Observations at millimetre wavelengths are presented for a representative sample of 22 X-ray-selected BL Lac objects (XBLs). This sample comprises 19 High-energy cutoff BL Lacs objects (HBLs), 1 Low-energy cutoff BL Lac ...

    • XMM-Newton surveys of the Canada-France Redshift Survey fields - I. The submillimetre/X-ray relation 

      Waskett, T.J.; Eales, S.; Gear, W.K.; Puchnarewicz, E.M.; Lilly, S.; Flores, H.; Webb, T.; Clements, D.; Stevens, J. A.; Thuan, T.X. (2003-06)