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

Now showing items 1-20 of 33

    • A Comparison of the Centimetre-to-Submillimetre Continuum Spectra of BL Lacertae 

      Stevens, Jason; Litchfield, S.J.; Robson, E.I.; Gear, W.K.; Hughes, D.H. (Kluwer, 1994)

    • A Comparison of the Radio / Submillimetre Spectra of Bl-Lacertae Objects and Flat Spectrum Radio Quasars 

      Gear, W.K.; Stevens, Jason; Hughes, D.H.; Litchfield, S.J.; Robson, E.I.; Terasranta, H.; Valtaoja, E.; Steppe, H.; Aller, M. F.; Aller, H. D. (1994-03-01)
      We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are ...

    • Detection of Gamma Rays with E > 100 MeV from BL Lacertae 

      Catanese, M.; Akerlof, C.; Biller, S.D.; Boyle, P.; Buckley, J.H.; Carter-Lewis, D.A.; Cawley, M.F.; Connaughton, V.; Dingus, B.; Fegan, D.J.; Fichtel, C.E.; Finley, J.P.; Gaidos, J.A.; Gear, W.K.; Hartman, R.C.; Hillas, A.M.; Krennrich, F.; Lamb, R.C.; Lessard, R.W.; Lin, Y.C.; McEnery, J.E.; Marscher, A.P.; Mohanty, G.; Mukherjee, R.; Quinn, J.; Robson, E.I.; Rodgers, A.J.; Rose, H.J.; Samuelson, F.W.; Sembroski, G.; Schubnell, M.S.; Stevens, J. A.; Terasranta, H.; Thompson, D.J.; Weekes, T.C.; Wilson, C.; Zweerink, J. (1997)

    • Discovery of a precessing jet nozzle in BL Lacertae 

      Stirling, A.M.; Cawthorne, T.V.; Stevens, J. A.; Jorstad, S.G.; Marscher, A.P.; Lister, M.; Gomez, J-L.; Smith, P.S.; Agudo, I.; Gabuzda, D.; Robson, E.I.; Gear, W.K. (2003)

    • Dust in spiral galaxies: global properties 

      Stevens, J. A.; Amure, M.; Gear, W.K. (2005-02)

    • The dust morphology of the elliptical Galaxy M 86 with SPIRE 

      Gomez, H.L.; Baes, M.; Cortese, L.; Smith, M. W. L.; Boselli, A.; Ciesla, L.; Bendo, G. J.; Pohlen, M.; di Serego Alighieri, S.; Auld, R.; Barlow, M.J.; Bock, J. J.; Bradford, M.; Buat, V.; Castro-Rodriguez, N.; Chanial, P.; Charlot, S.; Clements, D. L.; Cooray, A.; Cormier, D.; Davies, J. I.; Dwek, E.; Eales, S.; Elbaz, D.; Galametz, M.; Galliano, F.; Gear, W.K.; Glenn, J.; 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.; Rangwala, N.; Rigby, E. E.; Roussel, H.; Rykala, A.; Sacchi, N.; Sauvage, M.; Schirm, M. R. P.; Schulz, B.; Spinoglio, L.; Srinivasan, S.; Stevens, Jason; Symeonidis, M.; Trichas, M.; Vaccari, M.; Vigroux, L.; Wilson, C.D.; Wozniak, H.; Wright, G.S.; Zeilinger, W.W. (2010-07-01)
      We present Herschel-SPIRE observations at 250–500 μm of the giant elliptical galaxy M 86 and examine the distribution of the resolved cold dust emission and its relation with other galactic tracers. The SPIRE images reveal ...

    • Dust, Gas, and the Evolutionary Status of the Radio Galaxy 8C 1435+635 at z = 4.25 

      Ivison, R.J.; Dunlop, J.S.; Hughes, D.H.; Archibald, E.N.; Stevens, J. A.; Holland, W.S.; Robson, E.I.; Eales, S.; Rawlings, S.; Dey, A.; Gear, W.K. (1998)
      We present the results of new rest-frame far-IR observations of the z\4.25 radio galaxy 8C 1435]635, which not only conÐrm that it contains an enormous quantity of dust (as Ðrst inferred from its millimeter-wave detection ...

    • The Herschel Space Observatory view of dust in M81 

      Bendo, G. J.; Wilson, C. D.; Pohlen, M.; Sauvage, M.; Auld, R.; Baes, M.; Barlow, M.J.; Bock, J. 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.; Davies, J.I.; 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.; Rangwala, N.; Rigby, E. E.; Roussel, H.; Rykala, A.; Sacchi, N.; Schulz, B.; Schirm, M. R. P.; Smith, M. W. L.; Spinoglio, L.; Stevens, Jason; Sundar, S.; Symeonidis, M.; Trichas, M.; Vaccari, M.; Vigroux, L.; Wozniak, H.; Wright, G. S.; Zeilinger, W.W. (2010-07-01)
      We use Herschel Space Observatory data to place observational constraints on the peak and Rayleigh-Jeans slope of dust emission observed at 70–500 μm in the nearby spiral galaxy M81. We find that the ratios of wave bands ...

    • The Herschel-SPIRE instrument and its in-flight performance 

      Griffin, M.J.; Abergel, A.; Abreu, A.; Ade, P.A.R.; André, P.; Augueres, J.-L.; Babbedge, T.; Bae, Y.; Baillie, T.; Baluteau, J.-P.; Barlow, M.J.; Bendo, G.; Benielli, D.; Bock, J.; Bonhomme, P.; Brisbin, D.; Brockley-Blatt, C.; Caldwell, M.; Cara, C.; Castro-Rodriguez, N.; Cerulli, R.; Chanial, P.; Chen, S.; Clark, E.; Clements, D. L.; Clerc, L.; Coker, J.; Communal, D.; Conversi, L.; Cox, P.; Crumb, D.; Cunningham, C.; Daly, F.; Davis, G. R.; de Antoni, P.; Delderfield, J.; Devin, N.; di Giorgio, A.; Didschuns, I.; Dohlen, K.; Donati, M.; Dowell, A.; Dowell, C.D.; Duband, L.; Dumaye, L.; Emery, R. J.; Ferlet, M.; Ferrand, D.; Fontignie, J.; Fox, M.; Franceschini, A.; Frerking, M.; Fulton, T.; Garcia, J.; Gastaud, R.; Gear, W.K.; Glenn, J.; Goizel, A.; Griffin, D.K.; Grundy, T.; Guest, S.; Guillemet, L.; Hargrave, P. C.; Harwit, M.; Hastings, P.; Hatziminaoglou, E.; Herman, M.; Hinde, B.; Hristov, V.; Huang, M.; Imhof, P.; Isaak, K.J.; Israelsson, U.; Ivison, R.J.; Jennings, D.; Kiernan, B.; King, K.J.; Lange, A. E.; Latter, W.; Laurent, G.; Laurent, P.; Leeks, S. J.; Lellouch, E.; Levenson, L.; Li, B.; Li, J.; Lilienthal, J.; Lim, T.; Liu, S. J.; Lu, N.; Madden, S.; Mainetti, G.; Marliani, P.; McKay, D.; Mercier, K.; Molinari, S.; Morris, H.; Moseley, H.; Mulder, J.; Mur, M.; Naylor, D.A.; Nguyen, H.; O'Halloran, B.; Oliver, S.; Olofsson, G.; Olofsson, H.-G.; Orfei, R.; Page, M.J.; Pain, I.; Panuzzo, P.; Papageorgiou, A.; Parks, G.; Parr-Burman, P.; Pearce, A.; Pearson, C.; Pérez-Fournon, I.; Pinsard, F.; Pisano, G.; Podosek, J.; Pohlen, M.; Polehampton, E.T.; Pouliquen, D.; Rigopoulou, D.; Rizzo, D.; Roseboom, I.G.; Roussel, H.; Rowan-Robinson, M.; Rownd, B.; Saraceno, P.; Sauvage, M.; Savage, R.; Savini, G.; Sawyer, E.; Scharmberg, C.; Schmitt, D.; Schneider, N.; Schulz, B.; Schwartz, A.; Shafer, R.; Shupe, D. L.; Sibthorpe, B.; Sidher, S.; Smith, A.; Smith, A. J.; Smith, Daniel; Spencer, L.; Stobie, B.; Sudiwala, R.; Sukhatme, K.; Surace, C.; Stevens, Jason; Swinyard, B. M.; Trichas, M.; Tourette, T.; Triou, H.; Tseng, S.; Tucker, C.; Turner, A.; Vaccari, M.; Valtchanov, I.; Vigroux, L.; Virique, E.; Voellmer, G.; Walker, H.; Ward, R.; Waskett, T.; Weilert, M.; Wesson, R.; White, G.J.; Whitehouse, N.; Wilson, C.D.; Winter, B.; Woodcraft, A. L.; Wright, G. S.; Xu, C.K.; Zavagno, A.; Zemcov, M.; Zhang, L.; Zonca, E. (2010-07-01)
      The Spectral and Photometric Imaging REceiver (SPIRE), is the Herschel Space Observatory`s submillimetre camera and spectrometer. It contains a three-band imaging photometer operating at 250, 350 and 500 μm, and an imaging ...

    • High Energy Gamma Radiation From PKS 0528+134 Observed by EGRET 

      Mukherjee, R.; Gear, W.K.; Marscher, A.P.; Moore, E.M.; Travis, J.P.; Zhang, Y.; Robson, E.I.; Stevens, J. A.; Terasranta, H.; Tornikoski, M.; Wagner, S. (Astronomical Society of the Pacific, 1996)
      A summary of EGRET observations of PKS 0528+134 is given, with special emphasis on the 1993 March observations when the source flared in gamma-rays. The flux history of PKS 0528+134 as well as spectra of the source are ...

    • High spatial resolution observations of CUDSS14A: a SCUBA-selected ultraluminous galaxy at high redshift 

      Gear, W.K.; Lilly, S.; Stevens, J. A.; Clements, D.; Webb, T.; Eales, S.; Dunne, L. (2000)
      We present a high-resolutionmillimetre interferometric image of the brightest SCUBA- selected galaxy from the Canada-UK deep SCUBA survey (CUDSS). We make a very clear detection at 1.3 mm, but fail to resolve any structure ...

    • Jet Kinematics of AGNs at High Radio Frequencies 

      Jorstad, S.G.; Marscher, A.P.; Lister, M.; Stirling, A.M.; Cawthorne, T.V.; Gomez, J-L.; Gear, W.K.; Stevens, J. A.; Robson, E.I.; Smith, P.S.; Forster, J.R. (Astronomical Society of the Pacific, 2006)
      We have completed a 3 yr program of polarization monitoring of 15 active galactic nuclei with the Very Long Baseline Array at 7 mm wavelength. At some epochs the images are accompanied by nearly simultaneous polarization ...

    • Measures of star formation rates from infrared (Herschel) and UV (GALEX) emissions of galaxies in the HerMES fields 

      Buat, V.; Giovannoli, E.; Burgarella, D.; Altieri, B.; Amblard, A.; Arumugam, V.; Aussel, H.; Babbedge, T.; Blain, A.W.; Bock, J.; Boselli, A.; Castro-Rodriguez, N.; Cava, A.; Chanial, P.; Clements, D.; Conley, A.; Conversi, L.; Cooray, A.; Dowell, C.D.; Dwek, E.; Eales, S.; Elbaz, D.; Fox, M.; Franceschini, A.; Gear, W.K.; Glenn, J.; Griffin, M.; Halpern, M.; Hatziminaoglou, E.; Heinis, S.; Ibar, E.; Isaak, K.G.; Ivison, R.J.; Lagache, G.; Levenson, L.; Lonsdale, C.J.; Lu, N.; Madden, S.; Maffei, B.; Magdis, G.; Mainetti, G.; Marchetti, L.; Morrison, G.E.; Nguyen, H.T.; O'Halloran, B.; Oliver, S.; Omont, A.; Owen, F.; Page, M.J.; Pannella, M.; Papageorgiou, A.; Pearson, C.; Perez-Fournon, I.; Pohlen, M.; Rigopoulou, D.; Rizzo, D.; Roseboom, I.G.; Rowan-Robinson, M.; Portal, M.S.; Schulz, B.; Seymour, N.; Shupe, D.; Smith, A.J.; Stevens, J. A.; Strazzullo, V.; Symeonidis, M.; Trichas, M.; Tugwell, K.E.; Vaccari, M.; Valiante, E.; Valtchanov, I.; Vigroux, L.; Wang, L.; Ward, R.; Wright, G.; Xu, C.K.; Zemcov, M. (2010)
      The reliability of infrared (IR) and ultraviolet (UV) emissions to measure star formation rates (SFRs) in galaxies is investigated for a large sample of galaxies observed with the Spectral and Photometric Imaging Receiver ...

    • A Millimetre/Submillimetre Polarization Survey of Compact Flat-Spectrum Radio Sources 

      Nartallo, R.; Gear, W.K.; Murray, A.G.; Robson, E.I.; Hough, J. (1998)

    • Modelling the millimetre-infrared flaring behaviour of the quasar 1253-055 (3C279) 

      Litchfield, S.J.; Stevens, J. A.; Robson, E.I.; Gear, W.K. (1995)
      The infrared through millimetre light curve of 3C279 is investigated for the period of 1986 until mid-1994, during which time several flares were observed. A quiescent spectrum (identified with emission from an underlying ...

    • Multi-frequency Polarization Properties of Blazars 

      Jorstad, S.G.; Marscher, A.P.; Stevens, J. A.; Robson, E.I.; Lister, M.; Stirling, A.M.; Smith, P.S.; Cawthorne, T.V.; 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, accompanied at many epochs by nearly simultaneous measurements of polarization at 1.35/0.85 mm and at optical wavelengths. ...

    • Multifrequency observations of blazars. 5: Long-term millimeter, submillimeter, and infrared monitoring 

      Stevens, Jason; Litchfield, S.J.; Robson, E.I.; Hughes, D.H.; Gear, W.K.; Terasranta, H.; Valtaoja, E.; Tornikoski, M. (1994-12-01)
      Multifrequency monitoring data are presented for 17 blazars between 375 and 22 GHz. These data are used to study the overall flaring behavior of blazars, and, in particular, to test predictions of shock models for the early ...

    • Multiwaveband polarimetric observations of 15 active galactic nuclei at high frequencies: correlated polarization behaviour 

      Jorstad, S.G.; Marscher, A.P.; Stevens, J. A.; Smith, P.S.; Forster, J.R.; Gear, W.K.; Cawthorne, T.V.; Lister, M.; Stirling, A.M.; Gomez, J-L.; Greaves, J.S.; Robson, E.I. (2007)

    • Multiwavelength Observations of a Dramatic High-Energy Flare in the Blazar 3C 279 

      Wehrle, A. E.; Pian, E.; Urry, C.M.; Maraschi, L.; McHardy, I.M.; Lawson, A.J.; Ghisellini, G.; Hartman, R.C.; Madejski, G.M.; Makino, F.; Marscher, A.P.; Wagner, S.J.; 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.; Kazanas, D.; Kidger, M.R.; Kii, T.; Kollgaard, R.I.; Kondo, Y.; Kurfess, J.; Lin, Y.C.; McCollum, B.; McNaron-Brown, K.; Nagase, F.; Nair, A.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.; Sillanpaeae, A.; Smith, P.S.; Stevens, Jason; Stocke, J.; Takalo, L.O.; Teraesranta, H.; Thompson, D.J.; Thompson, R.; Tornikoski, M.; Tosti, G.; Treves, A.; Turcotte, P.; Unwin, S.C.; Valtaoja, E.; Villata, M.; Xu, W.; Yamashita, A.; Zook, A. (1998-04-01)
      The blazar 3C 279, one of the brightest identified extragalactic objects in the γ-ray sky, underwent a large (factor of ~10 in amplitude) flare in γ-rays toward the end of a 3 week pointing by Compton Gamma Ray Observatory ...

    • Multiwavelength Observations of Markarian 421 During a TeV/X-Ray Flare 

      Macomb, D.J.; Akerlof, C.; Aller, H. D.; Aller, M. F.; Bertsch, D. L.; Bruhweiler, F.; Buckley, J.H.; Carter-Lewis, D.A.; Cawley, M.F.; Cheng, K.-P.; Dermer, C.; Fegan, D.J.; Gaidos, J.A.; Gear, W.K.; Hall, C.R.; Hartman, R.C.; Hillas, A.M.; Kafatos, M.; Kerrick, A.D.; Kniffen, D.A.; Kondo, Y.; Kubo, H.; Lamb, R.C.; Makino, F.; Makishima, K.; Marscher, A.; McEnery, J.; McHardy, I.M.; Meyer, D.I.; Moore, E.M.; Ramos, E.; Robson, E.I.; Rose, H.J.; Schubnell, M.S.; Sembroski, G.; Stevens, Jason; Takahashi, T.; Tashiro, M.; Weekes, T.C.; Wilson, C.; Zweerink, J. (1995-08-01)
      A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. ...