Browsing by Author "Robson, E.I."

Now showing items 1-20 of 35

    • The 1993 multiwavelength campaign on 3C 279 : the radio to gamma-ray energy distribution inlow state 

      Maraschi, L.; Grandi, P.; Urry, C.M.; Wehrle, A. E.; Madejski, G.M.; Fink, H.; Ghisellini, G.; Hartman, R.C.; Koratkar, A.P.; von Montigny, C.; Pian, E.; Thomas, H.C.; Treves, A.; Aller, M. F.; Aller, H. D.; Bailyn, C. D.; Balonek, T.J.; Bock, H.; Collmar, W.; Glass, I.S.; Litchfield, S.J.; McHardy, I.M.; Mendez, R.; Pesce, J.; Reuter, H.-P.; Robson, E.I.; Steppe, H.; Stevens, Jason; Teraesranta, H.; Wagner, S.J. (1994-11-01)
      Simultaneous observations of 3C 279 at radio, millimeter, near-infrared, optical, ultraviolet (with IUE) and X-ray (with ROSAT) wavelengths were obtained in 1992 December-1993 January, during a three week pointing at the ...

    • 30 years of multi-wavelength observations of 3C 273 

      Turler, M.; Paltani, S.; Courvoisier, T. J-L.; Aller, M.; Aller, H.; Blecha, A.; Bouchet, P.; Lainela, M.; McHardy, I.M.; Robson, E.I.; Stevens, J. A.; Terasranta, H.; Tornikoski, M.; Ulrich, M. H.; Waltman, E.B.; Wamsteker, W.; Wright, M.C.H. (1999)
      We present a wide multi-wavelength database of most observations of the quasar 3C273 obtained during the last 30 years. This database is the most complete set of observations available for an active galactic nucleus (AGN). ...

    • Automated Reduction and Calibration of SCUBA Archive Data Using ORAC-DR 

      Jenness, T.; Stevens, J. A.; Archibald, E.N.; Economou, F.; Jessop, N.; Robson, E.I.; Tilanus, R.P.J.; Holland, W.S. (Astronomical Society of the Pacific, 2001)
      The Submillimetre Common User Bolometer Array (SCUBA) instrument has been operating on the James Clerk Maxwell Telescope (JCMT) since 1997. The data archive is now sufficiently large that it can be used for investigating ...

    • 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. (Wolters 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, 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 Evolution of the Centimeter-Submillimeter Spectrum of 3C 345 during Outburst 

      Stevens, Jason; Litchfield, S.J.; Robson, E.I.; Cawthorne, T.V.; Aller, M. F.; Aller, H. D.; Hughes, P.A.; Wright, M.C.H. (1996-07-01)
      Monitoring data between 375 and 4.8 GHz are presented for the blazar 3C 345 between 1989 and 1995, during which period the source flared. The multifrequency light curves are used to construct snap-shot spectra that span ...

    • 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 ...

    • 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 ...

    • A Jetdriven, Extreme High-Velocity Outflow Powered by a Cold, Low-Luminosity Protostar near NGC 2023 

      Sandell, G.; Avery, L.W.; Baas, F.; Coulson, I.M.; Dent, W.R.; Friberg, P.; Gear, W.P.K.; Greaves, J.S.; Holland, W.S.; Jenness, T.; Jewell, P.; Lightfoot, J.F.; Matthews, H.; Moriarty-Schieven, G.; Prestage, R.; Robson, E.I.; Stevens, J. A.; Tilanus, R.P.J.; Watt, G.D. (1999)

    • Millimetre and submillimetre continuum observations of the core and hotspots of Cygnus A 

      Robson, E.I.; Leeuw, L.; Stevens, J. A.; Holland, W.S. (1998)
      We present millimetre photometry and submillimetre imaging of the central core and two hotspots in the radio lobes of the galaxy Cygnus A. For both hotspots and the central core, the synchrotron spectrum continues smoothly ...

    • 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. ...