Browsing by Author "Tornikoski, M."

Now showing items 1-9 of 9

    • 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). ...

    • 3C 279 Multiwavelength Monitoring II : The Ground-based Campaign 

      Grandi, P.; Urry, C.M.; Maraschi, L.; Wehrle, A. E.; Madejski, G. M.; Aller, M. F.; Aller, H. D.; Bailyn, C. D.; Balonek, T.J.; Bock, T. H.; Glass, I. S.; Litchfield, S.J.; McHardy, I.M.; Mulchaey, J. S.; Reuter, H.-P.; Robson, E. I.; Sadun, A. C.; Sherry, W.; Steppe, H.; Stevens, Jason; Teraesranta, H.; Tornikoski, M.; Wagner, S.J. (1996-03-01)
      The optically violently variable quasar 3C 279 was monitored simultaneously from radio to y-ray frequencies in 1992 December-1993 January. We report a detailed study of the ground-based results from radio to optical ...

    • A Gamma-Ray Flare in NRAO 190 

      McGlynn, T. A.; Hartman, R. C.; Bloom, S. D.; Aller, M.; Aller, H.; Filippenko, A. V.; Barth, A. J.; Gear, W. K.; Marscher, A. P.; Mattox, J. R.; Reich, W.; Robson, E. I.; Schramm, J.; Stevens, Jason; Teraesranta, H.; Tornikoski, M.; Vestrand, W. T.; Wagner, S.; Heines, A. (1997-05-01)
      We describe observations of the quasi-stellar object (QSO) NRAO 190 during a gamma-ray flare from 1994 August 9 to 1994 August 29. This QSO was serendipitously detected by the EGRET instrument on the Compton Gamma Ray ...

    • 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 ...

    • 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 ...

    • 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 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 ...

    • The Spectral Evolution of High-Frequency Radio Outbursts in the Blazar PKS:0420-014 

      Stevens, Jason; Litchfield, S. J.; Robson, E. I.; Gear, W. K.; Terasranta, H.; Tornikoski, M.; Valtaoja, E. (1995-08-01)
      Multifrequency monitoring data between 375 and 22 GHz are used to investigate spectral evolution of radio outbursts in the blazar 0420-014. It is shown that, after subtraction of the underlying `quiescent' emission, the ...

    • Synchrotron flaring in the jet of 3C 279 

      Lindfors, E.J.; Turler, M.; Valtaoja, E.; Aller, H.; Aller, M.; Mazin, D.; Raiteri, C.M.; Stevens, J. A.; Tornikoski, M.; Tosti, G.; Villata, M. (2006)