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Browsing by Subject "Active Galactic Nuclei"

Browsing by Subject "Active Galactic Nuclei"

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  • Acceleration and radiation processes around active galactic nuclei 
    Krishan, V (D. Reidel Publishing Co., 1985-10)
    It is proposed that the region containing fast particles, electrostatic and electromagnetic fields, around active galactic nuclei is responsible for generating electromagnetic emissions from γ-rays to radio waves. The ...
  • Fast Plasma Processes in Active Galactic Nuclei 
    Krishan, V (Springer, 1997-05)
    The physics of active galactic nuclei (AGN) and related objects is one of the most actively pursued areas in astrophysics. Their large luminosities over the entire electromagnetic spectrum combined with extremely short-time ...
  • High energy universe -- Satellite missions 
    Krishan, V (Indian Academy of Sciences, 2000-12)
    A variety of satellite missions to observe the high energy universe are currently operating and some more with more versatility and capability are on the anvil. In this paper, after giving a brief introduction to the ...
  • Jet in seyfert galaxies 
    Shastri, P; Lal, D. V; Gabuzda, D. C (Astronomical Society of the Pacific, 2003)
    We will present the main results from a study of the pc-scale radio structure of our matched sample of Seyfert galaxies, specifically selected to test the Unified Scheme. We chose purportedly face-on (Seyfert 1) and edge-on ...
  • On the nature of the compact condensations at the centre of galaxies 
    Mitra, A (Astronomical Society of India, 2002)
    There are many observational evidences for the existence of massive compact condensations in the range 106 - 1010 M? at the core of various galaxies and in particular in the core of High Energy Gamma Ray emitting galaxies. ...
  • On the origin of highest energy cosmic rays 
    Sigl, G; Schramm, D. N; Bhattacharjee, P (Elsevier, 1994-09)
    In this paper we show that the conventional diffusive shock acceleration mechanism for cosmic rays associated with relativistic astrophysical shocks in active galactic nuclei (AGNs) has severe difficulties to explain the ...
  • Plasma mechanisms for variability in active galactic nuclei 
    Krishan, V; Wiita, P J (1994-03)
    We consider several physical processes, dominated by plasma effects, that might play roles in producing variability in Active Galactic Nuclei (AGN). One class of processes involves oscillations in the plasma itself. If ...
  • Production of the active galactic nuclei continuum via coherent plasma processes 
    Krishan, V (Cambridge University Press, 1988)
    It appears possible to explain both the typical continuum electromagnetic spectrum and the relativistic velocities of electrons in the region of an active galactic nucleus (AGN) around a supermassive black hole (SMBH) by ...
  • Rapid polarization variability in intense sources 
    Gangadhara, R. T; Krishan, V (The American Astronomical Society, 1995-02)
    We have recently reported the polarization changes of the intense electromagnetic radiation, in active galactic nuclei and pulsars, due to stimulated Raman scattering. In this paper, we show that the incident and the ...
  • Relativistic beaming in active galactic nuclei 
    Shastri, Prajval (Tata Institute of Fundamental Research, 1989)
  • Seyferts and their radio morphology 
    Shastri, P (Taylor and Francis, 2001-08)
    In this short review, current knowledge of the radio structure of Seyfert Galaxies is briefly outlined and its application in addressing 3 key debates, viz., the validity of the Unified Scheme, the validity of the starburst ...
  • Some constraints on quasar progenitors and quasar evolution 
    Sivaram, C (International Astronomical Union, 1986)
  • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. 6: Variability of NGC 3783 from ground-based data 
    Stirpe, G. M; Winge, C; Altieri, B; Alloin, D; Aguero, E. L; Anupama, G. C; Ashley, R; Bertram, R; Calderon, J. H; Catchpole, R. M; Corradi, R. L. M; Covino, E; Dottori, H. A; Feast, M. W; Ghosh, K. K; Hutton, R. Gil; Glass, I. S; Grebel, E. K; Jorda, L; Koen, C; Laney, C. D; Maia, M; Marang, F; Mayya, Y. D; Morrell, N; Nakada, Y; Pastoriza, M. G; Pati, A. K; Pelat, D; Peterson, B. M; Prabhu, T. P; Roberts, G; Sagar, R; Salamanca, I; Sekiguchi, K; Storchi-Bergmann, T; Subramaniam, A; Van Winckel, H; Van Wyk, F; Villada, M; Wagner, R. M; Whitelock, P. A; Winkler, H; Clavel, J; Dietrich, M; Kollatschny, W; O'Brien, P. T; Perola, G. C; Recondo-Gonzalez, M. C; Rodriguez-Pascual, P; Santos-Lleo, M (The American Astronomical Society, 1994-04)
    The Seyfert 1 galaxy NGC 3783 was intensely monitored in several bands between 1991 December and 1992 August. This paper presents the results from the ground-based observations in the optical and near-IR bands, which ...

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