IIA Institutional Repository

Browsing by Subject "Galaxies: Nuclei"

Browsing by Subject "Galaxies: Nuclei"

Sort by: Order: Results:

  • Active nucleus in a post-starburst galaxy: KUG 1259+280 
    Dewangan, G. C; Singh, K. P; Mayya, Y. D; Anupama, G. C (The Royal Astronomical Society, 2000-10)
    We report the discovery of an active nucleus in a post-starburst galaxy, KUG 1259+280, based on its X-ray and optical characteristics. The X-ray source in KUG 1259+280 was detected during a search for ultrasoft sources in ...
  • Description of accretion induced outflows from ultra-luminous sources to under-luminous AGNs 
    Ghosh, Shubhrangshu; Mukhopadhyay, Banibrata; Krishan, V; Khan, Manoranjan (Elsevier, 2010-01)
    We study the energetics of the accretion-induced outflow and then plausible jet around black holes/compact objects using a newly developed disc-outflow coupled model. Inter-connecting dynamics of outflow and accretion ...
  • Further evidence for intra-night optical variability of radio-quiet quasars 
    Goyal, Arti; Gopal-Krishna; Sagar, R; Anupama, G. C; Sahu, D. K (Astronomical Society of India, 2007-06)
    Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with good ...
  • Optical Variability of BL Lacertae during the Major Outburst of 1997 
    Ghosh, K. K; Ramsey, B. D; Sadun, A. C; Soundararajaperumal, S; Wang, J (The American Astronomical Society, 2000-07)
    We have undertaken an investigation of recent flux variability in BL Lac. We present optical observations taken over 22 nights documenting major as well as minor outbursts. This has been combined, for purposes of multifrequency ...
  • Pc-scale study of radio galaxies and BL Lacs 
    Kharb, P; Shastri, P; Gabuzda, D. C (Elsevier, 2003-10)
    We study two aspects of the differences between Active Galactic Nuclei (AGN) of the two Fanaroff-Riley types in order to investigate the causes of the F-R divide. We: (a) contrast the properties of the optical cores in ...
  • Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. X. Variability of Fairall 9 from Optical Data 
    Santos-Lleo, M; Chatzichristou, E; de Oliveira, C. M; Winge, C; Alloin, D; Peterson, B. M; Rodriguez-Pascual, P. M; Stirpe, G. M; Beers, T; Bragaglia, A; Claeskens, J. F; Federspiel, M; Giannuzzo, E; Gregorio-Hetem, J; Mathys, G; Salamanca, I; Stein, P; Stenholm, B; Wilhelm, R; Zanin, C; Albrecht, P; Calderon, J; Caretta, C. A; Carranza, G; da Costa, R. D. D; Diaz, R; Dietrich, M; Dottori, H; Elizalde, F; Goldes, G; Ghosh, K. K; Maia, M. A. G; Paolantonio, S; de Oliveira Filho, R. I; Rodriguez-Ardila, A; Schmitt, H. R; Soundararajaperumal, S; de Souza, R. E; Willmer, C. N. A; Zheng, W (American Astronomical Society, 1997-10)
    The results of an optical monitoring campaign on the active nucleus in the luminous Seyfert 1 galaxy Fairall 9 are presented. This campaign was undertaken in parallel with ultraviolet spectroscopic monitoring with the IUE ...
  • X-Ray variability of active galactic nuclei in the soft and hard X-Ray bands 
    Chitnis, V. R; Pendharkar, J. K; Bose, D; Agrawal, V. K; Rao, A. R; Misra, R (Institute of Physics, 2009-06)
    We investigate the X-ray variability characteristics of hard X-ray-selected active galactic nuclei (AGNs)—based on Swift/Burst Alert Telescope—in the soft X-ray band using the Rossi X-ray Timing Explorer/All-Sky Monitor ...

Search DSpace

Browse

My Account