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Browsing by Author "Saikia, D. J"

Browsing by Author "Saikia, D. J"

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  • Evidence for Low-power Radio Jet–ISM Interaction at 10 pc in the Dwarf AGN Host NGC 4395 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Riffel, Rogemar A; Manna, Arijit; Pal, Sabyasachi; Dors, O. L; Wylezalek, Dominika; Paliya, Vaidehi S; Saikia, Payaswini; Dabhade, Pratik; Patig, Markus-Kissler; Sagar, R (American Astronomical Society, 2023-12-20)
    Black-hole-driven outflows in galaxies hosting active galactic nuclei (AGN) may interact with their interstellar medium (ISM) affecting star formation (SF). Such feedback processes, reminiscent of those seen in ...
  • Highlights from the observatories 
    Saikia, D. J (Astronomical Society of India, 2005-03)
  • A Low-Frequency Study of Recently Identified Double-Double Radio Galaxies 
    Nandi, S; Saikia, D. J; Roy, R; Dabhade, P.; Wadadekar, Y; Larsson, J; Baes, M; Chandola, H. C; Singh, M (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    n order to understand the possible mechanisms of recurrent jet activity in radio galaxies and quasars, which are still unclear, we have identified such sources with a large range of linear sizes (220–917 kpc), and hence ...
  • A multifrequency study of the large radio galaxies 3C46 and 3C452 
    Nandi, S; Pirya, A; Pal, S; Konar, C; Saikia, D. J; Singh, M (Wiley-Blackwell, 2010-05)
    We present low-frequency observations starting from ∼150 MHz with the Giant Metrewave Radio Telescope, and high-frequency observations with the Very Large Array of two large radio galaxies 3C46 and 3C452. These observations ...
  • Narrow-line Seyfert 1 galaxies in Sloan Digital Sky Survey: a new optical spectroscopic catalogue 
    Paliya, Vaidehi S; Stalin, C. S; Dominguez, Alberto; Saikia, D. J (Oxford University Press on behalf of Royal Astronomical Society, 2024-01)
    Narrow-line Seyfert 1 (NLSy1) galaxies are an enigmatic class of active galactic nuclei (AGN) that exhibit peculiar multiwavelength properties across the electromagnetic spectrum. For example, these sources have allowed ...
  • The Ooty Summer Training Program 1990 
    Saikia, D. J; Salter, C. J; Banhatti, D. G; Ghosh, T; Gothoskar, P; Manoharan, P. K (Astronomical Society of India, 1991)
  • Polarization Asymmetry in CSS Sources 
    Saikia, D. J; Gupta, N (Astronomical Society of India, 2003)
    We show that the compact steep spectrum sources are more asymmetric in the polarization of the outer lobes compared with the more extended ones. This could be due to interaction of the jets with infalling material, which ...
  • Radio observations of the S0 galaxy NGC 1218 (3C 78) 
    Saikia, D. J; Subrahmanya, C. R; Patnaik, A. R; Unger, S. W; Cornwell, T. J; Graham, D. A; Prabhu, T. P (Royal Astronomical Society, 1986-04)
    The authors present VLA observations of the S0 galaxy NGC 1218 at λ20 and 6 cm with both the A and D arrays, at λ20 cm with the B array and at λ2 and 1.3 cm with the A array. They also present VLBI observations at λ6 cm ...
  • Radio Study of a Superwind-galaxy: NGC1482 
    Hota, A; Saikia, D. J (Astronomical Society of India, 2003)
    We present GMRT and VLA observations of the superwind galaxy, NGC1482, which has been discovered to have a remarkable hour-glass shaped optical emission line outflow on both sides of the galactic disk. The central region ...
  • Relativistic beams, thick accretion disks and active galactic nuclei 
    Wiita, P. J; Kapahi, V. K; Saikia, D. J (Astronomical Society of India, 1982-12)
    We review recent analyses of observations of radio galaxies and quasars that support the relativistic beaming models and appear to produce values for the Lorentz factors of the radiating mateiral in the nuclear jets. Thick ...
  • Star Formation in the Dwarf Seyfert Galaxy NGC 4395: Evidence for Both AGN and SN Feedback? 
    Nandi, Payel; Stalin, C. S; Saikia, D. J; Muneer, S; Mountrichas, George; Wylezalek, D; Sagar, R; Patig, M. K (American Astronomical Society, 2023-06-20)
    We present a detailed multiwavelength study of star formation in the dwarf galaxy NGC 4395, which hosts an active galactic nucleus (AGN). From our observations with the Ultra-Violet Imaging Telescope, we have compiled a ...
  • A Study of Giant Radio Galaxies 
    Konar, C; Saikia, D. J; Ishwara-Chandra, C. H; Kulkarni, V. K (Astronomical Society of India, 2003)
    Multi-frequency radio observations have been made of a sample of 17 giant radio galaxies, many of whose structures were not well determined earlier. These sources were observed with the VLA D- and B/C arrays at C and L ...
  • TXS 1433+205: The most distant gamma-ray emitting FR II radio galaxy 
    Paliya, Vaidehi S; Saikia, D. J; Stalin, C. S (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    The orientation of the jet axis to the line of sight of the observer plays a major role in explaining the phenomena observed from blazars and radio galaxies. In the γ -ray band, only a handful of radio galaxies have been ...

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