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Browsing by Author "Nandi, S."

Browsing by Author "Nandi, S."

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  • Double-double radio galaxies from the First survey 
    Nandi, S.; Saikia, D. J. (Astronomical Society of India, 2012)
    The radio structures and optical identifications of a sample of 242 sources classified as double-double radio sources by Proctor (2011) from a morphological study of sources in the FIRST (Faint Images of the Radio Sky ...
  • The Double–Double Radio Galaxy 3C293 
    Joshi, S. A.; Nandi, S.; Saikia, D. J.; Ishwara-Chandra, C. H.; Konar, C. (2011)
    We present the results of radio continuum observations at frequencies ranging from ∼150–5000 MHz of the misaligned double– double radio galaxy (DDRG) 3C293 (J1352+3126) using the GMRT and the VLA, and estimate the time-scale ...
  • The Dynamics of Radio Galaxies and Double–Double Radio Galaxies 
    Konar, C.; Jamrozy, M.; Hardcastle, M. J.; Croston, J. H.; Nandi, S.; Saikia, D. J.; Machalski, J (2011)
    Relativistic and magnetized plasma ejected by radio loud AGNs through jets form the diffuse lobes of radio galaxies. The radiating particles (electron/electron–positron) in lobes emit in radio via the synchrotron process ...
  • Giant radio galaxies: problems of understanding and problems for CMB? 
    Verkhodanov, O. V.; Khabibullina, M. L.; Singh, M.; Priya, A.; Verkhodanova, N. V.; Nandi, S. (2008)
    Giant radio galaxies (GRGs) are considered as the largest single object in the Universe. They have sizes up to 12 Mpc. The reason of this is still unclear. However, several groups study these galaxies and explain the their ...
  • A low-frequency study of two asymmetric large radio galaxies 
    Priya, A.; Nandi, S.; Saikia, D. J.; Singh, M. (2011)
    We present the results of multifrequency observations of two asymmetric, Mpc-scale radio sources with the Giant Metrewave Radio Telescope (GMRT) and the Very Large Array (VLA). The radio luminosity of these two sources, ...
  • A multifrequency study of the large radio galaxies 3C46 and 3C452 
    Nandi, S.; Pirya, A.; Pal, S.; Konar, C.; Saikia, D. J.; Singh, M. (2010)
    We present low-frequency observations starting from ~150MHz with the Giant Metrewave Radio Telescope, and high-frequency observations with theVery Large Array of two large radio galaxies 3C46 and 3C452. These observations ...
  • A multiwavelength study of five large radio galaxies 
    Priya, A.; Nandi, S.; Saikia, D. J.; Konar, C.; Singh, M. (2011)
    We present the results of GMRT and VLA observations of five large radio sources over a wide frequency range to investigate their structural and spectral asymmetries. The hot-spot brightness ratios suggest intrinsic source ...
  • Radio spectra of giant radio galaxies from RATAN-600 data 
    Khabibullina, M. L.; Verkhodanov, O. V.; Singh, M.; Priya, A.; Verkhodanova, N. V.; Nandi, S. (2010)
    Measurements of the flux densities of the extended components of seven giant radio galaxies obtained using the RATAN-600 radio telescope at wavelengths of 6.25 and 13 cm are presented. The spectra of components of these ...
  • Rejuvenated radio galaxies J0041+3224 and J1835+6204: how long can the quiescent phase of nuclear activity last? 
    Konar, C.; Hardcastle, M. J.; Jamrozy, M.; Croston, J. H.; Nandi, S. (2012)
    We present radio observations of two well-known double–double radio galaxies, J0041+3224 and J1835+6204, at frequencies ranging from 150 to 8460 MHz, using both the Giant Metrewave Radio Telescope and the Very Large ...
  • A Second Set of RATAN-600 Observations of Giant Radio Galaxies 
    Khabibullina, M. L.; Verkhodanov, O. V.; Singh, M.; Pirya, A.; Nandi, S.; Verkhodanova, N. V. (2011)
    Results of RATAN-600 centimeter-wavelength flux-density measurements of the extended components in five giant radio galaxies are reported. The spectra of the components of these radio galaxies have been constructed using ...
  • SN 2007uy – metamorphosis of an aspheric Type Ib explosion 
    Roy, R., et. al.; Kumar, Brijesh; Nandi, S.; Misra, K.; Kumar, Brajesh; Pandey, S. B.; Sagar, R. (Wiley Online, 2013)
    The supernovae (SNe) of Type Ibc are rare and the detailed characteristics of these explosions have been studied only for a few events. Unlike Type II SNe, the progenitors of Type Ibc have never been detected in pre-explosion ...
  • A study of giant radio galaxies at RATAN-600 
    Khabibullina, M. L.; Verkhodanov, O. V.; Singh, M.; Pirya, A.; Nandi, S.; Verkhodanova, N. V. (2011)
    We report the results of flux density measurements in the extended components of thirteen giant radio galaxies, made with the RATAN-600 in the centimeter range. Supplementing them with the WENSS, NVSS and GB6 survey data ...

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