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Browsing by Author "Gangadhara, R. T"

Browsing by Author "Gangadhara, R. T"

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  • Radio Emission by Particles Accelerated in Pulsar Magnetosphere 
    Thomas, R. M. C; Gangadhara, R. T (Astronomical Society of India, 2003)
    We present a relativistic model of pulsar radio emission by plasma accelerated along the rotating magnetic field lines projected on to a 2D plane perpendicular to the rotation axis. We have derived the expression for the ...
  • Radio emission by particles due to pulsar spin 
    Thomas, R. M. C; Gangadhara, R. T (EDP Sciences, 2005-07)
    We present a relativistic model for the motion of charged particles in rotating magnetic field lines projected onto a plane perpendicular to the rotation axis. By making an approximation that the projected field lines are ...
  • Radio wave heating of astrophysical plasmas 
    Gangadhara, R. T; Krishan, V (Indian Academy of Sciences, 1990-12)
    The coherent plasma process, parametric decay instability (PDI), has been applied to a homogeneous and unmagnetized plasma. These instabilities cause anomalous absorption of strong electromagnetic radiation under specific ...
  • 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 ...
  • Reception of Radio Waves from Pulsars 
    Gangadhara, R. T (International Astronomical Union, 2004)
    The beamed emission by relativistic sources moving along the magnetic dipolar field lines occurs in the direction of tangents to the field lines. To receive such a beamed radiation, the line of sight must align with the ...
  • Relativistic Model on Pulsar Radio Emission and Polarization 
    Dinesh Kumar; Gangadhara, R. T (IOP Publishing, 2012-02-20)
    We have developed a relativistic model for pulsar radio emission and polarization by taking into account a detailed geometry of emission region, rotation, and modulation. The sparks activity on the polar cap leads to plasma ...
  • The role of Compton and Raman scattering in the quasar continuum 
    Gangadhara, R. T; Krishan, V (Blackwell Publishing, 1992-05)
    There are three ways in which an electromagnetic wave can undergo scattering in a plasma: (1) when the scattering of radiation occurs by a single electron, it is called Compton Scattering; (2) if it occurs by a longitudinal ...
  • The Role of Rotation and Polar-Cap currents on Pulsar Radio Emission and Polarization 
    Dinesh Kumar; Gangadhara, R. T (IOP Publishing, 2013-06-01)
    Perturbations such as rotation and polar-cap current (PC-current) have been believed to greatly affect the pulsar radio emission and polarization. The two effects have not been considered simultaneously in the literature; ...
  • Role of time resolution on polarization of pulsar radiation 
    Gangadhara, R. T; Xilouris, K. M; von Hoensbroech, A; Kramer, M; Jessner, A; Wielebinski, R (The European Southern Observatory, 1999-02)
    The role of orthogonal polarization modes in pulsar emission is re-examined in view of polarization data of high time resolution. Individual pulse data of PSR B1133+16 at 1.41 GHz, obtained with time resolutions of 1160, ...
  • Stimulated Raman scattering of water maser lines in astrophysical plasmas 
    Gangadhara, R. T; Deguchi, S; Lesch, H (American Institute of Physics, 1999-10)
    Radiative transfer equations are derived and solved for the stimulated Raman scattering of water maser lines in the astrophysical plasmas with electrons density of about 106 - 107cm-3. In stimulated Raman scattering, the ...
  • Understanding pulsar emission profiles from geometry and rotation effects 
    Thomas, R. M. C; Gupta, Y; Gangadhara, R. T (Astronomical Society of the Pacific, 2009-09)
    We have developed a method to locate the possible emission regions in pulsar magnetospheres, taking into account detailed effects of geometry and rotation of the neutron star. Using curvature radiation formulation, we ...
  • Understanding the effects of geometry and rotation on pulsar intensity profiles 
    Thomas, R. M. C; Gupta, Y; Gangadhara, R. T (Wiley-Blackwell, 2010-08-01)
    We have developed a method to compute the possible distribution of radio emission regions in a typical pulsar magnetosphere, taking into account the viewing geometry and rotational effects of the neutron star. Our method ...
  • Understanding the Radio Emission Geometry of Multiple-Component Radio Pulsars from Retardation and Aberration Effects 
    Gupta, Y; Gangadhara, R. T (The American Astronomical Society, 2003-02)
    We have conducted a detailed analysis of the emission geometry of a handful of radio pulsars that have prominent, multiple-component profiles at meter wavelengths. From careful determination of the total number of emission ...
  • Understanding the Radio Emission Geometry of PSR B0329+54 
    Gangadhara, R. T; Gupta, Y (American Astronomical Society, 2001-07)
    We have analyzed high-quality single-pulse data of PSR B0329+54 at 325 and 606 MHz to study the structure of the emission beam. Using the ``window-threshold technique,'' which is suitable for detecting weak emission ...
  • Window-threshold technique for detecting pulse components 
    Gangadhara, R. T (Astronomical Society of India, 2000)
    We have analysed high-quality single pulse data of PSR B0329+54 at 606 MHz to study the structure of the emission beam. In order to unambiguously detect weak emission components in the integrated pulse profile, we have ...

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