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2 results

  • First Results from Simultaneous Dual Frequency Observations of Pulsars

  • Y. Gupta, P. Gothoskar, N.D. Ramesh Bhat
  • Journal:
    Symposium - International Astronomical Union / Volume 199 / 2002
    Published online by Cambridge University Press:
    26 May 2016, pp. 369-372
    Print publication:
    2002
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  • One of the unique capabilities of the GMRT is the facility for simultaneous multi-frequency observations of pulsars. We have initiated such observations with the aims of (i) studying frequency dependence of pulsar emission, (ii) accurate estimates of pulsar dispersion measure and its variations and (iii) multi-frequency interstellar scintillation studies. Here we present some results from the ongoing dual frequency observations of pulsars.

  • Interstellar Scintillation Studies of Pulsars and Distribution of Scattering Plasma in the Local Interstellar Medium

  • N.D. Ramesh Bhat, Yashwant Gupta, A. Pramesh Rao, P.B. Preethi
  • Journal:
    International Astronomical Union Colloquium / Volume 182 / 2001
    Published online by Cambridge University Press:
    12 April 2016, pp. 171-174
    Print publication:
    2001
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  • Pulsar scintillation measurements from the Ooty Radio Telescope (ORT) are used to investigate the distribution of scattering in the Local Interstellar Medium (LISM; region of ≲ 1 kpc of the Sun), specifically the region in and around the Local Bubble. A 3-component model, where the Solar neighborhood is surrounded by a shell of enhanced plasma turbulence, is proposed for the LISM. Further, the Ooty data, along with those from Parkes and other telescopes are used for investigating the distribution of scattering towards the nearby Loop I Superbubble.