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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/032/04/0451-0455

    • Keywords

       

      Supernova remnants: pulsars: radiation mechanisms.

    • Abstract

       

      We describe the serendipitous discovery of a very steep-spectrum radio point source in low-frequency Giant Metrewave Radio Telescope (GMRT) images of the supernova remnant (SNR) G76.9+1.0. The steep spectrum, as well as the location of the point source near the centre of this SNR confirm that this indeed is the pulsar J2022+3842. Archival Chandra X-ray data shows a point source coincident with the radio point source. However, no pulsed radio emission was detected despite deep searches at 610 MHz and 1160 MHz – which can be understood to be due to temporal broadening of the pulses. Weak pulsed emission has indeed been seen at 2 GHz with the Green Bank Telescope (GBT), establishing the fact that scattering is responsible for its non-detection at low radio frequencies. We underline the usefulness of low-frequency radio imaging as a good technique to prospect for pulsar candidates.

    • Author Affiliations

       

      V. R. Marthi1 J. N. Chengalur1 Y. Gupta1 G. C. Dewangan2 D. Bhattacharya2

      1. National Centre for Radio Astrophysics, P. B. 3, Ganeshkhind, Pune University Campus, Pune 411 007, India.
      2. Inter-University Centre for Astronomy and Astrophysics, P. B. 4, Ganeshkhind, Pune University Campus, Pune 411 007, India.

    • Dates

       
      Published
      December 2011

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      Posted on January 27, 2016

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