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The central point source in G76.9+1.0

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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.

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Authors and Affiliations

  1. National Centre for Radio Astrophysics, P. B. 3, Ganeshkhind, Pune University Campus, Pune, 411 007, India

    V. R. MARTHI, J. N. CHENGALUR & Y. GUPTA

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

    G. C. DEWANGAN & D. BHATTACHARYA

Authors
  1. V. R. MARTHI
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  2. J. N. CHENGALUR
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  3. Y. GUPTA
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  4. G. C. DEWANGAN
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  5. D. BHATTACHARYA
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Correspondence to V. R. MARTHI.

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MARTHI, V.R., CHENGALUR, J.N., GUPTA, Y. et al. The central point source in G76.9+1.0. J Astrophys Astron 32, 451–455 (2011). https://doi.org/10.1007/s12036-011-9104-6

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  • DOI: https://doi.org/10.1007/s12036-011-9104-6

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