The central point source in G76.9+1.0 |
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Authors: | V R MARTHI J N CHENGALUR Y GUPTA G C DEWANGAN D BHATTACHARYA |
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Institution: | 1.National Centre for Radio Astrophysics,P. B. 3, Ganeshkhind, Pune University Campus,Pune,India;2.Inter-University Centre for Astronomy and Astrophysics,P. B. 4, Ganeshkhind, Pune University Campus,Pune,India |
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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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