Abstract
We report analysis of an 8-h observation of PSR B0943+10 at 325 MHz performed at the Giant Metrewave Radio Telescope (GMRT) in India. B0943+10 is well known for displaying regular subpulse drifting and two emission modes. We investigate the modal behaviour of B0943+10. By reconstructing an entire ‘B’ mode from two consecutive ‘B’ modes, we estimate that the pulsar spends roughly 7.5 h in the ‘B’ mode and about 2.2 h in the ‘Q’ mode, on average. Although the pulsar can switch modes within one pulse, the subpulse drift rate changes with a characteristic time of 1.2 h over the course of a ‘B’ mode. Under the subbeam carousel model we find the drift rate changes are produced by a 10 per cent increase in the average number of subbeams and a 16 per cent increase in the carousel circulation time. We speculate that under the partially screened gap model the increase in circulation time should be related to a small increase in the neutron star surface temperature.
Highlights
Pulsar B0943+10 is well known as a paradigm example of moding and subpulse drifting in pulsars
During the ‘Q’ mode, B0943+10 grows dimmer and a precursor component (PC) appears whose peak precedes the peak of the main pulse (MP) by some 50◦, as discovered in Backus, Mitra & Rankin (2010)
The voltage signals were subsequently sampled at the Nyquist rate and processed through a digital receiver system consisting of a correlator, the Giant Metrewave Radio Telescope (GMRT) Array Combiner (GAC), and a pulsar backend
Summary
Pulsar B0943+10 is well known as a paradigm example of moding and subpulse drifting in pulsars. During the ‘Q’ mode, B0943+10 grows dimmer and a precursor component (PC) appears whose peak precedes the peak of the main pulse (MP) by some 50◦, as discovered in Backus, Mitra & Rankin (2010) The papers in this series have investigated at length the dynamic behaviours of B0943+10. Paper IV argued that there are gradual changes in f 3 over the course of a ‘B’-mode interval with the remarkably long time-scale of 1.2 h. This series has investigated whether B0943+10’s highly regular drift modulation might be understood on the basis of the subbeam carousel model (CM).
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