An Observational Study Of The Strong Single Pulse From Pulsars

This paper mainly introduced the project accomplished during my graduate study. These works included Single pulse search method and an observational study of the strong single pulses from PSR J0034-0721.In Chapter 2, the single pulse searching method is introduced. Selecting an appropriate searching method to detect the known pulsars or new pulsars is very important. In this chapter some general issues are described which must be considered in designing and carrying out any search for pulsars. Then outline the steps of the single pulse searching method.In Chapter 3, the analysis results of strong single pulses from PSR J0034-0721 are reported. Observations were performed from 2009 November 19 to 2010 January 13 with the Urumqi 25-m radio telescope. A total of 8 hours of data were collected in four observational runs. Using the single pulse searching method, a total of 353 single pulses are detected in 8 hours of observing. The signal-to-noise ratios of the detected pulses range from 5 to 11.5. The peak fluxes of such pulses are 17 to 39 times that of the peak of the average pulse. The strongest pulse has a flux of 9.43Jy. The cumulative distribution of the signal-to-noise ratios of these strong pulses has roughly a power-law distribution with a slope of 4.4±0.5. The W50 of these pulses range from 1.5 ms to 13.1 ms, with an average value of 6.5 ms. At 1.54 GHz the average pulse profile revealed only one component. And the distribution of the strong pulses shows that they may be concentrated on two different phase regions. Most of the strong pulses from this pulsar detected at 1.54 GHz are clustered in a narrow region close to the peak of the AP. More than ten strong pulses, with RSN ratios greater than 6 were detected in a phase range that is leading the phase of AP's peak by 22.5 ms to 40 ms. The distribution of the strong pulses suggests that they may come from two different emission regions. At 1.54 GHz, the intrinsic widths and strengths of the pulses imply that the strong pulses detected from PSR J0034-0721 may be one kind of special strong pulses which are different from the normal single pulses of the pulsar and also different from the typical GP from other pulsars.