射电天文研究室知识库

Aims. We analyze individual pulses detected from RRAT J1819-1458. Methods. From April 2007 to April 2010, we carried out observations using the Nanshan 25-m radio telescope of Urumqi Observatory at a central frequency of 1541.25 MHz. Results. We obtain a dispersion measure DM = 195.7 +/- 0.3 pc cm(-3) by analyzing all the 423 detected bursts. The tri-band pattern of arrival time residuals is confirmed by a single pulse timing analysis. Twenty-seven bimodal bursts located in the middle residual band are detected, and, profiles of two typical bimodal bursts and two individual single-peak pulses are presented. We determine the statistical properties of SNR and W-50 of bursts in different residual bands. The W50 variation with SNR shows that the shapes of bursts are quite different from each other. The cumulative probability distribution of intensity for a possible power law with index alpha = 1.6 +/- 0.2 is inferred from the number of those bursts with SNR >= 6 and high intensities.