Strong pulses detected from rotating radio transient J1819 - 1458

Abstract

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 α = 1.6 ± 0.2 is inferred from the number of those bursts with SNR ≥ 6 and high intensities. © 2011 ESO.