Strong pulses detected from a rotating radio transient J1819$-$1458

Abstract

We analyze individual pulses detected from RRAT J1819$-$1458. 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. We obtain a dispersion measure $DM=195.7\pm 0.3$ 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 W${}_{50}$ 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 $\alpha =1.6\pm 0.2$ is inferred from the number of those bursts with $SNR\ge 6$ and high intensities.

arXiv comment6 pages, 8 figures, 1 table, accepted for publication in A&A

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