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

TL;DR

This study analyzes individual radio pulses from RRAT J1819-1458, revealing detailed timing, burst profiles, and statistical properties, including a potential power-law distribution of burst intensities, based on multi-year observations.

Contribution

It provides the first detailed single-pulse analysis of RRAT J1819-1458, including timing residuals, bimodal burst detection, and statistical characterization of burst properties.

Findings

Confirmed dispersion measure DM=195.7 pc cm^{-3}

Detected bimodal bursts in the residual band

Suggested a power-law distribution of burst intensities with index 1.6

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 $DM=195.7\pm0.3$ 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 $\alpha=1.6\pm0.2$ is inferred from the number of those bursts with $SNR\ge6$ and high intensities.