Strong pulses detected from rotating radio transient J1819 − 1458

¹ Urumqi Observatory, NAOC, 40-5 South Beijing Road, Urumqi 830011, P.R. China
e-mail: aliyi@uao.ac.cn
² Graduate University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, P.R. China
³ School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, P.R. China

Received: 19 October 2010
Accepted: 18 March 2011

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 W₅₀ 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.