Investigation of four rotating radio transients properties at 111 MHz

TL;DR

This study analyzes the pulse properties of four rotating radio transients at 111 MHz over 5.5 years, revealing diverse amplitude distributions and suggesting they may be pulsars with giant pulses.

Contribution

It provides detailed pulse amplitude distributions and S/N analysis for four RRATs, proposing they could be pulsars with giant pulses, based on long-term observational data.

Findings

Different pulse amplitude distributions among RRATs.

Detection of very strong pulses with high S/N ratios.

Evidence of emission variability and possible giant pulse nature.

Abstract

The analysis of individual pulses of four rotating radio transients (RRATs), previously discovered in a monitoring survey running for 5.5 years at the frequency of 111 MHz, is presented. At a time interval equivalent to five days of continuous observations for each RRAT, 90, 389, 206, and 157 pulses were detected in J0640+07, J1005+30, J1132+25, and J1336+33, respectively. The investigated RRATs have a different distribution of the pulses amplitude. For J0640+07 and J1132+25, the distribution is described by a single exponent over the entire range of flux densities. For J1005+30 and J1336+33, it is a lognormal function with a power law tail. For J0640+07 and J1005+30, we have detected pulses with a signal-to-noise (S/N) ratio of few hundreds. For J1132+25 and J1336+33, the S/N of the strongest pulses reaches several tens. These RRATs show strong changing of character of emission. When strengths of pulse amplitudes significantly changed, we see long intervals of absence of emission or its strong attenuation. The analysis carried out in this work shows that it is possible that all the studied RRATs are, apparently, pulsars with giant pulses.