The emission and scintillation properties of RRAT J2325−0530 at 154 MHz and 1.4 GHz

Abstract

Rotating Radio Transients (RRATs) represent a relatively new class of pulsar, primarily characterised by their sporadic bursting emission of single pulses on time scales of minutes to hours. In addition to the difficulty involved in detecting these objects, low-frequency (< 300 MHz) observations of RRATs are sparse, which makes understanding their broadband emission properties in the context of the normal pulsar population problematic. Here, we present the simultaneous detection of RRAT J2325−0530 using the Murchison Widefield Array (154 MHz) and Parkes radio telescope (1.4 GHz). On a single-pulse basis, we produce the first polarimetric profile of this pulsar, measure the spectral index (α = −2.2 ± 0.1), pulse energy distributions, and present the pulse rates in the context of detections in previous epochs. We find that the distribution of time between subsequent pulses is consistent with a Poisson process and find no evidence of clustering over the ∼ 1.5 hr observations. Finally, we are able to quantify the scintillation properties of RRAT J2325−0530 at 1.4 GHz, where the single pulses are modulated substantially across the observing bandwidth, and show that this characterisation is feasible even with irregular time sampling as a consequence of the sporadic emission behaviour.

Revisiting Pushchino RRAT search using neural network

“…Earlier in Logvinenko (2020), RRATs have already been noted, in which the average time between pulses exceeded 10 hours. It is known that the appearance of RRAT pulses can obey the Poisson distribution (Meyers, 2019). In the paper Smirnova (2022) it was shown that the distribution of nullings (i.e., the duration of intervals without pulses) for some RRATs obeys an exponential law.…”

Investigation of four rotating radio transients properties at 111 MHz

“…There is only one investigation with simultaneous observations RRAT at meter and decimeter wavelength (Meyers, 2019). They find that the single-pulse amplitude distribution is a truncated exponential at 150 MHz and a power low at 1400 MHz.…”

“…Other studies of the pulse amplitude distribution in more than two dozen RRATs discovered in the decimeter wavelength range (Cui et al, 2017, Mickaliger, 2018, Shapiro-Albert, 2018 showed a lognormal or lognormal with power law tail distribution. Meyers (2019) estimated the pulse energy distribution for J2325-0530 at 150 MHz and 1400 MHz but because of small sample of single pulses they were unable to drow concrete conclusions. Since our sample is small and does not have observations at higher frequences, it is impossible to conclude that the distribution of the pulse amplitude may depend on the frequency of observations for all RRATs.…”

Science with the Murchison Widefield Array: Phase I results and Phase II opportunities

“…giant pulses), or switching emission states (e.g. Kramer et al 2006a;Lorimer et al 2012;Young et al, 2014;Meyers et al 2017Meyers et al , 2018Meyers et al , 2019. Such emission occurs on timescales of seconds to months, and the pulsars which exhibit such types of emission pose a major challenge to our understanding of the underlying physics that govern the radio emission mechanism.…”