The Discovery of Nulling and Mode Switching Pulsars with CHIME/Pulsar
C. Ng, B. Wu, M. Ma, S. M. Ransom, A. Naidu, E. Fonseca, P. J. Boyle,, C. Brar, D. Cubranic, P. B. Demorest, D. C. Good, V. M. Kaspi, K. W. Masui,, D. Michilli, C. Patel, A. Renard, P. Scholz, I. H. Stairs, S. P. Tendulkar,, I. Tretyakov, and K. Vanderlinde
TL;DR
This paper reports the first detection of nulling and mode switching behaviors in pulsars using CHIME/Pulsar data, revealing new insights into pulsar emission variability and expanding the known pulsar phenomenology.
Contribution
It introduces a matched filtering technique to identify nulling and mode switching in pulsars, discovering new behaviors in a previously uncharacterized population.
Findings
Nulling behavior observed in five pulsars
Mode switching observed in nine pulsars
Nulling and mode switching linked to long spin periods
Abstract
The Pulsar backend of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) has monitored hundreds of known pulsars in the northern sky since Fall 2018, providing a rich data set for the study of temporal variations in pulsar emission. Using a matched filtering technique, we report, for the first time, nulling behaviour in five pulsars as well as mode switching in nine pulsars. Only one of the pulsars is observed to show both nulling and moding signals. These new nulling and mode switching pulsars appear to come from a population with relatively long spin periods, in agreement with previous findings in the literature.
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