A Single-pulse Study of the Subpulse Drifter PSR J1631+1252 Discovered at FAST

Abstract

We report on the pulse-to-pulse energy distribution and longitude-resolved modulation properties of PSR J1631+1252 discovered by the Five-hundred-meter Aperture Spherical radio Telescope. Our analysis made use of the data acquired at 1250 MHz from the follow-up timing observations that lasted over a year. PSR J1631+1252 has a rotational period of ∼0.310 s, and a dispersion measure of ∼32.73 pc cm−3. The energy distribution is well described by a lognormal distribution, the parameters of which do not vary with time. We show that large modulation occurs across the bridge emission of the pulse profile, with sporadic bright bursts at the leading emission region. The fluctuation spectral analysis reveals the existence of subpulse drifting in the leading component with vertical spacing between the drift bands of 3.28 ± 0.08 pulse periods between consecutive drift bands. Possible physical mechanisms for subpulse drifting are discussed.

Subpulse Drifting of PSR J1110–5637

“…The drift rate of these pulsars is Δf = 0. At present, the mode changing, nulling and drifting subpulse are detected in hundreds of pulsars (Wang et al 2007;Weltevrede et al 2007;Basu et al 2019a;Wang et al 2021;Wen et al 2022). The observation shows that there may be some connection between these three famous pulsar emission variations.…”

An RFI Mitigation Pipeline for CRAFTS Multi-beam Data Based on Signal Cross-Correlation Function and SumThreshold Algorithm

“…The rapid growth of pulsar discoveries from CRAFTS promotes the international cooperation between CRAFTS and other telescopes, e.g., Parkes, Effelsberg, Green Bank radio telescopes, Arecibo telescope, and Fermi-LAT gamma-ray telescope, for pulsar follow-up and timing studies (Cameron et al 2020;Wang et al 2021aWang et al , 2021bCruces et al 2021;Wen et al 2022;Miao et al 2023). More than 170 new pulsars have been discovered, 6 including 40 millisecond pulsars (Wang et al 2021a;Miao et al 2023), long-period pulsars (Zhang et al 2019;Tedila et al 2022).…”

Single-pulse Emission Variation of Two Pulsars Discovered by FAST

“…However, it is found that some pulsars exhibit unregular single-pulse emission such as fluctuation in pulse width, pulse phase and pulse intensity (Wen et al 2016). The phenomenon of singlepulse emission variation in pulsars specifically includes nulling (Backer 1970;Ritchings 1976;Wang et al 2007;Gajjar et al 2012;Wen et al 2016), mode changing (Bartel & Hankins 1982;Wang et al 2007;Wen et al 2020;Yan et al 2020), giant pulses (Staelin & Reifenstein 1968;Hankins et al 2003;Kuzmin & Ershov 2006;Sun et al 2021), subpulse drifting (Drake & Craft 1968;Weltevrede et al 2006Weltevrede et al , 2007Basu et al 2016Basu et al , 2019Wen et al 2022) and so on. The investigation of single-pulse emission variation will help us to reveal the physical mechanism of emission for radio pulsars.…”

“…The millisecond pulsar PSR J0621+1002 displays periodic pulse intensity modulation (Wang et al 2021a). Wen et al (2022) investigated the single-pulse energy distribution and sub-pulse drifting characteristics of PSR J1631+1252. A study of the newly identified pulsar PSR J1900+4221 discovered by FAST shows that it has an NF of 22% and manifests the mode changing phenomenon (Tedila et al 2022).…”