Discovery of a Periodic Radio Signal from the Radio-quiet Gamma-ray Pulsar PSR J0359+5414 Using FAST
ATel #16875; Ruobin Ding (Beijing Normal University), Shuo Cao (Beijing Normal University), Shuangqiang Wang(XAO, CAS, CSIRO, Australia), Ralph P. Eatough (NAOC), Tingting Lin (Zhejiang Shuren University), Yujie Lian (Beijing Normal University), Lei Qian (NAOC), Haiyan Zhang (NAOC), Zhe Li (IHEP, CAS). Renxin Xu (Peking University), Shunshun Cao (Peking University), Zhichen Pan (NAOC)
on 25 Oct 2024; 15:02 UT
Credential Certification: Shuo Cao (caoshuo@bnu.edu.cn)
We report the detection of a periodic radio signal from the radio-quiet gamma-ray pulsar PSR J0359 +5414, using the Five-hundred-meter Aperture Spherical radio Telescope (FAST; Nan et al., 2011, IJMPD, 20, 989).
This pulsar is located at RA = 03h59m26.01s, DEC = +54°14’55.7″ (J2000), with a rotational period of 79.42 ms determined in the gamma-ray band. It has also been listed as 1LHAASO J0359+5406 in the first LHAASO catalog ( Cao et al., 2024, ApJS, 271, 25) as a very-high energy extended gamma-ray source, covering an energy range from 1 to 100 TeV.
The observations were carried out with FAST on September 3rd, 2022, with a total integration time of 6600 s. The data were recorded with 8-bit sampling and the observing band was divided into 4096 frequency channels, each with a width of 0.122 MHz. The power spectra were summed with a time resolution of 49.152 µs.
Data processing was performed using the pulsar software tools DSPSR and PSRCHIVE. The data were folded according to the ephemeris from the Large Area Telescope (LAT) of the Fermi satellite ( Clark et al., 2017, ApJ, 834, 106). Given the unknown dispersion measure (DM), we initially estimated a DM of 149 pc cm−3 based on the YMW16 electron density model ( Yao, Manchester & Wang, 2017, ApJ, 835, 29), assuming a distance of 3.45 kpc ( Zyuzin et al., 2018, MNRAS, 476, 2177). With the PSRCHIVE routine PDMP, a search was then conducted over a broad DM range from 0 to 500 pc cm−3, significantly exceeding the range predicted by the YMW16 model.
Our results show that the period of the radio signal is consistent with that obtained in gamma-ray. The measured DM value of the pulsar is 89.13 pc cm−3, with an estimated average flux density of only ∼ 6 µJy.
