Study Reveals Unique Emission Properties in Long-period CRAFT Pulsar

Chinese Academy of Sciences

Ph.D. student Habtamu Menberu Tedila and his collaborators from the Xinjiang Astronomical Observatory (XAO) of the Chinese Academy of Sciences (CAS) have revealed the unique emission properties in a long-period CRAFT pulsar J1900+4221.

The study was published in The Astrophysical Journal.

Radio pulsars are well known for exceptionally regular emissions due to the stability of their rotation. However, large changes in the pulse shape and flux variations are detected at the individual pulses.

A relatively long-period pulsar PSR J1900+4221 with a rotational period of 4.34 s was discovered during the Commensal Radio Astronomy FAST Survey (CRAFTS) pilot scans.

Based on data obtained from the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), the researchers conducted a single-pulse study of the emission from the pulsar.

Using single-pulse energy analysis, they investigated the emission variation in the leading and trailing components. The single-pulse sequence of this pulsar revealed different emission features such as nulling, weak, regular pulses, and occasional bright pulses.

The results showed that emission from the two components was unique, and they exhibited a moderate correlation.

The researchers also found that the null fraction was about 22.2% ± 1.1% for this pulsar. Considering the long rotational period of the pulsar, such nulling value did not seem to show a strong correlation with its age or the rotation period.

In addition, the “movement” of subpulses across the profile was also detected in this pulsar, and the phenomenon was more diverse than other CRAFTS-discovered pulsars.

/Public Release. This material from the originating organization/author(s) may be of a point-in-time nature, edited for clarity, style and length. The views and opinions expressed are those of the author(s).View in full here.