GHRSS survey finds four new pulsars

Tomasz Nowakowski is a member of the physics.org community.

The detection of four new pulsars using the Giant Metrewave Radio Telescope is reported by Astronomers. A research paper detailing the finding was published in October.

Nuclear stars emit a beam of radiation. They are usually detected in the form of a short burst of radio emission.

Four new pulsars have been discovered by a team of astronomer led by Shubham Singh of the TATA Institute of Fundamental Research in India. FFA has a better sensitivity to find signals with long periods and short duty cycles. The team processed the data from the survey.

In the GMRT High Resolution Southern Sky (GHRSS) survey, we are looking for isolated pulsars in a range of 100 ms to 100 s. The results of the data were presented in the paper and four new discoveries were made.

The newly discovered pulsars are called J125-52, J1447-50, J1810-42 and J1936-31. They have spin periods between 532.2 and 1,675.8 milliseconds. The values were between 0.4 and 1.5 mJy.

The J1936-30 is a nulling pulsar with an extreme nulling fraction. In a pulsar, pulse nulling is a phenomenon in which the pulse energy suddenly drops to zero or near zero and then just suddenly returns to its normal state.

The astronomer found that it exhibits regular nulling in the discovery time. When the emission is seen, the burst phases and null phases last between a few minutes to a few tens of minutes.

J1245-50 and J1447-50 are among the smallest duty cycle pulsars. The ability of the FFA search to recover small duty cycle pulsars that could be missed is demonstrated by this finding.

There is a bias against long period and small duty cycle pulsars in the FFT-based search method. There is a chance of missing the population of long period and small duty cycle pulsars since most of them have been found. The FFA search can be used to recover the missing population, according to the authors of the paper.

There is more information about the GMRT High Resolution Southern Sky Survey for pulsars and Transients. There is a book titled "arxiv.2210.16650."

Journal information: arXiv

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