(ORDO NEWS) — Astronomers have announced the discovery of four new pulsars by the Giant Metrewave Radio Telescope (GMRT) as part of the GMRT High Resolution Southern Sky (GHHRSS) Survey.
A team of astronomers led by Shubham Singh of the Tata Institute for Basic Research in Pune, India, has discovered four new pulsars using the fast folding algorithm (FFA) to search. This method is sensitive to signals with long periods and short duty cycles.
The discovered pulsars have been designated as J1245-52, J1447-50, J1810-42 and J1936-30. They have rotation periods from 532.2 to 1675.8 milliseconds, and their dispersion indices are in the range of 42.2–107.8 pc/cm3. Flux density values are in the range from 0.4 to 1.5 mJy.
Scientists have determined that J1936-30 is a narrow duty cycle pulsar, with a nulling limit of about 90%.
Subsequent observations of this pulsar showed that it exhibits burst phases (when radiation is visible) and nulling phases lasting from several minutes to several tens of minutes.
J1245-52 and J1447-50 are also among the pulsars with the lowest duty cycles of the general population.
The researchers noted that this discovery demonstrates the ability of the FFA method to detect low duty cycle pulsars, which can be missed when searching using the Fast Fourier Transform (FFT) method.
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