Periodic mode changing in PSR J1048−5832. Issue 4 (4th December 2019)

• Record Type: Journal Article
• Authors: Yan, W M; Manchester, R N; Wang, N; Wen, Z G; Yuan, J P; Lee, K J; Chen, J L
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 491:Issue 4(2020)
• Page Start: 4634
• Page End: 4641
• Publication Date: 2019-12-04
• Subjects: stars: neutron -- pulsars: general -- pulsars: individual (PSR J1048−5832); Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz3399
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: By analysing the data acquired from the Parkes 64-m radio telescope at 1369 MHz, we report on the phase-stationary non-drift amplitude modulation observed in PSR J1048−5832. The high-sensitivity observations revealed that the central and trailing components of the pulse profile of this pulsar switch between a strong mode and a weak mode periodically. However, the leading component remains unchanged. Polarization properties of the strong and weak modes are investigated. Considering the similarity to mode changing, we argue that the periodic amplitude modulation in PSR J1048−5832 is periodic mode changing. The fluctuation spectral analysis showed that the modulation period is very short (∼2.1 s or 17 P 1 ), where P 1 is the rotation period of the pulsar. We find that this periodic amplitude modulation is hard to explain by existing models that account for the periodic phenomena in pulsars like sub-pulse drifting.