2020/10/19 by Rahul Basu, Dipanjan Mitra, George I. Melikidze · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Flux (metallurgy) #Gamma-ray bursts and supernovae #Giant Metrewave Radio Telescope #Neutron star #Pulsar #Pulsars and Gravitational Waves Research #Radio astronomy #Radio telescope #Telescope #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/abc3c7
published in The Astrophysical Journal 905(1), 30 (IOP Publishing) · 12 pages, 5 figures, to be published in ApJ
arxiv created 2020/10/19 · openalex created_date 2020/10/22 · openalex publication_date 2020/12/01 · arxiv updated 2020/12/16 · openalex updated_date 2026/08/06
Abstract We have revisited the problem of off-pulse emission in pulsars, where a detailed search for the presence of low-level radio emission outside the pulse window is carried out. The presence of off-pulse emission was earlier reported in two long-period pulsars, PSR B0525+21 and B2046–16, at frequencies below 1 GHz using the Giant Metrewave Radio Telescope (GMRT). However, subsequent studies did not detect off-pulse emission from these pulsars at higher radio frequencies (>1 GHz). We have carefully inspected the analysis scheme used in the earlier detections and found an anomaly with data editing routines used, which resulted in leakage of signal from the on-pulse to the off-pulse region. We show that the earlier detections from PSR B0525+21 and B2046–16 were a result of this leakage. The above analysis scheme has been modified and offline gating has been used to search for off-pulse emission in 21 long-period pulsars ( P > 1.2 s) at different observing frequencies of GMRT. The presence of low-level off-pulse emission of the peak flux 0.5 mJy was detected in the brightest pulsar in this list, PSR 0B0628–28, with an off-pulse to average pulsar flux ratio of 0.25%. We suggest that coherent radio emission resulting due to cyclotron resonance near the light cylinder can be a possible source for the off-pulse emission in this pulsar.