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PSR J0922+0638 (B0919+06) shows unexplained anomalous variations in the on-pulse phase, where the pulse appears to episodically move to an earlier longitude for a few tens of rotations before reverting to the usual phase for approximately…

We report the results of a blind pulsar survey carried out with the Giant Metrewave Radio Telescope (GMRT) at 325 MHz. The survey covered about 10\% of the region between Galactic longitude 45$^{\circ} < l <$ 135$^{\circ}$ and Galactic…

Providing a link between magnetars and radio pulsars, high magnetic field neutron stars are ideal targets to investigate how bursting/magnetospheric activity and braking torque variations are connected to rotational glitches. The last…

高能天体物理现象 · 物理学 2015-06-23 D. Antonopoulou , P. Weltevrede , C. M. Espinoza , A. L. Watts , S. Johnston , R. M. Shannon , M. Kerr

Fast radio bursts (FRBs) are bright, coherent, short-duration radio transients of as-yet unknown extragalactic origin. FRBs exhibit a wide variety of spectral, temporal and polarimetric properties, which can unveil clues into their emission…

高能天体物理现象 · 物理学 2021-01-06 K. Nimmo , J. W. T. Hessels , A. Keimpema , A. M. Archibald , J. M. Cordes , R. Karuppusamy , F. Kirsten , D. Z. Li , B. Marcote , Z. Paragi

Fast radio bursts (FRBs) are highly energetic radio pulses from cosmological origins. Despite an abundance of detections, their nature remains elusive. At least a subset of FRBs is expected to repeat, as the daily FRB rate surpasses that of…

高能天体物理现象 · 物理学 2020-03-04 Julian B. Muñoz , Vikram Ravi , Abraham Loeb

We have carried out high frequency radio observations of the high magnetic field pulsar PSR J1119-6127 following its recent X-ray outburst. While initial observations showed no evidence of significant radio emission, subsequent observations…

Fast radio bursts (FRBs) are millisecond-timescale radio transients, the origins of which are predominantly extragalactic and likely involve highly magnetized compact objects. FRBs undergo multipath propagation, or scattering, from electron…

高能天体物理现象 · 物理学 2022-12-14 S. K. Ocker , J. M. Cordes , S. Chatterjee , D. Li , C. H. Niu , J. W. McKee , C. J. Law , R. Anna-Thomas

Fast radio bursts (FRBs) are bright radio bursts originating at cosmological distances. Only three repeating FRBs FRB 20121102A, FRB 20190520B and FRB 20201124A among $\sim$ 60 known repeating FRBs have circular polarization. We observed…

Popular models of repeating Fast Radio Bursts (and perhaps of all Fast Radio Bursts) involve neutron stars because of their high rotational or magnetostatic energy densities. These models take one of two forms: giant but rare pulsar-like…

高能天体物理现象 · 物理学 2020-03-04 J. I. Katz

We report on the discovery and timing observations of 29 distant long-period pulsars discovered in the ongoing Arecibo PALFA pulsar survey. Following discovery with the Arecibo Telescope, confirmation and timing observations of these…

The polarization of fast radio bursts (FRBs), bright astronomical transients, contains crucial information about their environments. We report polarization measurements of five repeating FRBs, the abundant signals of which enable wide-band…

We report on radiation properties of extreme nulling pulsar J1502-5653, by analyzing the data acquired from the Parkes 64-m telescope at 1374 MHz. The radio emission from this pulsar exhibits sequences of several tens to several hundreds…

太阳与恒星天体物理 · 物理学 2015-06-05 J. Li , A. Esamdin , R. N. Manchester , M. F. Qian , H. B. Niu

Fast Radio Bursts are millisecond-duration astronomical radio pulses of unknown physical origin that appear to come from extragalactic distances. Previous follow-up observations have failed to find additional bursts at the same dispersion…

We present new results of timing and single pulse measurements for 18 radio pulsars discovered in 1993 - 1997 by the Penn State/NRL declination-strip survey conducted with the 305-m Arecibo telescope at 430 MHz. Long-term timing…

天体物理学 · 物理学 2009-11-10 W. Lewandowski , A. Wolszczan , G. Feiler , M. Konacki , T. Soltysinski

We report a detailed study of subpulse drifting in four long period pulsars. These pulsars were observed in the Meterwavelength Single-pulse Polarimetric Emission Survey and the presence of phase modulated subpulse drifting was reported in…

高能天体物理现象 · 物理学 2018-03-14 Rahul Basu , Dipanjan Mitra

We present results on the second-faintest pulsating subdwarf B (sdB) star known, RAT J0455+1305, derived from photometric data obtained in 2009. It shows both short and long periods oscillations, theoretically assigned as pressure and…

太阳与恒星天体物理 · 物理学 2015-05-27 A. S. Baran , J. T. Gilker , L. Fox-Machado , M. D. Reed , S. D. Kawaler

Fast Radio Bursts (FRBs) are enigmatic millisecond-duration radio transients of extra-galactic origin, whose underlying mechanisms and progenitors remain poorly understood. FRBs are broadly classified into two categories: repeating FRBs,…

Pulse-to-pulse intensity variations are a common property of pulsar radio emission. For some of the objects single pulses are often 10-times stronger than their average pulse. The most dramatic events are so-called giant radio pulses…

天体物理学 · 物理学 2007-05-23 A. Slowikowska , A. Jessner , G. Kanbach , B. Klein

We present an analysis of approximately 13-yr of observations of the intermittent pulsar B1931+24 to further elucidate its behaviour. We find that while the source exhibits a wide range of nulling (~4-39 d) and radio-emitting (~1-19 d)…

高能天体物理现象 · 物理学 2015-06-12 N. J. Young , B. W. Stappers , A. G. Lyne , P. Weltevrede , M. Kramer , I. Cognard

I present an empirical study of the properties of fast radio bursts (FRBs): Gigahertz-frequency, dispersed pulses of extragalactic origin. I focus my investigation on the sample of seventeen FRBs detected at the Parkes radio telescope with…

高能天体物理现象 · 物理学 2018-07-04 Vikram Ravi