Time-domain and spectral properties of pulsars at 154 MHz

Abstract

We present 154 MHz Murchison Widefield Array imaging observations and variability information for a sample of pulsars. Over the declination range $-80^{\circ }<\delta <10^{\circ }$ we detect 17 known pulsars with mean flux density greater than 0.3 Jy. We explore the variability properties of this sample on timescales of minutes to years. For three of these pulsars, PSR J0953+0755, PSR J0437-4715 and PSR J0630-2834 we observe interstellar scintillation and variability on timescales of greater than 2 minutes. One further pulsar, PSR J0034-0721, showed significant variability, the physical origins of which are difficult to determine. The dynamic spectra for PSR J0953+0755 and PSR J0437-4715 show discrete time and frequency structure consistent with diffractive interstellar scintillation and we present the scintillation bandwidth and timescales from these observations. The remaining pulsars within our sample were statistically non-variable. We also explore the spectral properties of this sample and find spectral curvature in pulsars PSR J0835-4510, PSR J1752-2806 and PSR J0437-4715.

References in corpus (41)

• LOFAR: The LOw-Frequency ARray
• The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• Birth and Evolution of Isolated Radio Pulsars
• The Parkes multibeam pulsar survey: VI. Discovery and timing of 142 pulsars and a Galactic population analysis
• A periodically active pulsar giving insight into magnetospheric physics
• NE2001.I. A New Model for the Galactic Distribution of Free Electrons and its Fluctuations
• The VLA Low-frequency Sky Survey
• The Murchison Widefield Array: Design Overview
• A morphological algorithm for improving radio-frequency interference detection
• GLEAM: The GaLactic and Extragalactic All-sky MWA survey
• The Very Large Array Low-frequency Sky Survey Redux (VLSSr)
• The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
• Compact continuum source-finding for next generation radio surveys
• Pulsar spectra of radio emission
• Observing pulsars and fast transients with LOFAR
• The pulsar spectral index distribution
• Radio scintillation of gamma-ray-burst afterglows
• The low-frequency environment of the Murchison Widefield Array: radio-frequency interference analysis and mitigation
• A Study of Multi-frequency Polarization Pulse Profiles of Millisecond Pulsars
• New pulsar rotation measures and the Galactic magnetic field
• A LOFAR census of millisecond pulsars
• High time-resolution observations of the Vela pulsar
• PsrPopPy: An open-source package for pulsar population simulations
• Long-Term Scintillation Studies of Pulsars: I. Observations and Basic Results
• Broadband Spectral Modeling of the Extreme Gigahertz-Peaked Spectrum Radio Source PKS B0008-421
• Characterization of a Low-Frequency Radio Astronomy Prototype Array in Western Australia
• The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14,110 Compact Radio Sources over 6,100 Square Degrees
• Pulsars with gigahertz-peaked spectra
• Long-Term Scintillation Studies of Pulsars: II. Refractive Effects and the Spectrum of Plasma Density Fluctuations
• Low-Frequency Spectral Turn-Overs in Millisecond Pulsars Studied from Imaging Observations
• 17 and 24 GHz observations of southern pulsars
• A pilot ASKAP survey of radio transient events in the region around the intermittent pulsar PSR J1107-5907
• The low-frequency characteristics of PSR J0437-4715 observed with the Murchison Widefield Array
• Giant pulse emission from PSR B0950+08
• Quantifying ionospheric effects on time-domain astrophysics with the Murchison Widefield Array
• Observations of Giant Pulses from Pulsar PSR B0950+08 using LWA1
• The Microarcsecond Sky and Cosmic Turbulence
• Simultaneous Observations of Giant Pulses from the Crab Pulsar, with the Murchison Widefield Array and Parkes Radio Telescope: Implications for the Giant Pulse Emission Mechanism
• Simultaneous Observations of Giant Pulses from Pulsar PSR B0950+08 at 42 MHz and 74 MHz

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• Discovery and follow-up of a quasiperiodically nulling and sub-pulse drifting pulsar with the Murchison Widefield Array
• A Multifrequency Census of 100 Pulsars below 100 MHz with LWA: A Systematic Study of Flux Density, Spectra, Timing, Dispersion, Polarization, and Its Variation from a Decade of Observations
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• Variations in the Radiation Intensity of Pulsar B0950+08: Nine Years of Monitoring at 110 MHz
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