Publication Date:
2016-07-02
Description:
We present 154 MHz Murchison Widefield Array imaging observations and variability information for a sample of pulsars. Over the declination range –80° 〈 〈 10°, we detect 17 known pulsars with mean flux density greater than 0.3 Jy. We explore the variability properties of this sample on time-scales 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 time-scales of greater than 2 min. 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 time-scales 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.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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