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|Title:||Time-domain and spectral properties of pulsars at 154 MHz|
Udaya Shankar, N.
|Publisher:||Oxford University Press for The Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2016, Vol. 461, p 908-921|
|Abstract:||We present 154 MHz Murchison Widefield Array imaging observations and variability information for a sample of pulsars. Over the declination range −80° < δ < 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.|
1365-2966 - (online)
|Copyright:||2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society|
|Appears in Collections:||Research Papers (A&A)|
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