Time-domain and spectral properties of pulsars at 154 MHz
Date Issued
2016
Author(s)
Bell, M. E.
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Murphy, Tara
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Johnston, S.
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Kaplan, D. L.
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Croft, S.
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Hancock, P.
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Callingham, J. R.
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Zic, A.
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Dobie, D.
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Swiggum, J. K.
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Rowlinson, A.
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Hurley-Walker, N.
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Offringa, A. R.
•
•
Bowman, J. D.
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Briggs, F.
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Cappallo, R. J.
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Deshpande, A. A.
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Gaensler, B. M.
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Greenhill, L. J.
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Hazelton, B. J.
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Johnston-Hollitt, M.
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Lonsdale, C. J.
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McWhirter, S. R.
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Mitchell, D. A.
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Morales, M. F.
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Morgan, E.
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Oberoi, D.
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Ord, S. M.
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Prabu, T.
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Shankar, N. Udaya
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Srivani, K. S.
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Subrahmanyan, R.
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Tingay, S. J.
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Wayth, R. B.
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Webster, R. L.
•
Williams, A.
•
Williams, C. L.
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.
Volume
461
Issue
1
Start page
908
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.461..908B
Rights
open.access
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