Time-domain and spectral properties of pulsars at 154 MHz

Bell, M. E. ; Murphy, Tara ; Johnston, S. ; Kaplan, D. L. ; Croft, S. ; Hancock, P. ; Callingham, J. R. ; Zic, A. ; Dobie, D. ; Swiggum, J. K. ; Rowlinson, A. ; Hurley-Walker, N. ; Offringa, A. R. ; Bernardi, G. ; Bowman, J. D. ; Briggs, F. ; Cappallo, R. J. ; Deshpande, A. A. ; Gaensler, B. M. ; Greenhill, L. J. ; Hazelton, B. J. ; Johnston-Hollitt, M. ; Lonsdale, C. J. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Oberoi, D. ; Ord, S. M. ; Prabu, T. ; Shankar, N. Udaya ; Srivani, K. S. ; Subrahmanyan, R. ; Tingay, S. J. ; Wayth, R. B. ; Webster, R. L. ; Williams, A. ; Williams, C. L. (2016) Time-domain and spectral properties of pulsars at 154 MHz Monthly Notices of the Royal Astronomical Society, 461 (1). pp. 908-921. ISSN 0035-8711

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Official URL: https://academic.oup.com/mnras/article-abstract/46...

Related URL: http://dx.doi.org/10.1093/mnras/stw1293

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.

Item Type:Article
Source:Copyright of this article belongs to Royal Astronomical Society.
Keywords:Pulsars: General; Radio Continuum: Stars
ID Code:114234
Deposited On:21 May 2018 06:54
Last Modified:21 May 2018 06:54

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