Journal article

Time-domain and spectral properties of pulsars at 154 MHz

ME Bell, Tara Murphy, S Johnston, DL Kaplan, S Croft, P Hancock, JR Callingham, A Zic, D Dobie, JK Swiggum, A Rowlinson, N Hurley-Walker, AR Offringa, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande, BM Gaensler, LJ Greenhill Show all

Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2016

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 showdiscrete time and ..

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University of Melbourne Researchers

Grants

Awarded by NSF Physics Frontier Center


Awarded by US National Science Foundation


Awarded by Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO)


Awarded by Direct For Mathematical & Physical Scien


Awarded by Division Of Astronomical Sciences


Funding Acknowledgements

This scientific work makes use of the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. Support for the operation of the MWA is provided by the Australian Government Department of Industry and Science and Department of Education (National Collaborative Research Infrastructure Strategy: NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the iVEC Petabyte Data Store and the Initiative in Innovative Computing and the CUDA Center for Excellence sponsored by NVIDIA at Harvard University. JKS is supported from NSF Physics Frontier Center award number 1430284. DLK and SDC acknowledge support from the US National Science Foundation (grant AST-1412421). Parts of this research were conducted by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. This work was supported by the Flagship Allocation Scheme of the NCI National Facility at the ANU.