Journal article
A search for long-time-scale, low-frequency radio transients
T Murphy, DL Kaplan, S Croft, C Lynch, JR Callingham, K Bannister, ME Bell, N Hurley-Walker, P Hancock, J Line, A Rowlinson, E Lenc, HT Intema, P Jagannathan, RD Ekers, S Tingay, F Yuan, C Wolf, CA Onken, KS Dwarakanath Show all
Monthly Notices of the Royal Astronomical Society | OXFORD UNIV PRESS | Published : 2017
Abstract
We present a search for transient and highly variable sources at low radio frequencies (150-200 MHz) that explores long time-scales of 1-3 yr. We conducted this search by comparing the TIFR GMRT Sky Survey Alternative Data Release 1 (TGSS ADR1) and the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey catalogues. To account for the different completeness thresholds in the individual surveys, we searched for compact GLEAM sources above a flux density limit of 100 mJy that were not present in the TGSS ADR1; and also for compact TGSS ADR1 sources above a flux density limit of 200 mJy that had no counterpart in GLEAM. From a total sample of 234 333 GLEAM sources and 275..
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Awarded by Australian National University
Funding Acknowledgements
We thank David McConnell and Richard Hunstead for providing archival radio data from the ATPMN and Molonglo 408 MHz surveys, respectively. We also thank Brian Metzger for providing the model predictions for Fig. 8. This research was conducted by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020. DLK and SDC are additionally supported by NSF grant AST-1412421. This research work has used the TIFR GMRT Sky Survey (http://tgss.ncra.tifr.res.in) data products. We thank the staff of the GMRT that made these observations possible. GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. The national facility capability for SkyMapper has been funded through ARC LIEF grant LE130100104 from the Australian Research Council, awarded to the University of Sydney, the Australian National University, Swinburne University of Technology, the University of Queensland, the University of Western Australia, the University of Melbourne, Curtin University of Technology, Monash University and the Australian Astronomical Observatory. SkyMapper is owned and operated by The Australian National University's Research School of Astronomy and Astrophysics.r 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 (NCRIS), under a contract to Curtin University administered by Astronomy Australia Limited. We acknowledge the Pawsey Supercomputing Centre which is supported by the Western Australian and Australian Governments.