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http://hdl.handle.net/20.500.12386/26337
Titolo: | Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array | Autori: | Rowlinson, A. Bell, M. E. Murphy, T. Trott, C. M. Hurley-Walker, N. Johnston, S. Tingay, S. J. Kaplan, D. L. Carbone, D. Hancock, P. J. Feng, L. Offringa, A. R. BERNARDI, GIANNI 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. Udaya Shankar, N. Srivani, K. S. Subrahmanyan, R. Wayth, R. B. Webster, R. L. Williams, A. Williams, C. L. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 458 | Fascicolo: | 4 | Da pagina:: | 3506 | Abstract: | We present a survey for transient and variable sources, on time-scales from 28 s to ∼1 yr, using the Murchison Widefield Array (MWA) at 182 MHz. Down to a detection threshold of 0.285 Jy, no transient candidates were identified, making this the most constraining low-frequency survey to date and placing a limit on the surface density of transients of <4.1 × 10<SUP>-7</SUP> deg<SUP>-2</SUP> for the shortest time-scale considered. At these frequencies, emission from Fast Radio Bursts (FRBs) is expected to be detectable in the shortest time-scale images without any corrections for interstellar or intergalactic dispersion. At an FRB limiting flux density of 7980 Jy, we find a rate of <82 FRBs per sky per day for dispersion measures <700 pc cm<SUP>-3</SUP>. Assuming a cosmological population of standard candles, our rate limits are consistent with the FRB rates obtained by Thornton et al. if they have a flat spectral slope. Finally, we conduct an initial variability survey of sources in the field with flux densities ≳0.5 Jy and identify no sources with significant variability in their light curves. However, we note that substantial further work is required to fully characterize both the short-term and low-level variability within this field. | URI: | http://hdl.handle.net/20.500.12386/26337 | URL: | https://academic.oup.com/mnras/article/458/4/3506/2613802 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw451 | Bibcode ADS: | 2016MNRAS.458.3506R | Fulltext: | open |
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