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    Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend

    261529.pdf (2.039Mb)
    Access Status
    Open access
    Authors
    Karastergiou, A.
    Chennamangalam, J.
    Armour, W.
    Williams, C.
    Mort, B.
    Dulwich, F.
    Salvini, S.
    Magro, A.
    Roberts, S.
    Serylak, M.
    Doo, A.
    Bilous, A.
    Breton, R.
    Falcke, H.
    Grießmeier, J.
    Hessels, J.
    Keane, E.
    Kondratiev, V.
    Kramer, M.
    Van Leeuwen, J.
    Noutsos, A.
    Oslowski, S.
    Sobey, Charlotte
    Stappers, B.
    Weltevrede, P.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Karastergiou, A. and Chennamangalam, J. and Armour, W. and Williams, C. and Mort, B. and Dulwich, F. and Salvini, S. et al. 2015. Limits on fast radio bursts at 145 MHz with ARTEMIS, a real-time software backend. Monthly Notices of the Royal Astronomical Society. 452 (2): pp. 254-1262.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stv1306
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/63515
    Collection
    • Curtin Research Publications
    Abstract

    Fast radio bursts (FRBs) are millisecond radio signals that exhibit dispersion larger than what the Galactic electron density can account for. We have conducted a 1446 h survey for FRBs at 145 MHz, covering a total of 4193 deg<sup>2</sup> on the sky. We used the UK station of the low frequency array (LOFAR) radio telescope - the Rawlings Array - accompanied for a majority of the time by the LOFAR station at Nançay, observing the same fields at the same frequency. Our real-time search backend, Advanced Radio Transient Event Monitor and Identification System - ARTEMIS, utilizes graphics processing units to search for pulses with dispersion measures up to 320 cm<sup>-3</sup> pc. Previous derived FRB rates from surveys around 1.4 GHz, and favoured FRB interpretations, motivated this survey, despite all previous detections occurring at higher dispersion measures.We detected no new FRBs above a signal-to-noise threshold of 10, leading to the most stringent upper limit yet on the FRB event rate at these frequencies: 29 sky<sup>-1</sup> d<sup>-1</sup> for five ms-duration pulses above 62 Jy. The non-detection could be due to scatter-broadening, limitations on the volume and time searched, or the shape of FRB flux density spectra. Assuming the latter and that FRBs are standard candles, the non-detection is compatible with the published FRB sky rate, if their spectra follow a power law with frequency (??<sup>a</sup>), with a ? +0.1, demonstrating a marked difference from pulsar spectra. Our results suggest that surveys at higher frequencies, including the low frequency component of the Square Kilometre Array, will have better chances to detect, estimate rates and understand the origin and properties of FRBs.

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