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LOFAR MSSS: detection of a low-frequency radio transient in 400 h of monitoring of the North Celestial Pole

A. J. Stewart ; R. P. Fender ; J. W. Broderick ; T. E. Hassall ; T. Munoz-Darias ; A. Rowlinson ; J. D. Swinbank ; T. D. Staley ; G. J. Molenaar ; B. Scheers ; T. L. Grobler ; M. Pietka ; G. Heald ; J. P. McKean ; M. E. Bell ; A. Bonafede ; R. P. Breton ; D. Carbone ; Y. Cendes ; A. O. Clarke ; S. Corbel ; F. De Gasperin ; J. Eisloffel ; H. Falcke ; C. Ferrari ; J. M. Griemeier ; M. J. Hardcastle ; V. Heesen ; J. W. T. Hessels ; A. Horneffer ; M. Iacobelli ; P. Jonker ; A. Karastergiou ; G. Kokotanekov ; V. I. Kondratiev ; M. Kuniyoshi ; C. J. Law ; J. van Leeuwen ; S. Markoff ; J. C. A. Miller-Jones ; D. Mulcahy ; E. Orru ; M. Pandey-Pommier ; L. Pratley ; E. Rol ; H. J. A. Rottgering ; A. M. M. Scaife ; A. Shulevski ; C. A. Sobey ; B. W. Stappers ; C. Tasse ; A. J. van der Horst ; S. van Velzen ; R. J. van Weeren ; Ramj Wijers ; R. Wijnands ; M. Wise ; P. Zarka ; A. Alexov ; J. Anderson ; A. Asgekar ; I. M. Avruch ; M. J. Bentum ; G. Bernardi ; P. Best ; F. Breitling ; M. Bruggen ; H. R. Butcher ; B. Ciardi ; John Conway (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; A. Corstanje ; E. de Geus ; A. Deller ; S. Duscha ; W. Frieswijk ; M. A. Garrett ; A. W. Gunst ; M. P. van Haarlem ; M. Hoeft ; J. Horandel ; E. Juette ; G. Kuper ; M. Loose ; P. Maat ; R. McFadden ; D. McKay-Bukowski ; J. Moldon ; H. Munk ; M. J. Norden ; H. Paas ; A. G. Polatidis ; D. Schwarz ; J. Sluman ; O. Smirnov ; M. Steinmetz ; S. Thoudam ; M. C. Toribio ; R. Vermeulen ; C. Vocks ; S. J. Wijnholds ; O. Wucknitz ; S. Yatawatta
Monthly notices of the Royal Astronomical Society (0035-8711). Vol. 456 (2016), 3, p. 2321-2342.
[Artikel, refereegranskad vetenskaplig]

We present the results of a four-month campaign searching for low-frequency radio transients near the North Celestial Pole with the Low-Frequency Array (LOFAR), as part of the Multifrequency Snapshot Sky Survey (MSSS). The data were recorded between 2011 December and 2012 April and comprised 2149 11-min snapshots, each covering 175 deg(2). We have found one convincing candidate astrophysical transient, with a duration of a few minutes and a flux density at 60 MHz of 15-25 Jy. The transient does not repeat and has no obvious optical or high-energy counterpart, as a result of which its nature is unclear. The detection of this event implies a transient rate at 60 MHz of 3.9(-3.7)(+14.7) x 10(-4) d(-1) deg(-2), and a transient surface density of 1.5 x 10(-5) deg(-2), at a 7.9-Jy limiting flux density and similar to 10-min time-scale. The campaign data were also searched for transients at a range of other time-scales, from 0.5 to 297 min, which allowed us to place a range of limits on transient rates at 60MHz as a function of observation duration.

Nyckelord: instrumentation: interferometers, techniques: image processing, radio continuum: general



Denna post skapades 2016-04-15. Senast ändrad 2016-05-26.
CPL Pubid: 234757

 

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