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

被引：60

作者：

Stewart, A. J. ^{[1
,2
]}

Fender, R. P. ^{[1
,2
]}

Broderick, J. W. ^{[1
,2
,3
]}

Hassall, T. E. ^{[1
,2
]}

Munoz-Darias, T. ^{[1
,2
,4
,5
]}

Rowlinson, A. ^{[3
,6
]}

Swinbank, J. D. ^{[6
,7
]}

Staley, T. D. ^{[1
,2
]}

Molenaar, G. J. ^{[6
,8
]}

Scheers, B. ^{[6
,9
]}

Grobler, T. L. ^{[8
,10
]}

Pietka, M. ^{[1
,2
]}

Heald, G. ^{[3
,11
]}

McKean, J. P. ^{[3
,11
]}

Bell, M. E. ^{[12
,13
]}

Bonafede, A. ^{[14
]}

Breton, R. P. ^{[2
,15
]}

Carbone, D. ^{[6
]}

Cendes, Y. ^{[6
]}

Clarke, A. O. ^{[2
,15
]}

Corbel, S. ^{[16
,17
]}

de Gasperin, F. ^{[14
]}

Eisloeffel, J. ^{[18
]}

Falcke, H. ^{[3
,19
]}

Ferrari, C. ^{[20
]}

Griemeier, J. -M. ^{[17
,21
]}

Hardcastle, M. J. ^{[22
]}

Heesen, V. ^{[2
]}

Hessels, J. W. T. ^{[3
,6
]}

Horneffer, A. ^{[23
]}

Iacobelli, M. ^{[3
]}

Jonker, P. ^{[19
,24
]}

Karastergiou, A. ^{[1
]}

Kokotanekov, G. ^{[6
]}

Kondratiev, V. I. ^{[3
,25
]}

Kuniyoshi, M. ^{[26
]}

Law, C. J. ^{[27
,28
]}

van Leeuwen, J. ^{[3
,6
]}

Markoff, S. ^{[6
]}

Miller-Jones, J. C. A. ^{[29
]}

Mulcahy, D. ^{[2
,15
]}

Orru, E. ^{[3
]}

Pandey-Pommier, M. ^{[30
]}

Pratley, L. ^{[31
]}

Rol, E. ^{[32
]}

Rottgering, H. J. A. ^{[33
]}

Scaife, A. M. M. ^{[15
]}

Shulevski, A. ^{[11
]}

Sobey, C. A. ^{[3
]}

Stappers, B. W. ^{[15
]}

机构：

[1] Univ Oxford, Dept Phys, Astrophys, Keble Rd, Oxford OX1 3RH, England

[2] Univ Southampton, Phys & Astron, Southampton SO17 1BJ, Hants, England

[3] Netherlands Inst Radio Astron, ASTRON, Postbus 2, NL-7990 AA Dwingeloo, Netherlands

[4] Inst Astrofis Canarias, E-38200 Tenerife, Spain

[5] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

[6] Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands

[7] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[8] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

[9] Ctr Wiskunde & Informat, Sci Pk 123, NL-1098 XG Amsterdam, Netherlands

[10] SKA South Africa, 3rd Floor,The Pk,Pk Rd, ZA-7405 Cape Town, South Africa

[11] Univ Groningen, Kapteyn Astron Inst, POB 800, NL-9700 AV Groningen, Netherlands

[12] CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia

[13] Univ Sydney, ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW 2006, Australia

[14] Univ Hamburg, Gojenbergsweg 112, D-21029 Hamburg, Germany

[15] Univ Manchester, Jodrell Bank Ctr Astrophys, Sch Phys & Astron, Manchester M13 9PL, Lancs, England

[16] Univ Paris Diderot, Lab AIM, CEA, IRFU,CNRS,INSU,CEA DSM,IRFU,SAp, F-91191 Gif Sur Yvette, France

[17] Univ Orleans, PSL Res Univ, Observ Paris, Stn Radioastron Nancay,OSUC, F-18330 Nancay, France

[18] Thuringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany

[19] Radboud Univ Nijmegen, Dept Astrophys IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands

[20] Univ Nice Sophia Antipolis, UMR 7293, Lab Lagrange, CNRS,Observ Cote Azur, F-06300 Nice, France

[21] Univ Orleans, CNRS, LPC2E, 3A,Ave Rech Sci, F-45071 Orleans 2, France

[22] Univ Hertfordshire, Sch Phys Astron & Math, Coll Lane, Hatfield AL10 9AB, Herts, England

[23] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[24] SRON Netherlands Insitute Space Res, POB 800, NL-9700 AV Groningen, Netherlands

[25] Lebedev Phys Inst, Astro Space Ctr, Profsoyuznaya Str 84-32, Moscow 117997, Russia

[26] Natl Astron Observ Japan, NAOJ Chile Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[27] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[28] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA

[29] Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845, Australia

[30] Observ Lyon, Ctr Rech Astrophys Lyon, 9 Av Charles Andr E, F-69561 St Genis Laval, France

[31] Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand

[32] Monash Univ, Sch Phys & Astron, POB 27, Clayton, Vic 3800, Australia

[33] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[34] Univ Paris Diderot, CNRS, Observ Paris, GEPI, 5 Pl Jules Janssen, F-92190 Meudon, France

[35] George Washington Univ, Dept Phys, 725 21st St NW, Washington, DC 20052 USA

[36] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[37] Univ Paris Diderot, Univ Paris 06, CNRS, Observ Paris,LESLA, 5 Pl Jules Janssen, F-92195 Meudon, France

[38] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[39] Deutsch GeoForschungsZentrum GFZ, Dept Geodesy & Remote Sensing 1, Helmholtz Zentrum Potsdam, Telegrafenberg A17, D-14473 Potsdam, Germany

[40] Shell Technol Ctr, Bangalore, Karnataka, India

[41] Univ Twente, POB 217, NL-7500 AE Enschede, Netherlands

[42] Univ Edinburgh, Royal Observ Edinburgh, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[43] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[44] Australian Natl Univ, Res Sch Astron & Astrophys, Via Cotter Rd, Weston, ACT 2611, Australia

[45] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85741 Garching, Germany

[46] Chalmers Univ Technol, Dept Earth & Space Sci, Onsala Space Observ, SE-43992 Onsala, Sweden

[47] SmarterVis BV, Oostersingel 5, NL-9401 JX Assen, Netherlands

[48] Ruhr Univ Bochum, Astron Inst, Univ Str 150, D-44780 Bochum, Germany

[49] Univ Oulu, Sodankyla Geophys Observ, Tahtelantie 62, FI-99600 Sodankyla, Finland

[50] STFC Rutherford Appleton Lab, Harwell Sci & Innovat Campus, Didcot OX11 0QX, Oxon, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 456卷 / 03期

基金：

新加坡国家研究基金会; 欧洲研究理事会; 英国科学技术设施理事会;

关键词：

instrumentation: interferometers; techniques: image processing; radio continuum: general; GAMMA-RAY BURST; FLARE STARS; WIDE-FIELD; REIONIZATION WINDOWS; SKY; EMISSION; I; SEARCH; VARIABILITY; PULSAR;

D O I：

10.1093/mnras/stv2797

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：2321 / 2342

页数：22

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