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Circular polarization in the optical afterglow of GRB 121024A
Wiersema, K.1; Covino, S.2; Toma, K.3,4,5; van der Horst, A. J.6; Varela, K.7; Min, M.6; Greiner, J.7; Starling, R. L. C.1; Tanvir, N. R.1; Wijers, R. A. M. J.6; Campana, S.2; Curran, P. A.8; Fan, Y.9; Fynbo, J. P. U.10; Gorosabel, J.11,12,13; Gomboc, A.14; Goetz, D.15; Hjorth, J.10; Jin, Z. P.9; Kobayashi, S.16; Kouveliotou, C.17; Mundell, C.16; O'Brien, P. T.1; Pian, E.18,19; Rowlinson, A.6; Russell, D. M.20,21,22; Salvaterra, R.23; Alighieri, S. di Serego24; Tagliaferri, G.2; Vergani, S. D.2; Elliott, J.7; Farina, C.25; Hartoog, O. E.6; Karjalainen, R.25; Klose, S.26; Knust, F.7; Levan, A. J.27; Schady, P.7; Sudilovsky, V.7; Willingale, R.1
Source PublicationNATURE
AbstractGamma-ray bursts (GRBs) are most probably powered by collimated relativistic outflows (jets) from accreting black holes at cosmological distances. Bright afterglows are produced when the outflow collides with the ambient medium. Afterglow polarization directly probes the magnetic properties of the jet when measured minutes after the burst, and it probes the geometric properties of the jet and the ambient medium when measured hours to days after the burst(1-5). High values of optical polarization detected minutes after the burst of GRB 120308A indicate the presence of large-scale ordered magnetic fields originating from the central engine(5) (the power source of the GRB). Theoretical models predict low degrees of linear polarization and no circular polarization at late times(6-8), when the energy in the original ejecta is quickly transferred to the ambient medium and propagates farther into the medium as a blast wave. Here we report the detection of circularly polarized light in the afterglow of GRB 121024A, measured 0.15 days after the burst. We show that the circular polarization is intrinsic to the afterglow and unlikely to be produced by dust scattering or plasma propagation effects. A possible explanation is to invoke anisotropic (rather than the commonly assumed isotropic) electron pitch-angle distributions, and we suggest that new models are required to produce the complex microphysics of realistic shocks in relativistic jets(9-11).
WOS HeadingsScience & Technology
Indexed BySCI
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000335454300033
Citation statistics
Cited Times:53[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
2.INAF Brera Astron Observ, I-23807 Merate, LC, Italy
3.Osaka Univ, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan
4.Tohoku Univ, Astron Inst, Sendai, Miyagi 9808578, Japan
5.Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808578, Japan
6.Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1090 SJ Amsterdam, Netherlands
7.Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
8.Curtin Univ, Int Ctr Radio Astron Res, Perth, WA 6845, Australia
9.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
10.Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark
11.CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain
12.Univ Pais Vasco UPV EHU, ETS Ingn, Dept Fis Aplicada, Unidad Asociada Grp Ciencia Planetarias UPV EHU I, E-48013 Bilbao, Spain
13.Basque Fdn Sci, Ikerbasque, E-48008 Bilbao, Spain
14.Univ Ljubljana, Fac Math & Phys, Ljubljana 1000, Slovenia
15.Univ Paris Diderot, CNRS, DSM, AIM UMR CEA 7158,Irfu Serv Astrophys, F-91191 Gif Sur Yvette, France
16.Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England
17.NASA, George C Marshall Space Flight Ctr, Space Sci Off, ZP12, Huntsville, AL 35812 USA
18.Scuola Normale Super Pisa, I-56126 Pisa, Italy
19.INAF IASF Bologna, I-40129 Bologna, Italy
20.Inst Astrofis Canarias, E-38200 San Cristobal la Laguna, Tenerife, Spain
21.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
22.New York Univ Abu Dhabi, Abu Dhabi, U Arab Emirates
23.INAF IASF Milano, I-20133 Milan, Italy
24.INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy
25.Isaac Newton Grp Telescopes, E-38700 Santa Cruz De La Palma, Canary Islands, Spain
26.Thuringer Landessternwarte Tautenburg, D-07778 Tautenburg, Germany
27.Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
Recommended Citation
GB/T 7714
Wiersema, K.,Covino, S.,Toma, K.,et al. Circular polarization in the optical afterglow of GRB 121024A[J]. NATURE,2014,509(7499):201-+.
APA Wiersema, K..,Covino, S..,Toma, K..,van der Horst, A. J..,Varela, K..,...&Willingale, R..(2014).Circular polarization in the optical afterglow of GRB 121024A.NATURE,509(7499),201-+.
MLA Wiersema, K.,et al."Circular polarization in the optical afterglow of GRB 121024A".NATURE 509.7499(2014):201-+.
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