Polarization of the prompt γ-ray emission from the γ-ray burst of 6 December 2002
Observations of the afterglows of gamma-ray bursts (GRBs) have revealed that they lie at cosmological distances, and so correspond to the release of an enormous amount of energy. The nature of the central engine that powers these events and the prompt gamma-ray emission mechanism itself remain enigm...
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| Veröffentlicht in: | Nature (London) 2003-05, Vol.423 (6938), p.415-417 |
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| description | Observations of the afterglows of gamma-ray bursts (GRBs) have revealed that they lie at cosmological distances, and so correspond to the release of an enormous amount of energy. The nature of the central engine that powers these events and the prompt gamma-ray emission mechanism itself remain enigmatic because, once a relativistic fireball is created, the physics of the afterglow is insensitive to the nature of the progenitor. Here we report the discovery of linear polarization in the prompt gamma-ray emission from GRB021206, which indicates that it is synchrotron emission from relativistic electrons in a strong magnetic field. The polarization is at the theoretical maximum, which requires a uniform, large-scale magnetic field over the gamma-ray emission region. A large-scale magnetic field constrains possible progenitors to those either having or producing organized fields. We suggest that the large magnetic energy densities in the progenitor environment (comparable to the kinetic energy densities of the fireball), combined with the large-scale structure of the field, indicate that magnetic fields drive the GRB explosion. |
| doi_str_mv | 10.1038/nature01612 |
| format | Article |
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The nature of the central engine that powers these events and the prompt gamma-ray emission mechanism itself remain enigmatic because, once a relativistic fireball is created, the physics of the afterglow is insensitive to the nature of the progenitor. Here we report the discovery of linear polarization in the prompt gamma-ray emission from GRB021206, which indicates that it is synchrotron emission from relativistic electrons in a strong magnetic field. The polarization is at the theoretical maximum, which requires a uniform, large-scale magnetic field over the gamma-ray emission region. A large-scale magnetic field constrains possible progenitors to those either having or producing organized fields. 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We suggest that the large magnetic energy densities in the progenitor environment (comparable to the kinetic energy densities of the fireball), combined with the large-scale structure of the field, indicate that magnetic fields drive the GRB explosion.</description><subject>Astronomy</subject><subject>Earth, ocean, space</subject><subject>Emissions</subject><subject>Exact sciences and technology</subject><subject>Gamma rays</subject><subject>Gamma-ray sources ; gamma-ray bursts</subject><subject>Kinetic energy</subject><subject>Magnetic fields</subject><subject>Polarization</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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Academic</collection><jtitle>Nature (London)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>COBURN, Wayne</au><au>BOGGS, Steven E</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Polarization of the prompt γ-ray emission from the γ-ray burst of 6 December 2002</atitle><jtitle>Nature (London)</jtitle><addtitle>Nature</addtitle><date>2003-05-22</date><risdate>2003</risdate><volume>423</volume><issue>6938</issue><spage>415</spage><epage>417</epage><pages>415-417</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><coden>NATUAS</coden><abstract>Observations of the afterglows of gamma-ray bursts (GRBs) have revealed that they lie at cosmological distances, and so correspond to the release of an enormous amount of energy. The nature of the central engine that powers these events and the prompt gamma-ray emission mechanism itself remain enigmatic because, once a relativistic fireball is created, the physics of the afterglow is insensitive to the nature of the progenitor. Here we report the discovery of linear polarization in the prompt gamma-ray emission from GRB021206, which indicates that it is synchrotron emission from relativistic electrons in a strong magnetic field. The polarization is at the theoretical maximum, which requires a uniform, large-scale magnetic field over the gamma-ray emission region. A large-scale magnetic field constrains possible progenitors to those either having or producing organized fields. 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| ispartof | Nature (London), 2003-05, Vol.423 (6938), p.415-417 |
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| source | Springer Nature - Complete Springer Journals; Nature Journals Online |
| subjects | Astronomy Earth, ocean, space Emissions Exact sciences and technology Gamma rays Gamma-ray sources gamma-ray bursts Kinetic energy Magnetic fields Polarization Stellar systems. Galactic and extragalactic objects and systems. The universe Unidentified sources and radiation outside the solar system |
| title | Polarization of the prompt γ-ray emission from the γ-ray burst of 6 December 2002 |
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