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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Spectral Evolution of GRB060904A Observed with Swift and Suzaku- Possibility of Inefficient Electron Acceleration
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Spectral Evolution of GRB060904A Observed with Swift and Suzaku- Possibility of Inefficient Electron Acceleration

机译：Swift和Suzaku观测到的GRB060904A的光谱演化-电子加速效率低的可能性

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WeobservedanX-rayafterglowofGRB060904AwiththeSwiftandSuzakusatellites.WefoundrapidspectralsofteningduringboththeprompttailphaseandthedeclinephaseofanX-rayflareintheSwift/BATandSwift/XRTdata.Theobservedspectrawerefitbypower-lawphotonindiceswhichrapidlychangedfrom$$Gamma=$$1.51$$^{+0.04}_{-0.03}$$to$$Gamma=$$5.30$$^{+0.69}_{-0.59}$$withinafewhundredseconds.ThisisoneofthesteepestX-rayspectraeverobserved,makingitquitedifficulttoexplainbysimpleelectron-accelerationandsynchrotron-radiationprocesses.Wethenappliedanalternativebrokenpower-lawwithexponentialcutoff(BPEC)model.Itisvalidtoconsidertheexponentialshapeisequivalenttoasynchrotroncutoff.SincethespectralcutoffappearsinthesoftX-rayband,weconcludethattheelectronaccelerationmustbeinefficientintheinternalshocksofGRB060904A.Thesecutoffspectrasuddenlydisappearedattheendoftheprompttail.Afterthat,typicalafterglowspectrawith$$Gamma=$$2.0havebeencontinuouslyandpreciouslymonitoredbybothSwift/XRTandSuzaku/XIS.Wecouldsuccessfullytracethetemporalhistoryoftwocharacteristicbreakenergiesthathaveatimedependenceof$$proptot^{-3}$$-$$t^{-4}$$,whilethefollowingafterglowspectraarequitestable.Thisfactindicatesthattheemittingmaterialoftheprompttailisduetocompletelydifferentdynamicsfromtheshallowdecaycomponent.Therefore,theemissionsitesoftwodistinctphenomenaobviouslydifferfromeachother.
机译：我们在Swift和Suzakusatellite上观察了GRB060904A的X射线余辉。我们在Swift / BAT和Swift / XRT数据的提示尾相和下降阶段同时发现了快速光谱软化。观察到的光谱通过幂定律光子从$$$$ 3的$$$$$$$ 3 {$$$ 3 = $$ 3 $ _ $ _ $ _ $ _ 3 $ _ $$ _ $ _ $ _ 3 $ _ $ _ $$ _ $ _ $ _ 3 $ _ $$ _ $ _ $ _ $ _ $ _ $ _ $$ _ 3 $ _ $$ _ $ _ $ _ $ _ $ _ $$ _ $ _ $$ _ $ _ $$ 3 $ _ $ _ $ _ $ _ $ _ $ _ $ _ $ _ $$ _ $ _ $$ 3 $ _ $ _ $ _ $ _ $ _ $ _ $ _ $$ _ $ _ $$ _ $ _ $ _ $$ _ $$ 3 $ _ $ _ $ _ $ {-0.59} $$ withinafewhundredseconds.ThisisoneofthesteepestX-rayspectraeverobserved，makingitquitedifficulttoexplainbysimpleelectron-accelerationandsynchrotron-radiationprocesses.Wethenappliedanalternativebrokenpower-lawwithexponentialcutoff（BPEC）model.Itisvalidtoconsidertheexponentialshapeisequivalenttoasynchrotroncutoff.SincethespectralcutoffappearsinthesoftX-rayband，weconcludethattheelectronaccelerationmustbeinefficientintheinternalshocksofGRB060904A.Thesecutoffspectrasuddenlydisappearedattheendoftheprompttail.Afterthat，typicalafterglowspectrawith $$伽玛= $$ 2.0havebeencontinuouslyandpreciouslymonitoredbybothSwift / XRTandSuzaku / XIS我们可以成功追踪时间历史y的两个特征中断能量具有时间依赖性，取决于$$ prop ^^ {-3} $$-$$ t ^ {-4} $$，而下面的发光光谱则是可测试的。此事实表明，由浅色衰变组分产生的与另一种物质完全不同的动力是由该物质引起的。

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