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首页> 外文期刊>The Astrophysical journal >ELECTRON ACCELERATION AROUND THE SUPERMASSIVE BLACK HOLE AT THE GALACTIC CENTER
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ELECTRON ACCELERATION AROUND THE SUPERMASSIVE BLACK HOLE AT THE GALACTIC CENTER

机译：银河系中心超大黑洞周围的电子加速

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摘要

The recent detection of variable infrared emission from Sagittarius A~* combined with its previously observed flare activity in X-rays provide compelling evidence that at least a portion of this object's emission is produced by nonthermal electrons. The polarization and variability of Sgr A~*'s emission depend strongly on the observed wavelength, indicating distinct physical processes. We show here that acceleration of electrons by plasma wave turbulence in hot gases near the black hole's event horizon can, although with several theoretical uncertainties, reasonably account both for Sgr A~*'s millimeter and shorter wavelength emission in the quiescent state and for the infrared and X-ray flares, induced either via an enhancement of the mass accretion rate onto the black hole or by reorganization of magnetic fields coupled to the accretion gas. High-energy electrons diffusing away from the acceleration site toward larger radii might account for Sgr A~*'s emission at longer wavelengths. The acceleration model produces prominent IR flares accompanying X-ray bursts. Future coordinated multiwavelength observations will be able to test this model and constrain its parameters.
机译：最近从射手座A〜*探测到的可变红外发射及其先前在X射线中观察到的耀斑活性提供了令人信服的证据，证明该物体发射的至少一部分是由非热电子产生的。 Sgr A〜*发射的极化和可变性在很大程度上取决于所观察到的波长，表明不同的物理过程。我们在这里表明，尽管有一些理论上的不确定性，但在黑洞事件视界附近的热气体中，由等离子体波湍流引起的电子加速可以合理地解释Sgr A〜*的毫米数和在静止状态下较短的波长发射以及红外和X射线耀斑是通过增加黑洞上的质量积聚率或通过重组与积聚气体耦合的磁场而引起的。高能电子从加速点扩散到更大的半径可能解释了Sgr A〜*在更长波长下的发射。加速模型会伴随X射线爆发产生明显的红外耀斑。未来的多波长协调观测将能够测试该模型并约束其参数。

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