Steep Slopes and Preferred Breaks in Gamma-Ray Burst Spectra: The Role of Photospheres and Comptonization
Steep Slopes and Preferred Breaks in Gamma-Ray Burst Spectra: The Role of Photospheres and Comptonization
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DOI：
10.1086/308371
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发表时间：
1999-08
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影响因子：
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通讯作者：
P. M. M. R. P. S. U. I. Physics-P.-M.-M.-R.-P.-S.-U.-I.-Physics-2264718187;Ucsb Inst. of Astronomy;Cambridge University
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文献类型：
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作者：
P. M. M. R. P. S. U. I. Physics-P.-M.-M.-R.-P.-S.-U.-I.-Physics-2264718187;Ucsb Inst. of Astronomy;Cambridge University
光球组件和对击穿的作用进行了检查的伽玛射线暴的内部冲击模型。我们讨论了一些机制，它们会产生异常陡峭的低能量斜坡，X射线过剩和首选的能量突破。次相对论性康普顿化在具有高重子负载的高共动光度爆发中占主导地位，而同步辐射在具有较低共动光度或具有中到低重子负载的爆发中占主导地位。光球导致陡峭的低能光谱斜率应该在最低的重子负载情况下突出。
The role of a photospheric component and of pair breakdown is examined in the internal shock model of gamma-ray bursts. We discuss some of the mechanisms by which they would produce anomalously steep low-energy slopes, X-ray excesses and preferred energy breaks. Subrelativistic Comptonization should dominate in high comoving luminosity bursts with high baryon load, while synchrotron radiation dominates the power-law component in bursts which have lower comoving luminosity or have moderate to low baryon loads. A photosphere leading to steep low-energy spectral slopes should be prominent in the lowest baryon load cases.