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arXiv 1107.4833astro-ph.HE
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来自PSR B1259-63/LS 2883的近星点后Gamma Ray耀斑是冷脉冲星风康普顿化的结果

Post-Periastron Gamma Ray Flare from PSR B1259-63/LS 2883 as a Result of Comptonization of the Cold Pulsar Wind

D. Khangulyan, F. A. Aharonian, S. V. Bogovalov, M. Ribo

摘要:

我们认为,脉冲双星\object{PSR B1259$-$63/LS2883}的明亮耀斑是由具有洛伦兹因子$Γ_0 \approx 10^4$的未受冲击的电子-正电子脉冲星风的逆康普顿散射引起的。这两种效应的结合都与星周盘(CD)有关,是所提出的模型中的一个关键因素。第一个效应与周围介质对脉冲星风终止的影响有关。在星盘内部,风的“提前”终止导致其伽马射线亮度受到抑制。当脉冲星脱离盘时,风终止的条件发生了重大变化。这将导致脉冲星风区的急剧增加,从而导致伽马射线通量的成比例增加。另一方面,如果被脉冲星扰动的CD部分能够提供足够高密度的红外光子,以使风有效地康普顿化,那么脉冲星风的几乎全部动能将被转换为辐射,因此风的伽马射线光度可以接近{ \it Fermi}合作报告的脉冲星自旋下降光度的水平。

英文摘要:

We argue that the bright flare of the binary pulsar \object{PSR B1259$-$63/LS2883} detected by the {\it Fermi} Large Area Telescope (LAT), is due to the inverse Compton (IC) scattering of the unshocked electron-positron pulsar wind with a Lorentz factor $Γ_0 \approx 10^4$. The combination of two effects both linked to the circumstellar disk (CD), is a key element in the proposed model. The first effect is related to the impact of the surrounding medium on the termination of the pulsar wind. Inside the disk, the "early" termination of the wind results in suppression of its gamma-ray luminosity. When the pulsar escapes the disk, the conditions for termination of the wind undergo significant changes. This would lead to a dramatic increase of the pulsar wind zone, and thus to the proportional increase of the gamma-ray flux. On the other hand, if the parts of the CD disturbed by the pulsar can supply infrared photons of density high enough for efficient Comptonization of the wind, almost the entire kinetic energy of the pulsar wind would be converted to radiation, thus the gamma-ray luminosity of the wind could approach to the level of the pulsar's spin-down luminosity as reported by the {\it Fermi} collaboration.

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