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arXiv 0705.3713astro-ph
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一颗瞬变异常X射线脉冲星的磁星性质和爆发机制

The Magnetar Nature and the Outburst Mechanism of a Transient Anomalous X-ray Pulsar

Tolga Guver, Feryal Ozel, Ersin Gogus, Chryssa Kouveliotou

摘要:

异常X射线脉冲星(AXP)属于一类中子星,据信拥有宇宙中最强的磁场,如它们的能量爆发和快速自旋所示。然而,一个明确的测量其表面场强度尚未作出日期。也不知道AXP爆发是否是由于中子星磁场或地壳性质的变化。在这里,我们报告的光谱测量的表面磁场强度的AXP,XTE J1810 $-$ 197,并巩固其磁星的性质。从详细的频谱分析和建模,B =(2.72 $\pm$ 0.03)$\times10^{14}$ G,获得的场强是非常接近的值推断,从该源的自旋下降的速度,并保持几乎恒定在许多观测跨越一个数量级的源通量。另一方面,地表温度在2003年爆发后稳步大幅下降。我们的研究结果表明,加热发生在上中子星地壳爆发期间,揭示了AXP的瞬态行为。

英文摘要:

Anomalous X-ray Pulsars (AXPs) belong to a class of neutron stars believed to harbor the strongest magnetic fields in the universe, as indicated by their energetic bursts and their rapid spindowns. However, an unambiguous measurement of their surface field strengths has not been made to date. It is also not known whether AXP outbursts result from changes in the neutron star magnetic field or crust properties. Here we report a spectroscopic measurement of the surface magnetic field strength of an AXP, XTE J1810$-$197, and solidify its magnetar nature. The field strength obtained from detailed spectral analysis and modeling, B = (2.72$\pm$0.03)$\times10^{14}$ G, is remarkably close to the value inferred from the rate of spindown of this source and remains nearly constant during numerous observations spanning over an order of magnitude in source flux. The surface temperature, on the other hand, declines steadily and dramatically following the 2003 outburst of this source. Our findings demonstrate that heating occurs in the upper neutron star crust during an outburst and sheds light on the transient behaviour of AXPs.

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