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首页> 外文期刊>The Astrophysical journal >CONSTRAINING A GENERAL-RELATIVISTIC FRAME-DRAGGING MODEL FOR PULSED RADIATION FROM A POPULATION OF MILLISECOND PULSARS IN 47 TUCANAE USING GLAST LAT
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CONSTRAINING A GENERAL-RELATIVISTIC FRAME-DRAGGING MODEL FOR PULSED RADIATION FROM A POPULATION OF MILLISECOND PULSARS IN 47 TUCANAE USING GLAST LAT

机译：使用Glast Lat构造47种金枪鱼微细脉冲群中的脉冲相对辐射的一般相对论框架拖曳模型

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摘要

Although only 22 millisecond pulsars (MSPs) are currently known to exist in the globular cluster (GC) 47 Tucanae, this cluster may harbor 30-60 MSPs, or even up to ～200. In this Letter, we model the pulsed curvature radiation (CR) gamma-ray flux expected from a population of MSPs in 47 Tucanae. These MSPs produce gamma rays in their magnetospheres via accelerated electron primaries which are moving along curved magnetic field lines. A GC such as 47 Tucanae containing a large number of MSPs provides the opportunity to study a randomized set of pulsar geometries. Geometry-averaged spectra make the testing of the underlying pulsar model more reliable, since in this case the relative flux uncertainty is reduced by 1 order of magnitude relative to the variation expected for individual pulsars (if the number of visible pulsars N = 100). Our predicted spectra violate the EGRET upper limit at 1 GeV, constraining the product of the number of visible pulsars N and the average integral flux above 1 GeV per pulsar. GLAST LAT should place even more stringent constraints on this product, and may also limit the maximum average accelerating potential by probing the CR spectral tail. For N - 22-200, a GLAST LAT nondetection will lead to the constraints that the average integral flux per pulsar should be lower by factors of 0.03-0.003 than current model predictions.
机译：尽管目前已知球状星团（GC）47 Tucanae中仅存在22毫秒脉冲星（MSP），但该星团可能包含30-60个MSP，甚至高达200个。在这封信中，我们对来自47个杜卡尼（Tucanae）MSP种群的脉冲曲率辐射（CR）伽马射线通量建模。这些MSP通过沿弯曲磁场线移动的加速电子原边在其磁层中产生伽马射线。包含大量MSP的GC（例如47 Tucanae）为研究随机的脉冲星几何集提供了机会。几何平均光谱使基础脉冲星模型的测试更加可靠，因为在这种情况下，相对通量不确定性相对于单个脉冲星的预期变化降低了1个数量级（如果可见脉冲星的数量N = 100）。我们的预测光谱在1 GeV处违反了EGRET上限，从而限制了可见脉冲星N的数量与每个脉冲星1 GeV以上的平均积分通量的乘积。 GLAST LAT应该对该产品施加更严格的约束，并且还可能通过探测CR光谱尾部来限制最大平均加速电位。对于N-22-200，未检测到GLAST LAT将导致约束，即每个脉冲星的平均积分通量应比当前模型预测低0.03-0.003倍。

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