论文标题
当地超临界ULX的螺旋桨状态
Propeller states in locally super-critical ULXs
论文作者
论文摘要
超X射线源（ULX）种群中中子星存在的预期标志是X射线光度的大规模变化，因为系统达到自旋平衡，随之而来的是螺旋桨状态。我们探讨了圆盘在局部超临界时的预测光度变化，发现偶极场强度和增生速率中的重要参数空间（在大半径上）可以伴随着小于亮度数量级的变化。 We discuss the spectral signature and locate three ULXs (IC 342 X-1, Cir ULX-5 and NGC 1313 X-1) which appear to show changes consistent with super-Eddington systems entering a propeller state, and place rough constraints on the dipole field strength of NGC 1313 X-1 of $<$ 10$^{10}$ G. This work implies that the most reliable means by which to search for putative propeller states将寻找硬度比和高能的变化。
An expected signature of the presence of neutron stars in the population of ultraluminous X-ray sources (ULXs) are large scale changes in X-ray luminosity, as systems reach spin equilibrium and a propeller state ensues. We explore the predicted luminosity changes when the disc is locally super-critical, finding that a significant parameter space in dipole field strength and accretion rate (at large radius) can be accompanied by changes of less than an order of magnitude in luminosity. We discuss the spectral signature and locate three ULXs (IC 342 X-1, Cir ULX-5 and NGC 1313 X-1) which appear to show changes consistent with super-Eddington systems entering a propeller state, and place rough constraints on the dipole field strength of NGC 1313 X-1 of $<$ 10$^{10}$ G. This work implies that the most reliable means by which to search for putative propeller states will be to search for changes in hardness ratio and at high energies.
