论文标题
脉冲和非脉冲ULX：冰山出现
Pulsing and Non-Pulsing ULXs: the Iceberg Emerges
论文作者
论文摘要
我们表明，具有相干X射线脉冲（PULX）的超充血X射线源（ULX）可能的中子旋转轴可能从其中央积聚盘中显着未对准。在漏斗中的散射准入其发射并产生其明显的超级 - 埃德丁顿亮度是观察到的脉冲分数与X射线光子能量之间相关性的最有可能的起源。脉冲在系统中被抑制，中子星形旋转与内盘紧密排列，这解释了为什么某些ULXS显示了表明强烈磁场但不脉冲的回旋体特征。我们建议，对齐（或者可以想象，通过积聚的场抑制）通常发生在ULX寿命的相当短的一部分之内，因此大多数中子星ULX被拆下。结果，我们进一步建议，几乎所有的ULX实际上都有中子星的增生器，而不是黑洞或白色矮人，反映了其祖细胞高质量X射线二进制二进制和SuperSoft X射线源群体。
We show that ultraluminous X-ray sources (ULXs) with coherent X-ray pulsing (PULXs) probably have neutron-star spin axes significantly misaligned from their central accretion discs. Scattering in the funnels collimating their emission and producing their apparent super-Eddington luminosities is the most likely origin of the observed correlation between pulse fraction and X-ray photon energy. Pulsing is suppressed in systems with the neutron-star spin closely aligned to the inner disc, explaining why some ULXs show cyclotron features indicating strong magnetic fields, but do not pulse. We suggest that alignment (or conceivably, field suppression through accretion) generally occurs within a fairly short fraction of the ULX lifetime, so that most neutron-star ULXs become unpulsed. As a result we further suggest that almost all ULXs actually have neutron-star accretors, rather than black holes or white dwarfs, reflecting their progenitor high-mass X-ray binary and supersoft X-ray source populations.
