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DISCOVERY OF HARD X-RAY PULSATIONS FROM THE TRANSIENT SOURCE GRO J1744-28

机译：瞬时源GRO J1744-28的硬X射线脉冲发现

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摘要

AN UNUSUAL astronomical source of hard X-ray bursts, GRO J1744 - 28, was discovered recently(1,2). The properties of this source differ markedly from those of other known high-energy burst sources-X-ray bursters, soft gamma-ray repeaters and gamma-ray bursters- suggesting that it may represent a new type of source. The bursts probably arise from unstable accretion of matter onto a compact object(2), such as a neutron star, but the nature of the object and the origin of the burst instability have not been revealed by observations of the bursts themselves. Here we report the detection of coherent X-ray pulsations, with a period of 467 milliseconds, from GRO J1744 - 28; these are the first persistent pulsations seem in a bursting X-ray source. These pulses and their timing indicate that the object is a magnetized neutron star, accreting gas from a low-mass companion star. The pulsation rate has been increasing during the period of our observations, indicating that an accretion disk has been formed and that the transfer of matter from the disk is spinning up the neutron star. The source of the instability that leads to the bursts remains unknown. [References: 24]
机译：最近发现了一个不寻常的硬X射线爆发的天文来源GRO J1744-28（1,2）。该辐射源的特性与其他已知的高能脉冲辐射源（X射线爆发器，软伽马射线中继器和伽马射线爆发器）明显不同，表明它可能代表了一种新型的来源。爆炸可能是由于物质在诸如中子星之类的紧凑物体（2）上的不稳定积聚而产生的，但是物体的性质和爆炸不稳定性的起源尚未通过观察到爆炸本身而揭示出来。在这里，我们报告了从GRO J1744-28检测到相干X射线脉动，周期为467毫秒；这些是X射线源爆裂中出现的第一个持续性搏动。这些脉冲及其定时表明该物体是一个磁化的中子星，从低质量伴星吸收气体。在我们观察期间，脉动速率一直在增加，这表明吸积盘已经形成，物质从盘的转移正在旋转中子星。导致爆发的不稳定原因仍然未知。 [参考：24]

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