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arXiv 1704.02573astro-ph.HE
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吸积毫秒X射线脉冲星天鹰座X-1爆发的形态学

On the morphology of outbursts of accreting millisecond X-ray pulsar Aquila X-1

Can Güngör, Kazım Yavuz Ekşi, Ersin Göğüş

摘要:

我们使用$2-20$ keV波段的全天X射线图像(MAXI)观测监视器,展示了著名吸积毫秒X射线脉冲星(AMXP)天鹰座X-1最近两次爆发(2014年和2016年)的X射线光变曲线。在将(MAXI)计数率校准到全天空监测器(ASM)水平后,我们报告说,2016年的爆发是Aql X-1有史以来从该来源观察到的最具活力的事件。根据Güngör等人提出的分类,我们发现2016年的爆发属于长-高级别,具有$\sim68$ cnt/s最大通量和$\sim60$天持续时间,而2014年的前一次爆发属于短-低级别,具有$\sim 25$ cnt/s最大通量和$\sim 30$天持续时间。为了了解爆发之间的差异,我们调查可能的依赖性的峰值强度的静止持续时间导致爆发,并发现爆发后较长的静止发作往往达到更高的峰值能量。

英文摘要:

We present the X-ray light curves of the last two outbursts --2014 & 2016-- of the well known accreting millisecond X-ray pulsar (AMXP) Aquila X-1 using the monitor of all sky X-ray image (MAXI) observations in the $2-20$ keV band. After calibrating the (MAXI) count rates to the all-sky monitor (ASM) level, we report that the 2016 outburst is the most energetic event of Aql X-1, ever observed from this source. We show that 2016 outburst is a member of the long-high class according to the classification presented by Güngör et al. with $\sim68$ cnt/s maximum flux and $\sim60$ days duration time and the previous outburst, 2014, belongs to the short-low class with $\sim 25$ cnt/s maximum flux and $\sim 30$ days duration time. In order to understand differences between outbursts, we investigate the possible dependence of the peak intensity to the quiescent duration leading to the outburst and find that the outbursts following longer quiescent episodes tend to reach higher peak energetic.

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