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arXiv 1703.07855astro-ph.HE
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银河系中心瞬变的钱德拉尘埃散射晕J174540 .7-290015

The Chandra Dust Scattering Halo of Galactic Center transient Swift J174540.7-290015

L. Corrales, B. Mon, D. Haggard, F. Baganoff, G. Garmire, N. Degenaar, M. Reynolds

摘要:

我们报告了最近发现的X射线瞬变现象Swift J174540.7-290015周围的尘埃散射晕的探测结果,该瞬变现象在2016年2月初经历了从银河系中心场的一个紧凑物体观察到的最明亮的爆发之一(F_X ~ 5e-10 erg/cm^2/s)。我们分析了四张钱德拉的图像,这些图像是斯威夫特发现新的银河系中心瞬变的后续观测。在调整我们的光谱提取检测器堆积的影响,我们构建了一个点扩散函数为每个观察,并比较它的GC领域爆发前。我们发现斯威夫特J174540.7-290015周围的剩余表面亮度,其形状和时间演变与前景尘埃散射的X射线的预期行为一致。我们研究了源的光谱特性,这表明当它在LX ~ 1 e36 erg/s以下衰减时,该物体从软光谱状态过渡到硬光谱状态。这种行为与该物体是银河系中心的低质量X射线双星的假设一致。

英文摘要:

We report the detection of a dust scattering halo around a recently discovered X-ray transient, Swift J174540.7-290015, which in early February of 2016 underwent one of the brightest outbursts (F_X ~ 5e-10 erg/cm^2/s) observed from a compact object in the Galactic Center field. We analyze four Chandra images that were taken as follow-up observations to Swift discoveries of new Galactic Center transients. After adjusting our spectral extraction for the effects of detector pileup, we construct a point spread function for each observation and compare it to the GC field before the outburst. We find residual surface brightness around Swift J174540.7-290015, which has a shape and temporal evolution consistent with the behavior expected from X-rays scattered by foreground dust. We examine the spectral properties of the source, which shows evidence that the object transitioned from a soft to hard spectral state as it faded below L_X ~ 1e36 erg/s. This behavior is consistent with the hypothesis that the object is a low mass X-ray binary in the Galactic Center.

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