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arXiv 0711.2290astro-ph
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异常X射线脉冲星1 E 1048.1-5937 2007年X射线耀斑期间的光学/红外观测

Optical/Infrared Observations of the Anomalous X-ray Pulsar 1E 1048.1-5937 During Its 2007 X-Ray Flare

Z. Wang, C. Bassa, V. M. Kaspi, J. B. Bryant, N. Morrell

摘要:

我们报告的光学和红外观测的异常X射线脉冲星(AXP)1 E 1048.1-5937,在其持续的X射线耀斑开始于2007年3月。我们在两次地面观测中探测到了光学I和近红外Ks波段的源,并从四次观测中获得了深通量上限,其中一次是用斯皮策太空望远镜在4.5和8.0微米处观测的。探测结果表明,该源比2003- 2006年亮了大约1.3- 1.6等,当时它位于前一次类似的X射线耀斑的尾部。在另外两个AXP的X射线爆发过程中也观察到了类似的相关通量变化,这表明AXP中大X射线通量变化事件的共同行为。斯皮策通量1 E 1048.1-5937的极限足够深,我们可以排除类似于AXP 4U 0142+61的中红外辐射,这被解释为来自AXP周围的尘埃盘。光学/近红外发射可能有一个磁层的起源。4U 0142+61和1 E 1048.1-5937通量谱的相似性对后者的尘埃盘模型提出了挑战。

英文摘要:

We report on optical and infrared observations of the anomalous X-ray pulsar (AXP) 1E 1048.1-5937, made during its ongoing X-ray flare which started in 2007 March. We detected the source in the optical I and near-infrared Ks bands in two ground-based observations and obtained deep flux upper limits from four observations, including one with the Spitzer Space Telescope at 4.5 and 8.0 microns. The detections indicate that the source was approximately 1.3--1.6 magnitudes brighter than in 2003--2006, when it was at the tail of a previous similar X-ray flare. Similar related flux variations have been seen in two other AXPs during their X-ray outbursts, suggesting common behavior for large X-ray flux variation events in AXPs. The Spitzer flux 1E 1048.1-5937 limits are sufficiently deep that we can exclude mid-infrared emission similar to that from the AXP 4U 0142+61, which has been interpreted as arising from a dust disk around the AXP. The optical/near-infrared emission from probably has a magnetospheric origin. The similarity in the flux spectra of 4U 0142+61 and 1E 1048.1-5937 challenges the dust disk model proposed for the latter.

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