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arXiv 0712.2856astro-ph
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特反常X射线脉冲星1 E 1048.1-5937的变X射线和近红外行为

The Variable X-ray and Near-IR Behavior of the Particularly Anomaloux X-ray Pulsar 1E 1048.1-5937

Cindy R. Tam, Fotis P. Gavriil, Rim Dib, Victoria M. Kaspi, Peter M. Woods, Cees Bassa

摘要:

本文介绍了对被认为是磁星的异常X射线脉冲星1 E 1048.1-5937的X射线和近红外观测结果。在2001-2004年期间,AXP经历了一段极端的变化,但随后在2004-2006年进入了一个延长的和意想不到的平静,在此期间,我们用RXTE,CXO和HST监测它。在整个静止期,其定时特性稳定>3年。1 E 1048.1-5937于2007年3月再次爆发,其总X射线通量增加了7倍以上,这与脉冲分数减少反相关,并与光谱硬化相关。近红外对应物在2007年事件后也变亮。我们讨论我们的研究结果的背景下,磁星和其他模型。

英文摘要:

We present the results of X-ray and near-IR observations of the anomalous X-ray pulsar 1E 1048.1-5937, believed to be a magnetar. This AXP underwent a period of extreme variability during 2001-2004, but subsequently entered an extended and unexpected quiescence in 2004-2006, during which we monitored it with RXTE, CXO, and HST. Its timing properties were stable for >3 years throughout the quiescent period. 1E 1048.1-5937 again went into outburst in March 2007, which saw a factor of >7 total X-ray flux increase which was anti-correlated with a pulsed fraction decrease, and correlated with spectral hardening, among other effects. The near-IR counterpart also brightened following the 2007 event. We discuss our findings in the context of the magnetar and other models.

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