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arXiv 0711.0190astro-ph
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异常X射线脉冲星4U 0142+61中红外辐射通量变化的研究

Search for Mid-IR Flux Variations from The Anomalous X-ray Pulsar 4U 0142+61

Z. Wang, V. M. Kaspi

摘要:

我们报告我们的斯皮策观测的异常X射线脉冲星4U 0142+61,以下的大X射线爆发,发生在2007年2月7日。为了寻找中红外通量的变化,从2月14日至21日,用红外阵列相机在4.5和8.0 $μ$ m处进行了四次成像观测。没有检测到显着的通量变化,平均通量为4.5 $μ$ m处的32.1 $\pm$ 2.0 $μ$ Jy和8.0 $μ$ m处的59.8 $\pm8.5$ $μ$ Jy,与2005年获得的结果一致。没有检测到的变化是有趣的,根据报道的快速变化,从这个来源在近红外线,但一致的事实,即源已经回到了它的静止状态之前,我们的观察开始,由同期的X射线观测表明。为了了解近红外变化的起源,需要频繁的同时进行多波长观测。

英文摘要:

We report on our Spitzer observations of the anomalous X-ray pulsar 4U 0142+61, made following a large X-ray burst that occurred on 2007 February 7. To search for mid-infrared flux variations, four imaging observations were carried out at 4.5 and 8.0 $μ$m with the Infrared Array Camera from February 14 to 21. No significant flux variations were detected, and the average fluxes were 32.1$\pm$2.0 $μ$Jy at 4.5 $μ$m and 59.8$\pm8.5$ $μ$Jy at 8.0 $μ$m, consistent with those obtained in 2005. The non-detection of variability is interesting in light of reported rapid variability from this source in the near-infrared, but consistent with the fact that the source already went back to its quiescent state before our observations began, as indicated by contemporaneous X-ray observations. In order to understand the origin of the near-infrared variability, frequent, simultaneous multi-wavelength observations are needed.

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