Infrared AKARI observations of magnetars 4U 0142+61 and 1E 2259+586
Infrared AKARI observations of magnetars 4U 0142+61 and 1E 2259+586
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磁星 4U 0142 61 和 1E 2259 586 的红外 AKARI 观测
DOI：
10.1017/s1743921312024362
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
et al.
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文献类型：
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作者：
T. Kohmura;et al.
利用日本AKARI红外卫星对4U 0142+61和1 E2259 +568两颗磁星进行了2-4 μm波段的时变观测。我们在4μm波段显著检测到4U 0142 +61，并确定了其他两个波段的通量上限。我们没有在任何条带中检测到1 E 2259+586，并确定了上限。与2005年Spitzer的观测结果相比，4U 0142+61在4μm波段的通量降低了64%。我们解释这种时间变化在红外波段作为一个增加的内半径的尘埃盘周围的中子星星，在那里增加是由于升华的尘埃由大耀斑的中子星星本身。
We observed two magnetars, 4U 0142+61 and 1E2259+568, with the Japanese infrared satellite AKARI to search for the time variability at wavelengths between 2-4 μm. We significantly detected 4U0142+61 in the 4μm band, and determined flux upper limits in the other two bands. We did not detect 1E 2259+586 in any of the bands, and determined upper limits. Comparing the detection of 4U 0142+61 in the 4μm band with the Spitzer observation from 2005, we found the flux was reduced to be 64%. We interpret this time variability in the infrared band as an increase of the inner radius of the dust disk around the neutron star, where the increase is due to the sublimation of the dust by the large flare of neutron star itself.