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arXiv 0809.2638astro-ph
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异常X射线脉冲星4U 0142+61的近红外脉动研究

Search for Near-Infrared Pulsation of the Anomalous X-ray Pulsar 4U 0142+61

Mikio Morii, Naoto Kobayashi, Nobuyuki Kawai, Hiroshi Terada, Yasuyuki T. Tanaka, Shunji Kitamoto, Noriaki Shibazaki

摘要:

我们在Subaru 8.2米望远镜上利用IRCS的快速读出模式对K'波段异常X射线脉冲星(AXP)4U 0142+61($λ_{\rm eff} = 2.11$ $μ$ m)的脉动进行了探测。在RXTE的X射线监测观测得到的精密星历所期望的脉冲频率上,我们没有发现明显的信号。尽管如此,我们获得了17%(90%C.L.)的最佳上限。对于K'波段中的均方根脉冲分数。结合i'波段脉动(Dhillon等人,2005),脉冲分量($F_ν\propto ν^α$)的斜率被限制为$α> -0.87$(90%C.L.)$A_{V} = 3.5$的星际灭绝。

英文摘要:

We have searched for pulsation of the anomalous X-ray pulsar (AXP) 4U 0142+61 in the K' band ($λ_{\rm eff} = 2.11$ $μ$m) using the fast-readout mode of IRCS at the Subaru 8.2-m telescope. We found no significant signal at the pulse frequency expected by the precise ephemeris obtained by the X-ray monitoring observation with RXTE. Nonetheless, we obtained a best upper limit of 17% (90% C.L.) for the root-mean-square pulse fraction in the K' band. Combined with i' band pulsation (Dhillon et al. 2005), the slope of the pulsed component ($F_ν\propto ν^α$) was constrained to $α> -0.87$ (90% C.L.) for an interstellar extinction of $A_{V} = 3.5$.

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