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arXiv 1111.3299astro-ph.HE
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1A 1118-61与Suzaku的定时和宽带光谱

Timing and broad band spectroscopy of 1A 1118-61 with Suzaku

Chandreyee Maitra, Biswajit Paul, Sachindra Naik

摘要:

本文利用朱雀星观测资料对2009年1月爆发期间观测到的瞬变Be X射线脉冲双星1A 1118-61进行了定时和宽带脉冲相位分辨光谱分析。朱雀观测了两次,一次在爆发的高峰期,一次在13天后的下降阶段。两次观测的脉冲轮廓都表现出强烈的能量依赖性,在低能量有几个峰,在10 keV以上有一个单峰。一个弱的,窄的峰值检测到的脉冲轮廓从两个观察的能量带低于3千电子伏的主倾角,表明存在的相位相关的软过剩的源连续。脉冲星的宽带能谱可以用部分覆盖截断的幂律模型和窄的铁荧光谱线进行很好的拟合。我们还检测到一个广泛的回旋特征在~50千电子伏,从这两个观测,这是一个功能常见的吸积供电的高磁场强度的恒星。脉冲相位分辨光谱分析显示部分覆盖分量的吸收柱密度的增加,以及在脉冲轮廓的倾角处的覆盖分数的变化,这自然解释了相同的能量依赖性。的回旋加速器线参数也显示出显着的变化与脉冲相位的回旋加速器线能量的变化和深度的变化的3倍~ 10 keV。这可以解释为在不同脉冲相位下偶极场的不同视角的效应,或者更复杂的潜在磁场几何形状

英文摘要:

We present a timing and broad-band pulse phase resolved spectral analysis of the transient Be X-ray binary pulsar 1A 1118-61 observed during its outburst in January 2009 using Suzaku observations. Suzaku observations were made twice, once at the peak of the outburst, and once 13 days later at its declining phase.Pulse profiles from both observations exhibit strong energy dependence with several peaks at low energies and a single peak above ~10 keV. A weak, narrow peak is detected at the main dip of the pulse profiles from both observations in the energy bands below 3 keV, indicating the presence of a phase dependent soft excess in the source continuum. The broad-band energy spectrum of the pulsar could be fitted well with a partial covering cutoff power-law model and a narrow iron fluorescence line. We also detect a broad cyclotron feature at ~50 keV from both observations which is a feature common for accretion powered pulsars with high magnetic field strengths. Pulse phase-resolved spectral analysis shows an increase in the absorption column density of the partial covering component, as well as variation in the covering fraction at the dips of the pulse profiles, that naturally explains the energy dependence of the same. The cyclotron line parameters also show significant variation with pulse phase with a ~ 10 keV variation in the cyclotron line energy and a variation in depth by a factor of three. This can be explained either as the effect of different viewing angles of the dipole field at different pulse phases, or a more complex underlying magnetic field geometry

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