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arXiv 1303.2340astro-ph.HE
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SWIFT J1729的RXTE和SWIFT观察结果9 -3437

RXTE and SWIFT Observations of SWIFT J1729.9-3437

S. Sahiner, S. C. Inam, M. M. Serim, A. Baykal

摘要:

我们分析了2010年7月20日至2010年8月12日SWIFT J1729.9 $-$ 3437爆发后的\emph{RXTE}和\emph{Swift}观测结果。我们从脉冲到达时间的二次拟合计算自旋频率和自旋频率导数分别为$1.8734(8) \times 10^{-3}$ Hz和$6.42(6) \times 10^{-12}$ Hz/s。二次拟合残差与周期为$15.3(2)$天、质量函数约为$1.3M_{\odot}$的圆形轨道模型拟合良好,但它们也可以用$6.8 \times 10^{-18}$ Hz sec $^{-2}$的扭矩噪声强度来解释。随着源通量的不断减小,脉冲轮廓从双峰转变为单峰。我们发现,脉冲形状一般没有表现出很强的能量依赖性。硬度比表明,随着流量的减少,源变得更软。我们从所有可用的RXTE和Swift观测中构建了一个单一的光谱。我们发现,添加一个\emph{Fe}线复杂的功能,6.51千电子伏左右的光谱拟合略有改善,这一功能更有可能起源于源,而不是银河系的山脊。脉冲相位谱分析表明,随着脉冲相位的变化,高能截止光子的折射率和折叠能量也随之变化。

英文摘要:

We analyze \emph{RXTE} and \emph{Swift} observations of SWIFT J1729.9$-$3437 after its outburst from 2010 July 20 to 2010 August 12. We calculate a spin frequency and spin frequency derivative of $1.8734(8) \times 10^{-3}$ Hz and $6.42(6) \times 10^{-12}$ Hz/s respectively from the quadratic fit of pulse arrival times. The quadratic fit residuals fit well to a circular orbital model with a period of $15.3(2)$ days and a mass function of about $1.3M_{\odot}$, but they can also be explained by a torque noise strength of $6.8 \times 10^{-18}$ Hz sec$^{-2}$. Pulse profiles switches from double-peaked to single-peaked as the source flux continues to decrease. We find that the pulse shape generally shows no strong energy dependence. The hardness ratios reveal that the source becomes softer with decreasing flux. We construct a single spectrum from all the available RXTE and Swift observations. We find that adding an \emph{Fe} line complex feature around 6.51 keV slightly improves the spectral fit and that this feature is more likely to originate from the source rather than the Galactic ridge. From the pulse phase spectral analysis, it is shown that that photon index and folding energy of the high energy cut-off vary with varying pulse phase.

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