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arXiv 0704.2737astro-ph
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瞬态IGR J11321-5311的INTEGRAL高能量检测

INTEGRAL high energy detection of the transient IGR J11321-5311

V. Sguera, A. Bazzano, A. J. Bird, A. B. Hill, A. J. Dean, L. Bassani, A. Malizia, P. Ubertini

备注：
accepted for publication in A&A letter, 4 pages, 6 figures
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摘要：

内容：INTEGRAL于2005年6月在观测Crux旋臂期间发现了瞬态硬X射线源IGR J11321-5311，这是迄今为止X/伽马射线飞行任务报告的唯一探测到该源的情况。目的：通过时间和光谱IBIS分析来表征行为，从而确定源的性质。方法：使用标准INTEGRAL软件OSA v.5.1进行详细的光谱和时间分析。结果：迄今为止，IGR J11321-5311仅检测到一次。它的活动时间约为3.5小时，在IBIS光变曲线中可以看到持续约1.5小时的短暂而明亮的耀斑。它的峰值通量约为80 mCrab或2.2x10E-9 erg cmE-2 sE-1（20- 300 keV），对应的峰值亮度为1.1x10E37 erg sE-1（假设距离为6.5 kpc）。在爆发期间，检测到的源具有18 sigma（20- 300 keV）和8 sigma（100- 300 keV）的重要性。总爆发活动（17- 300 keV）的谱最好用幂律（γ =0.55+/-0.18）加黑体（kT=1.0 + 0.2 - 0.3 keV）的和来拟合，没有证据表明在300 keV以下爆发。在科学窗口水平的光谱分析显示，通过爆发的光谱明显硬化。搜索IBIS数据，以查找脉动，但没有阳性结果。结论：X射线光谱形状和耀斑行为支持IGR J11321-5311是异常X射线脉冲星的假设，尽管在现阶段还不能坚决拒绝不同的性质。

英文摘要：

Context: The transient hard X-ray source IGR J11321-5311 was discovered by INTEGRAL on June 2005, during observations of the Crux spiral arm. To date, this is the only detection of the source to be reported by any X/gamma-ray mission. Aims: To characterize the behaviour and hence the nature of the source through temporal and spectral IBIS analysis. Methods: Detailed spectral and temporal analysis has been performed using standard INTEGRAL software OSA v.5.1. Results: To date, IGR J11321-5311 has been detected only once. It was active for about 3.5 hours, a short and bright flare lasting about 1.5 hours is evident in the IBIS light curve. It reached a peak flux of about 80 mCrab or 2.2x10E-9 erg cmE-2 sE-1 (20--300 keV),corresponding to a peak luminosity of 1.1x10E37 erg sE-1 (assuming a distance of 6.5 kpc). During the outburst, the source was detected with a significance of 18 sigma (20--300 keV) and 8 sigma (100--300 keV). The spectrum of the total outburst activity (17--300 keV) is best fitted by the sum of a power law (Gamma=0.55+/-0.18) plus a black body (kT=1.0{+0.2}_{-0.3} keV), with no evidence for a break up to 300 keV. A spectral analysis at Science Window level revealed an evident hardening of the spectrum through the outburst. The IBIS data were searched for pulsations with no positive result. Conclusions: The X-ray spectral shape and the flaring behaviour favour the hypothesis that IGR J11321-5311 is an Anomalous X-ray Pulsar, though a different nature can not be firmly rejected at the present stage.

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