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arXiv 1607.03293astro-ph.HE
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用INTEGRAL观测到的V 0332+53的两次大爆发

Two giant outbursts of V 0332+53 observed with INTEGRAL

C. Ferrigno, L. Ducci, E. Bozzo, P. Kretschmar, M. Kühnel, C. Malacaria, K. Pottschmidt, A. Santangelo, V. Savchenko, J. Wilms

摘要:

2015年7月,高质量X射线双星V 0332+53经历了一次巨大的爆发,距离上一次爆发已经过去了十年。这个系统拥有一颗强磁化的中子星。在2004- 2005年爆发期间,观测到了其基本回旋共振散射特征(CRSFs)的质心能量与X射线光度之间的反相关。2015年的长($\approx 100$ d)和亮($L_{\rm x} \approx 10^{38}$ erg s $^{-1}$)爆发提供了在另一次爆发期间研究基本CRSF的独特性质及其对X射线光度的依赖性的机会。INTEGRAL卫星对$\sim 330$ ks进行了观测。我们利用光谱分辨率在高能量的SPectrometer积分(SPI)和联合欧洲X射线衍射仪来表征其光谱特性,特别是集中在CRSF光度依赖。我们将2015年爆发的数据与SPI在2004- 2005年收集的数据进行了补充,迄今为止尚未发表。我们发现一个非常显着的反相关的质心能量的基本CRSF和$3-100$ keV光度的$E_1 \propto -0.095(8)L_{37}$ keV。两次爆发都观察到这种趋势。我们证实了基本CRSF的宽度和X射线光度之间的相关性,以前发现的JEM-X和IBIS数据集的2004- 2005年爆发。通过利用RXTE/ASM和雨燕/BAT监测数据,我们还报告了一个$\sim 34$ d调制叠加在平均配置文件和大致一致的脉冲星的轨道周期的检测。我们讨论这种变化的可能解释。

英文摘要:

In July 2015, the high-mass X-ray binary V 0332+53 underwent a giant outburst, a decade after the previous one. This system hosts a strongly magnetized neutron star. During the 2004--2005 outburst, an anti-correlation between the centroid energy of its fundamental cyclotron resonance scattering features (CRSFs) and the X-ray luminosity was observed. The long ($\approx 100$ d) and bright ($L_{\rm x} \approx 10^{38}$ erg s$^{-1}$) 2015 outburst offered the opportunity to study during another outburst the unique properties of the fundamental CRSF and its dependence on the X-ray luminosity. The source was observed by the INTEGRAL satellite for $\sim 330$ ks. We exploit the spectral resolution at high energies of the SPectrometer on INTEGRAL (SPI) and the Joint European X-ray Monitors to characterize its spectral properties, focusing in particular on the CRSF-luminosity dependence. We complement the data of the 2015 outburst with those collected by SPI in 2004--2005 and left unpublished so far. We find a highly significant anti-correlation of the centroid energy of the fundamental CRSF and the $3-100$ keV luminosity of $E_1 \propto -0.095(8)L_{37}$ keV. This trend is observed for both outbursts. We confirm the correlation between the width of the fundamental CRSF and the X-ray luminosity previously found in the JEM-X and IBIS dataset of the 2004--2005 outburst. By exploiting the RXTE/ASM and Swift/BAT monitoring data we also report on the detection of a $\sim 34$ d modulation superimposed on the mean profiles and roughly consistent with the orbital period of the pulsar. We discuss possible interpretations of such variability.

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