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arXiv 1607.03326astro-ph.HE
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超巨星快X射线瞬变IGR J16328-4726的XMM Newton和INTEGRAL观测

The XMM Newton and INTEGRAL observations of the supergiant fast X-ray transient IGR J16328-4726

M. Fiocchi, A. Bazzano, L. Natalucci, P. Ubertini, V. Sguera, A. J. Bird, C. M. Boon, P. Persi, L. Piro

摘要:

从超巨星快速X射线瞬变(SFXT)观测到的产生短耀斑的吸积机制仍然存在很大争议,这是我们试图将这些X射线双星置于更广泛的大质量X射线双星背景下的一个主要部分。我们报告了SFXT IGR J16328-4726(2014年8月24日至27日)的216 ks积分观测,同时在假定的近星通过附近进行了两次XMM牛顿(33 ks和20 ks)的固定时间观测,以研究吸积状态和风特性。在这些观测中,该源显示出光度变化,从4x 10 ^{34} erg/s到10^{36} erg/s,与光谱特性的变化有关。软X射线连续谱可以很好地用幂律来模拟,光子指数从1.2变化到1.7,柱密度的高值在2- 4 × 10 ^{23}/cm ^2的范围内。我们报告的存在下,在6.8-7.1千电子伏的铁线表明,X射线通量是由吸积的物质,其特征在于密度和温度的不均匀性的同伴风。

英文摘要:

The accretion mechanism producing the short flares observed from the Supergiant Fast X-ray Transients (SFXT) is still highly debated and forms a major part in our attempts to place these X-ray binaries in the wider context of the High Mass X-ray Binaries. We report on a 216 ks INTEGRAL observation of the SFXT IGR J16328-4726 (August 24-27, 2014) simultaneous with two fixed-time observations with XMM Newton (33ks and 20ks) performed around the putative periastron passage, in order to investigate the accretion regime and the wind properties during this orbital phase. During these observations, the source has shown luminosity variations, from 4x10^{34} erg/s to 10^{36} erg/s, linked to spectral properties changes. The soft X-ray continuum is well modeled by a power law with a photon index varying from 1.2 up to 1.7 and with high values of the column density in the range 2-4x10^{23}/cm^2. We report on the presence of iron lines at 6.8-7.1 keV suggesting that the X-ray flux is produced by accretion of matter from the companion wind characterized by density and temperature inhomogeneities.

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