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arXiv 0810.1878astro-ph
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持久性超紧凑型X射线爆发器的INTEGRAL长期监测

The INTEGRAL long monitoring of persistent Ultra Compact X-ray Bursters

M. Fiocchi, A. Bazzano, P. Ubertini, A. J. Bird, L. Natalucci, V. Sguera

摘要:

超致密X射线双星的致密天体、短周期光变和特殊的化学成分构成了研究中子星表面吸积过程和热核燃烧的一个非常有趣的实验室。改进的大型光学望远镜和更灵敏的X射线卫星增加了已知的超紧凑X射线双星的数量,使其研究具有前所未有的细节。我们分析了INTEGRAL从~0.2keV到~ 150 keV观测到的所有超紧凑爆发器的平均特性。我们已经进行了系统的分析的INTEGRAL的公共数据和关键程序专有的观测样品的超紧凑X射线双星。为了研究它们在非常宽的能带中的平均性质,我们尽可能将INTEGRAL与BeppoSAX和SWIFT数据相结合。对于沿INTEGRAL监测没有显示任何显著通量变化的源,我们通过结合所有可用数据来构建平均光谱;在可变通量的情况下,我们使用同时INTEGRAL和SWIFT观测(如果可用)。另外,我们比较了IBIS和PDS数据,以检查变异性,并将BeppoSAX与INTEGRAL/IBIS数据结合起来。所有的光谱都很好地代表了由一个磁盘黑体和康普顿发射的两个组件模型。这些致密源的大部分时间都处于典型的低/硬态,主要的康普顿化成分和吸积速率低于~10^{-9}Msolar/yr,不依赖于所使用的模型来拟合数据。

英文摘要:

The combination of compact objects, short period variability and peculiar chemical composition of the Ultra Compact X-ray Binaries make up a very interesting laboratory to study accretion processes and thermonuclear burning on the neutron star surface. The improved large optical telescopes and more sensitive X-ray satellites have increased the number of known Ultra Compact X-ray Binaries allowing their study with unprecedented detail. We analyze the average properties common to all ultra compact Bursters observed by INTEGRAL from ~0.2keV to ~150keV. We have performed a systematic analysis of the INTEGRAL public data and Key-Program proprietary observations of a sample of the Ultra Compact X-ray Binaries. In order to study their average properties in a very broad energy band, we combined INTEGRAL with BeppoSAX and SWIFT data whenever possible. For sources not showing any significant flux variations along the INTEGRAL monitoring, we build the average spectrum by combining all available data; in the case of variable fluxes, we use simultaneous INTEGRAL and SWIFT observations when available. Otherwise we compared IBIS and PDS data to check the variability and combine BeppoSAX with INTEGRAL/IBIS data. All spectra are well represented by a two component model consisting of a disk-blackbody and Comptonised emission. The majority of these compact sources spend most of the time in a canonical low/hard state, with dominating Comptonised component and accretion rate lower than ~10^{-9}Msolar/yr, not depending on the used model to fit the data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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