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arXiv 0704.3682astro-ph
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IGR J16194-2810:一个新的共生X射线双星

IGR J16194-2810: a new symbiotic X-ray binary

N. Masetti, R. Landi, M. L. Pretorius, V. Sguera, A. J. Bird, M. Perri, P. A. Charles, J. A. Kennea, A. Malizia, P. Ubertini

摘要:

本文报道了对X射线源IGR J 16194 -2810的多波长研究,它是一个新的共生X射线双星(SyXB),即由一个M型巨星和一个致密天体组成的罕见类型的低质量X射线双星(LMXB)。利用雨燕/XRT数据所允许的精确X射线位置,我们精确地定位了光学对应物,一颗M2 III恒星。此外,XRT和INTEGRAL/IBIS提供的光谱信息的组合使用表明,该源的0.5-200 keV光谱可以用吸收康普顿化模型来描述,通常在LMXB中发现,特别是在SyXB中。在IBIS数据中没有检测到长期(几天到几个月)的周期性。由XRT提供的时间范围揭示了典型的银河系X射线源吸积的散粒噪声的变化,但还不足以详细探索X射线短期(秒至小时)振荡的存在。通过使用上述信息,我们推断这个源的重要参数,如它的距离(约3.7千秒差距)和X射线光度(约1.4e35 erg/s,在0.5-200 keV波段),我们给这个系统(典型的SyXB),其中一个紧凑的对象(可能是一个中子星)从它的M-型巨星伴星的风吸积的描述。我们还绘制了IGR J16194-2810和属于这个子类的其他源之间的一些比较,发现这个对象类似于SyXB 4U 1700+24和4U 1954+31。

英文摘要:

We here report on the multiwavelength study which led us to the identification of X-ray source IGR J16194-2810 as a new Symbiotic X-ray Binary (SyXB), that is, a rare type of Low Mass X-ray Binary (LMXB) composed of a M-type giant and a compact object. Using the accurate X-ray position allowed by Swift/XRT data, we pinpointed the optical counterpart, a M2 III star. Besides, the combined use of the spectral information afforded by XRT and INTEGRAL/IBIS shows that the 0.5-200 keV spectrum of this source can be described with an absorbed Comptonization model, usually found in LMXBs and, in particular, in SyXBs. No long-term (days to months) periodicities are detected in the IBIS data. The time coverage afforded by XRT reveals shot-noise variability typical of accreting Galactic X-ray sources, but is not good enough to explore the presence of X-ray short-term (seconds to hours) oscillations in detail. By using the above information, we infer important parameters for this source such as its distance (about 3.7 kpc) and X-ray luminosity (about 1.4e35 erg/s in the 0.5-200 keV band), and we give a description for this system (typical of SyXBs) in which a compact object (possibly a neutron star) accretes from the wind of its M-type giant companion. We also draw some comparisons between IGR J16194-2810 and other sources belonging to this subclass, finding that this object resembles SyXBs 4U 1700+24 and 4U 1954+31.

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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