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arXiv 1007.5146astro-ph.HE
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SNR G344 .7-0.1和中心物体CXOU J170357 .8-414302的X射线研究

An X-ray study of the SNR G344.7-0.1 and the central object CXOU J170357.8-414302

J. A. Combi, J. F. Albacete Colombo, J. Lopez-Santiago, G. E. Romero, E. Sanchez-Ayaso, J. Marti, P. L. Luque-Escamilla, P. G. Perez-Gonzalez, A. J. Munoz-Arjon… 展开作者

J. A. Combi, J. F. Albacete Colombo, J. Lopez-Santiago, G. E. Romero, E. Sanchez-Ayaso, J. Marti, P. L. Luque-Escamilla, P. G. Perez-Gonzalez, A. J. Munoz-Arjonilla, J. R. Sanchez-Sutil

摘要:

目标。本文报道了超新星遗迹G344.7-0.1的X射线研究结果和位于超新星遗迹射电结构几何中心的点状X射线源。方法.利用XMM-牛顿和钱德拉卫星的数据研究了残余物和中心X射线点状源的形态和光谱特性。档案无线电数据和红外斯皮策观测8和24 $μ$米被用来比较和研究其在不同波长的多波段特性。结果XMM-牛顿和钱德拉的观测表明,G344.7-0.1的整体X射线发射被扩展,并与明亮的无线电和红外发射区域非常相关。X射线光谱主要由突出的原子发射线控制。这些特征表明,X射线发射起源于一个薄的热等离子体,其辐射很好地表示了平面平行激波等离子体模型(PSHOCK)。我们的研究倾向于这样一种情况,即G344.7-0.1是一个6 x 10^3年的SNR,在一个高密度梯度的介质中膨胀,并且很可能在西侧遇到一个分子云。此外,我们报告的软点状X射线源位于无线电信噪比结构的几何中心的发现。该天体具有紧凑中心天体(CCO)的某些特征。但其中性氢吸附柱(N_{H})与SNR不一致。与源的位置一致,我们发现了具有典型的早K星特征的红外和光学物体。X射线源可以是前景星或与SNR相关联的CCO。如果后一种可能性得到证实,这个点状源将是迄今为止探测到的最远的CCO,也是新发现的孤立弱磁化中子星中的第八个成员。

英文摘要:

Aims. We report results of an X-ray study of the supernova remnant (SNR) G344.7-0.1 and the point-like X-ray source located at the geometrical center of the SNR radio structure. Methods. The morphology and spectral properties of the remnant and the central X-ray point-like source were studied using data from the XMM-Newton and Chandra satellites. Archival radio data and infrared Spitzer observations at 8 and 24 $μ$m were used to compare and study its multi-band properties at different wavelengths. Results. The XMM-Newton and Chandra observations reveal that the overall X-ray emission of G344.7-0.1 is extended and correlates very well with regions of bright radio and infrared emission. The X-ray spectrum is dominated by prominent atomic emission lines. These characteristics suggest that the X-ray emission originated in a thin thermal plasma, whose radiation is represented well by a plane-parallel shock plasma model (PSHOCK). Our study favors the scenario in which G344.7-0.1 is a 6 x 10^3 year old SNR expanding in a medium with a high density gradient and is most likely encountering a molecular cloud on the western side. In addition, we report the discovery of a soft point-like X-ray source located at the geometrical center of the radio SNR structure. The object presents some characteristics of the so-called compact central objects (CCO). However, its neutral hydrogen absorption column (N_{H}) is inconsistent with that of the SNR. Coincident with the position of the source, we found infrared and optical objects with typical early-K star characteristics. The X-ray source may be a foreground star or the CCO associated with the SNR. If this latter possibility were confirmed, the point-like source would be the farthest CCO detected so far and the eighth member of the new population of isolated and weakly magnetized neutron stars.

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