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arXiv 1306.4597astro-ph.HE
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2XMM J191043 .4+091629.4的红外鉴别

Infrared identification of 2XMM J191043.4+091629.4

J. J. Rodes Roca, J. M. Torrejón, S. Martínez-Núñez, G. Bernabéu, A. Magazzú

摘要:

在这里,我们报告的X射线源2XMM J191043.4+091629.4的红外识别,这是由XMM-牛顿/EPIC在银河系超新星遗迹W 49 B附近检测到的。这项工作的目的是建立X射线源2XMM J191043.4+091629.4的性质,研究伴星的红外测光和光谱学。我们分析UKIDSS图像周围的最佳位置的X射线源,并获得光谱的最佳候选人使用NICS在3.5米TNG望远镜。我们提出了光度和光谱TNG分析的红外对应的X射线源识别发射线在K波段。H带光谱没有呈现任何显著特征。我们已经表明,在2.165微米处的Brackett γ H I和在2.184微米和2.058微米处的He I在红外光谱中显著存在。我们的光谱中也没有CO带。根据这些结果和源的X射线特征,我们得出结论,红外对应物是一个早期B型超巨星,E(B-V)= 7.6 +/- 0.3,距离16.0 +/- 0.5 kpc。因此,这将是第一个在银河系外臂30度到60度之间的高质量X射线双星。

英文摘要:

Here we report the infrared identification of the X-ray source 2XMM J191043.4+091629.4, which was detected by XMM-Newton/EPIC in the vicinity of the Galactic supernova remnant W49B. The aim of this work is to establish the nature of the X-ray source 2XMM J191043.4+091629.4 studying both the infrared photometry and spectroscopy of the companion. We analyse UKIDSS images around the best position of the X-ray source, and obtain spectra of the best candidate using NICS in the 3.5 m TNG telescope. We present both photometric and spectroscopic TNG analysis of the infrared counterpart of the X-ray source identifying emission lines in the K-band. H-band spectra does not present any significant feature. We have showed that Brackett gamma H I, at 2.165 micrometre, and He I, at 2.184 micrometre and at 2.058 micrometre, are present significantly in the infrared spectrum. The CO bands are also not present in our spectrum. Based on these results and the X-ray characteristics of the source we conclude that the infrared counterpart is an early B-type supergiant star with an E(B-V)= 7.6 +/- 0.3 at a distance of 16.0 +/- 0.5 kpc. This would be, therefore, the first high-mass X-ray binary in the Outer Arm at galactic longitudes between 30 and 60 degrees.

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