通过IR光谱揭示六种HMXB的性质
Unveiling the nature of six HMXBs through IR spectroscopy
摘要：
国际伽玛射线天体物理实验室（INTEGRAL）正在发现大量新的硬X射线源，其中许多是HMXB。它们的光学/红外对应物的识别和光谱表征是对这些系统进行详细研究的必要步骤。特别是，光谱类型的确定是至关重要的情况下，新类的超巨星快速X射线瞬变（SFXTs），这表明X射线属性共同的其他对象。我们使用ESO/NTT SofI光谱仪观察HMXB的红外对应物，获得Ks中等分辨率光谱（R = 1320），S/N >= 100。我们通过与出版的地图集进行比较，对它们进行了分类。我们可以对六个来源进行光谱分类。这使我们能够将其中一个归因于SFXTs的新类别，并确认两个源的成员资格。我们证实了光谱分类，来自光谱学，一个已知的系统，4U 1907-09，首次显示其红外光谱。光谱分类还用于估计源的距离。我们比较了消光来自X射线数据与有效的星际消光从我们的数据，讨论了由于拱星环境，我们在四个系统中观察到的吸收分量;特别是，内在吸收似乎成为一类SFXTs的典型特征。
英文摘要：
The International Gamma-Ray Astrophyiscs Laboratory (INTEGRAL) is discovering a large number of new hard X-ray sources, many of them being HMXBs. The identification and spectral characterization of their optical/infrared counterparts is a necessary step to undertake detailed study of these systems. In particular, the determination of the spectral type is crucial in the case of the new class of Supergiant Fast X-ray Transients (SFXTs), which show X-ray properties common to other objects. We used the ESO/NTT SofI spectrograph to observe proposed IR counterparts to HMXBs, obtaining Ks medium resolution spectra (R = 1320) with a S/N >= 100. We classified them through comparison with published atlases. We were able to spectrally classify the six sources. This allowed us to ascribe one of them to the new class of SFXTs and confirm the membership of two sources to this class. We confirmed the spectral classification, derived from optical spectroscopy, of a known system, 4U 1907-09, showing for the first time its infrared spectrum. The spectral classification was also used to estimate the distance of the sources. We compared the extinction as derived from X-ray data with effective interstellar extinction obtained from our data, discussing the absorption component due to the circumstellar environment, which we observed in four systems; in particular, intrinsic absorption seems to emerge as a typical feature of the entire class of SFXTs.
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