SMSS J130522 .47-293113.0：一个高纬度恒星X射线源和pc尺度的外流遗迹？
SMSS J130522.47-293113.0: a high-latitude stellar X-ray source with pc-scale outflow relics?
摘要：
我们发现了一个不寻常的恒星系统SMSS J130522.47-293113.0。光谱由蓝色连续谱以及氢、中性和电离氦的发射线以及在约4640-4650埃处的N III、C III混合物主导。发射线轮廓在短至1天的时间尺度上在强度和位置上变化，而光学光度测量显示在短至10-15分钟的时间尺度上的波动高达~0.2 mag。该系统是弱X射线源（f_{0.3-10} =（1.2 +/- 0.1）x 10^{-13}尔格cm^{-2} s^{-1}，在0.3-10 keV波段），但在无线电波长（3-sigma上限为50 microJy，5.5 GHz）处未检测到。然而，该系统最有趣的特性是存在两个“斑点”，大小为几个角秒，对称地位于中心物体两侧的3.8弧分（2.2 pc，我们首选的系统距离为~2 kpc）。在光学和近红外宽带图像中检测到斑点，但在Halpha图像中没有显示任何过量发射。我们讨论了系统的解释，这表明中心对象是最有可能的新星样CV，和斑点的遗迹PC规模的吸积动力准直流出。
英文摘要：
We report the discovery of an unusual stellar system, SMSS J130522.47-293113.0. The optical spectrum is dominated by a blue continuum together with emission lines of hydrogen, neutral and ionized helium, and the N III, C III blend at around 4640-4650 Angstrom. The emission line profiles vary in strength and position on timescales as short as 1 day, while optical photometry reveals fluctuations of as much as ~0.2 mag in g on timescales as short as 10-15 min. The system is a weak X-ray source (f_{0.3-10} = (1.2 +/- 0.1) x 10^{-13} ergs cm^{-2} s^{-1} in the 0.3-10 keV band) but is not detected at radio wavelengths (3-sigma upper limit of 50 microJy at 5.5 GHz). The most intriguing property of the system, however, is the existence of two "blobs", a few arcsec in size, that are symmetrically located 3.8 arcmin (2.2 pc for our preferred system distance of ~2 kpc) each side of the central object. The blobs are detected in optical and near-IR broadband images but do not show any excess emission in Halpha images. We discuss the interpretation of the system, suggesting that the central object is most likely a nova-like CV, and that the blobs are relics of a pc-scale accretion-powered collimated outflow.
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