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arXiv 1507.00237astro-ph.GA
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银河系中心附近的过剩源DSO/G2:理论与观测

Infrared-excess Source DSO/G2 Near the Galactic Center: Theory vs. Observations

Michal Zajacek, Andreas Eckart, Florian Peissker, Grischa D. Karssen, Vladimir Karas

摘要:

基于2014年和2015年ESO VLT/SINFONI对尘埃S星团天体(DSO/G2)最接近银河系中心超大质量黑洞的监测,我们进一步探索了一颗年轻吸积星的模型,以解释观测到的光谱和形态特征。恒星的情况下,我们的研究结果,即电离氢发射的DSO,保持空间紧凑的前后peribothron通道。DSO/G2天体作为一个紧凑的单峰发射线源的检测与原来的假设不一致,即无核云必然是潮汐拉伸的,因此在近心点通道周围产生双峰发射线轮廓。这加强了DSO/G2源是一颗尘埃笼罩的年轻恒星的证据,似乎处于吸积阶段。从拱星盘到恒星表面的物质的下落可以显着贡献的Br $γ$线的发射以及观察到的大线宽的数量级为10埃。

英文摘要:

Based on the monitoring of the Dusty S-cluster Object (DSO/G2) during its closest approach to the Galactic Center supermassive black hole in 2014 and 2015 with ESO VLT/SINFONI, we further explore the model of a young, accreting star to explain observed spectral and morphological features. The stellar scenario is supported by our findings, i.e. ionized-hydrogen emission from the DSO that remains spatially compact before and after the peribothron passage. The detection of DSO/G2 object as a compact single-peak emission-line source is not consistent with the original hypothesis of a core-less cloud that is necessarily tidally stretched, hence producing a double-peak emission line profile around the pericentre passage. This strengthens the evidence that the DSO/G2 source is a dust-enshrouded young star that appears to be in an accretion phase. The infall of material from the circumstellar disc onto the stellar surface can contribute significantly to the emission of Br$γ$ line as well as the observed large line width of the order of 10 angstrom.

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